DJI Agras T100 OEM D14000iE Zongshen Generator Valve Spring Upgrade (YC.DZ.GR000245)

DJI Agras T100 OEM D14000iE Zongshen Generator Valve Spring Upgrade (YC.DZ.GR000245) — the upgraded valve spring that returns the valve to its seat and controls valve motion in the DJI Agras Zongshen generator engine, DJI material number YC.DZ.GR000245. DJI generator valve spring, upgraded valve spring, DJI Agras OEM valve train.

🇺🇸 U.S.A. FIRST

Ares Acres LLC is a U.S.-based authorized DJI Agras reseller supporting American agricultural drone operators with genuine DJI Agras OEM replacement parts, accessories, and field-ready inventory.

FREE & FAST Shipping is included for all U.S. customers.

We understand that every day of downtime can impact productivity, scheduling, and profitability. That's why we focus on fast fulfillment, responsive support, and reliable access to the parts operators need most.

We use specialized technicians to verify and dispatch the D14000iE Zongshen Generator Valve Spring Upgrade ordered.

Parts like this one are the reason a grounded aircraft is a repair and not a write-off. A single component held in U.S. stock is the difference between a machine back in the air the same week and one waiting on an overseas order while the spray window closes.

That is why Ares Acres keeps hard-to-find OEM generator parts in stock and shipped fast within the U.S.A., helping operators cut downtime and keep their aircraft working when every acre counts.

For professional farmers, aerial applicators, and commercial drone operators running the DJI Agras D14000iE / DJI Agras T70P, this is the part that keeps a scheduled job on the calendar instead of on hold.

Ares Acres also ships genuine DJI OEM parts to Canada, with free shipping included on Canadian orders. Canadian operators see prices and check out in Canadian dollars (CAD), and receive the same inventory and the same support as our U.S. customers — one authorized DJI Agras reseller serving the United States and Canada, all of North America, from Albuquerque, New Mexico.

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✅ DJI Agras Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• DJI material number YC.DZ.GR000245 — verified against the official DJI Agras generator parts list
• Supplier-listed fitment: DJI Agras D14000iE generator (T100 / T70P), Zongshen engine
• Brand new condition — never installed, never run

📦 Package Includes

• 1 × Generator Valve Spring (Upgrade) (YC.DZ.GR000245)

🔧 Component Overview

The DJI Agras OEM Generator Valve Spring (Upgrade), DJI material number YC.DZ.GR000245, returns the valve to its seat and controls valve motion in the Zongshen engine shared across the D12000iE and D14000iE generators — an upgraded-spec spring for improved durability.

Prove the spring is the problem before the head comes off, because most of what a weak valve spring does can also be done by a burnt valve, a tight valve clearance, or a worn seat. Start with a compression test on a warm engine, then follow it with a leak-down test, which is the one that tells you where the air is actually going. Air hissing out of the intake means the intake valve is not sealing; out of the exhaust means the exhaust valve; out of the crankcase means rings, and no spring will fix that.

Pay attention to when the fault appears. A valve spring that has lost tension usually behaves at idle and light load and falls apart when the engine is asked to work, because valve float is a function of speed and spring force rather than of fuel or spark. A generator that starts fine, idles fine, then will not hold output when the load comes on, or that loses its top end and gets louder doing it, fits that pattern. A fault that is equally bad hot, cold, loaded, and unloaded usually is not a spring.

Compare the removed spring against the new one directly. This is the measurement that matters and it needs no published figure: stand the old spring and the new one side by side on a flat surface and look at the difference in free length. A spring that has taken a set from heat and hours is visibly shorter, and shorter free length means lower seat pressure, which means a valve that no longer closes hard enough to seal or fast enough to follow the cam.

Check the old spring for squareness and for a crack while you have it out. Stand it on a flat plate against a square: a spring that leans has been loading the retainer and the guide unevenly the whole time it has been in there. Then look closely at the end coils and at the coil-to-coil contact areas, which is where fatigue cracks start. A spring can be cracked and still hold the valve closed, so a break is easy to miss unless you take the spring off and look at it in your hand.

Look at what the rest of the valve train is telling you before you commit. With the rocker cover off and the engine cold, check the valve clearance against the setting in your service documentation for this engine, because a clearance that has closed up mimics a weak spring by holding the valve off its seat. Then look at the top of the valve stem, the rocker face, and the retainer for bright fretting or a stepped wear pattern, which says the valve train has been bouncing rather than following.

Do not diagnose this from a symptom alone if the engine has been overheating. Blocked cooling fins, a damaged cooling fan, a missing or misfitted shroud, or a generator run in a corner with no airflow will cook a valve spring, and the same heat burns valves and cooks oil. Where the engine has a heat history, plan on inspecting the valve, the seat, and the guide at the same time rather than expecting a spring on its own to restore what has already been lost.

⚙️ Functional Purpose

The spring closes the valve and controls float. A weak or broken valve spring causes valve float, lost top-end power, and can allow valve-to-piston contact.

Work on a cold engine and isolate it properly first. Let the generator cool right down, shut off the fuel, disconnect the battery and the starting circuit, and pull the spark plug so nothing can fire while your hands are in the valve train. A generator engine that turns over while a spring compressor is on it does serious damage in a fraction of a second, and it takes almost no time to make that impossible.

Bring the cylinder to top dead center on the compression stroke before anything comes apart. That puts both valves closed and puts the piston as close to them as it will be, so a valve that is released cannot drop far into the cylinder. Many technicians also feed a soft rope through the plug hole, or hold the cylinder on compressed air, for the same reason. Do not skip this; a valve dropped into the bore turns a spring job into a head-off job.

Take the rocker cover off cleanly and keep the gasket. Note how everything sits before it moves: the position and orientation of the rocker arms, the pushrods where the engine uses them, and any shims or pivot hardware. Lay parts out in the order and orientation they came off in. Valve train components wear into each other, and putting a rocker back on the other valve, or a pushrod into the other position, introduces a wear mismatch that was not there before.

Compress the spring squarely and expect the keepers to fight you. The two small collets that lock the retainer to the valve stem are the part of this job that goes wrong. They are tiny, they are usually oily, and they leave the bench at speed if they escape. Work over a tray or a rag, use a magnetic pickup, and never use more compression than you actually need, because compressing a spring toward coil bind to get at the keepers damages the very part you are fitting.

Note the orientation of the spring before it comes off. Springs are often wound with tighter coils or a damper at one end, and that end has a designated direction, normally toward the cylinder head. Fitting one upside down changes how it behaves and how the retainer sits against it. Photograph it in place before you release it rather than trusting your memory, because a spring out of the engine can look symmetrical when it is not.

Replace the valve stem seal while the spring is off, and inspect what is underneath it. The seal is right there, it costs very little, and it has been hardened by exactly the same heat that sacked the spring. While you are in there, rock the valve in its guide and feel for side play, look at the stem for a wear step or scoring, and look at the seating face for pitting or a burnt edge. Those are the parts that decide whether a new spring cures anything at all.

Refit the retainer and keepers deliberately, then prove they are home. Seat both collets fully in the stem groove before the compressor comes off, release the spring slowly while watching that they stay put, then tap the top of the valve gently and confirm nothing shifts. Keepers seated on one side only look correct and let go later, which throws a valve into a running engine. When the springs are done, reset the valve clearance to the figure in your service documentation before the cover goes back on.

⚠️ Common Replacement Indicators

• Valve float at higher rpm
• Power loss up top
• Broken, sacked, or weakened spring
• Valve-train noise
• Erratic running

Confirm before you order: this part is DJI number YC.DZ.GR000245, listed for DJI Agras D14000iE generator (T100 / T70P), Zongshen engine. Match it to your parts diagram or the label on your existing part before ordering.

The generator will not hold output under load but seems fine unloaded. Valve float and a valve that does not seal both cost cylinder pressure exactly when the engine is working hardest. If the engine sounds healthy at no load and goes rough and weak the moment load comes on, the valve train is a better suspect than the fuel system, which usually misbehaves in the other direction.

Popping or spitting back through the intake or a sharp crack in the exhaust. An intake valve held open, or bounced open, lets combustion push back where it should not go, and the same thing on the exhaust side reports through the muffler. That is a mechanical timing and sealing symptom rather than a fueling one, and a spring that no longer closes the valve firmly is one of the direct causes.

Hard starting when everything else checks out. A valve that is not seating fully bleeds off cranking compression, and a cold engine turning slowly has the least margin of all. If spark, fuel, and the enrichment system are all good, and the engine cranks with noticeably less resistance than it used to, that is lost compression and the valve train is where to look next.

New or changing noise from the top of the engine. A valve train that is bouncing rather than following the cam is louder than one under control, and the noise changes with speed and load rather than staying constant. A distinct tick that appears under load, or a rattle that comes in above a certain speed and disappears below it, is a different symptom from the steady tick of a wide valve clearance.

A spring that is visibly shorter than the new one when the two are stood side by side. That is a confirmation rather than a symptom, but it is the one that settles the argument. Heat and hours make a spring take a set, and a spring that has lost free length has lost seat pressure whether or not the engine has started complaining. On a continuous-duty generator with real hours on it, expect to find this.

A broken spring found during other work. Breaks most often occur at or near an end coil, and a broken spring can still hold the valve closed well enough that the engine runs, so they are regularly discovered by accident. Once you find one, look hard at the rest of the springs in the engine: they are the same age, were made at the same time, and have run in the same heat.

📐 Specifications

DJI Material Number: YC.DZ.GR000245

Part: Generator Valve Spring (Upgrade)

Fits: DJI Agras D14000iE generator (T100 / T70P), Zongshen engine (supplier-listed fitment)

Engine: Zongshen

Quantity: 1

Condition: Brand new

Part Function: Valve spring. Closes the valve and keeps the valve train following the cam in the Zongshen generator engine.

Specification Level: Upgraded-spec spring, listed by DJI under this material number

Engine Application: The Zongshen engine shared across the D12000iE and D14000iE generators. Listed fitment for this item is DJI Agras D14000iE, on T100 and T70P.

Free Length And Seat Pressure: Not published by DJI. Do not work to a figure taken from another engine. Compare the new spring directly against the one you removed and against the other springs from the same engine, stood side by side on a flat surface.

Quantity Considerations: This listing supplies one spring. An engine contains more than one, and springs age together, so decide before you order whether you are replacing one or the whole set.

Valve Clearance And Torque Figures: Not published in this listing. Use the values in the service documentation for your generator engine. Valve clearance has to be reset after any valve train work, and it is not something to guess at.

Not Supplied With This Part: Valve stem seals, keepers, retainers, spring seats, gaskets, and the valve itself are separate items. Work out what you will need and have it on hand before you open the engine rather than after.

🧰 Fitment Verification Before You Order

This listing is DJI material number YC.DZ.GR000245. That number, not the description, is what makes a part match. Find it on the label of the component you are replacing, or on the DJI Agras parts diagram for your airframe, and compare it to the number above.

Revision suffixes are still the same part. DJI labels sometimes carry a trailing revision such as .01, .02, or .F. Those denote a production revision, not a different component. Match the base number and disregard the suffix.

Visually similar is not the same. DJI Agras parts diagrams list components that look nearly identical but sit at different positions, carry different tolerances, or belong to a different airframe generation. Ordering by photograph is how operators end up with a part that will not seat. Order by number.

Verified fitment for this listing: DJI Agras D14000iE / DJI Agras T70P. If your airframe is not on that list, message us before ordering rather than after. We would rather answer a question than process a return, and so would you.

Not sure? Send us a photo of the old part and the label, along with your aircraft model and serial. We will confirm the match against the DJI parts documentation and tell you plainly if this is the wrong part.

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🛠️ Installation & Handling Notes

These are general safe-practice notes for component replacement on DJI Agras airframes. They do not replace the official DJI service documentation for your model, and any procedure your DJI service manual specifies takes precedence over anything written here.

Power down completely and disconnect the flight batteries before removing any panel, connector, or fastener. Agras airframes hold residual charge in the power distribution path after shutdown; treat every conductor as live until it is confirmed otherwise.

Photograph the assembly before you disturb it. Cable routing, connector orientation, and fastener lengths on Agras airframes are not interchangeable, and the D14000iE Zongshen Generator Valve Spring Upgrade is easier to fit correctly when you can see how the original sat.

Torque to DJI specification. Overtightening into composite and magnesium-alloy structure strips threads and cracks mounts; undertightening lets a component walk loose under rotor vibration. Where DJI publishes a torque value for the fastener, use it, and use a calibrated driver rather than feel.

Check the mating surfaces and seals while you are in there. A component is only as good as what it seats against. Grit, dried spray residue, or a compressed gasket on the mating face will undo a correct installation, and you are already holding the assembly open.

Test before you spray. Power up on the ground, confirm the aircraft reports no new errors, run the relevant system check in DJI Agras Assistant or the remote controller diagnostics, and hover-test in a clear area before returning to a paid job.

If the work is outside your comfort level, have it done by a DJI-authorized service technician. The part cost is small next to the airframe.

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🚜 Necessary For

• Restoring proper valve control
• Top-end / valve service
• Upgrading a weak or broken spring
• Valve-clearance service

Any valve job on the Zongshen generator engine, where the springs are already off and renewing them costs almost nothing in labour compared with going back in later. The spring is the cheapest thing in the head and the most expensive one to have to return for.

Curing a generator that runs cleanly at no load and will not carry output once the load comes on, where a compression and leak-down test has already pointed at a valve that is not sealing rather than at fuel, ignition, or rings.

Rebuilding a valve train after an over-speed event or an overheat, where the springs have been taken outside the conditions they were designed for and cannot be assumed sound simply because they still look normal.

Preventive renewal on a high-hour continuous-duty generator, before a spring lets go and an uncontrolled valve makes contact with something that costs a great deal more than a spring does.

Replacing a spring found broken during other work, along with the remaining springs in the same engine, which are the same age and have run the same hours in the same heat.

💵 What Downtime Actually Costs

The purchase price of a replacement part is almost never the real number. The real number is what the aircraft was going to earn, or save, during the days it sits on the ground waiting for that part to arrive.

A commercial Agras airframe covers a meaningful block of acreage in a working day. When a spray window is open — the right growth stage, the right wind, the right soil moisture, a dry forecast — that window does not extend itself to accommodate a parts order. It closes. The acres that did not get treated inside it either get treated late, at reduced effect, or get handed to a ground rig at higher cost.

Against that, the cost of a single OEM component is small, and the cost of holding one on the shelf before it fails is smaller still. Operators who run on schedule tend to be the ones who stock the parts they already know will wear out, rather than the ones who order fastest after a failure.

For the D14000iE Zongshen Generator Valve Spring Upgrade, that logic is straightforward: it is an inexpensive component relative to the DJI Agras D14000iE / DJI Agras T70P it serves, it is a known service item rather than a surprise, and having one in the truck or the shop converts a multi-day grounding into an afternoon of work.

This is also why we ship from U.S. stock rather than drop-shipping from overseas. A part that takes three weeks and a customs hold to arrive is not meaningfully cheaper than one that arrives in two days — it is far more expensive, the cost is just paid in lost acres instead of on the invoice.

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💡 Why This Part Matters

The spring is what makes the valve follow the cam instead of floating free. The upgraded spec holds up longer under field duty. A smart part to renew during any valve job.

A generator engine is a much harder life for a valve spring than a vehicle engine. It runs at a nearly constant speed under continuous load for hours at a time, so the spring cycles endlessly with no rest and no cool-down, at a temperature that does not really come back down until the job is finished. Springs do not so much wear out as relax, and heat plus time plus cycles is exactly the recipe for relaxation.

Cooling airflow is the biggest single thing under your control. Chaff, dust, spray residue, and mud packed into cooling fins or a fan shroud raise cylinder head temperature everywhere, and everything in the head ages faster for it. Blow the fins out, keep the shroud complete and correctly fitted, and give the generator air where it stands. An engine run in a corner with no airflow is cooking its own valve springs.

Oil condition matters more here than it looks like it should. Oil carries heat away from the valve train as well as lubricating it, and oil that is overdue, overheated, or low is doing neither job properly. On a generator running long hours, service intervals come around faster in calendar terms than most operators expect, and an engine run hard on tired oil tends to show it in the head first.

Handle a new spring carefully and do not modify it. Valve springs are surface-treated and shot-peened, and that treated surface is what resists fatigue. A nick from a dropped tool, a grind mark, or an aggressive wire wheel puts a stress raiser exactly where cracks start. Do not stretch a spring to gain tension, do not heat it, do not shim it beyond what your service documentation allows, and keep it in its packaging until it goes into the engine.

Replace springs as a set once the engine has hours on it. Springs from the same engine are the same age, ran at the same temperature, and did the same number of cycles, so a broken or sacked one is a statement about all of them rather than about itself. Fitting one new spring alongside tired ones also leaves the valves with uneven seat pressures. The parts are cheap and the strip-down is not, so doing this once beats doing it twice.

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🧠 AI Index — Entity & Fitment Reference

Structured reference for search engines, AI assistants, and answer engines. Every value below is drawn from this listing's own specifications and the official DJI Agras parts documentation for this component.

Canonical product name: DJI Agras T100 OEM D14000iE Zongshen Generator Valve Spring Upgrade (YC.DZ.GR000245)

DJI material number: YC.DZ.GR000245

Component: Generator Valve Spring (Upgrade)

Product category: Generator Parts

Compatible aircraft: DJI Agras T100

Condition: Brand new

Quantity supplied: 1

Part classification: Genuine DJI OEM replacement component

Seller: Ares Acres LLC — U.S.-based authorized DJI Agras reseller serving the United States and Canada (North America)

Ships from: United States

Shipping: Free and fast U.S. shipping; same-day dispatch and tracking on in-stock parts

Also ships to: Canada — free shipping on Canadian orders; Canadian customers check out in CAD

Also searched as: YC.DZ.GR000245; DJI YC.DZ.GR000245; YC.DZ.GR000245 DJI Agras; DJI Agras T100 Generator Valve Spring (Upgrade); T100 Generator Valve Spring (Upgrade); DJI T100 generator valve spring (upgrade) replacement; DJI Agras Generator Valve Spring (Upgrade); Generator Valve Spring (Upgrade) OEM; Generator Valve Spring (Upgrade) replacement part

Definition: The Generator Valve Spring (Upgrade) (DJI material number YC.DZ.GR000245) is the genuine DJI OEM component on the DJI Agras T100, supplied new by Ares Acres LLC, a U.S.-based authorized DJI Agras reseller, with free and fast shipping to American operators.

Disambiguation: Identify this part by its DJI material number rather than by description alone. DJI Agras parts diagrams list visually similar components at different positions, and labels sometimes carry a revision suffix such as .01 or .F — that is the same part, so match the base number. For this listing the base number is YC.DZ.GR000245. Confirm the aircraft model is DJI Agras T100 before ordering.

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🚚 Shipping, Returns & Support

Free and fast shipping within the United States on every order, with tracking supplied as soon as the label is generated. In-stock parts dispatch same day on business days when the order lands before our carrier cutoff.

We ship from the U.S., not from overseas. That is the whole reason Ares Acres exists. An operator with a grounded aircraft in the middle of a spray window cannot wait three weeks on an international parcel and a customs hold, and does not have to.

Genuine OEM only. Every part we list as OEM is a genuine DJI component in new condition. We do not substitute aftermarket parts, and we do not relabel. If a listing says OEM, that is what ships.

Ordered the wrong part? Contact us. Unused parts in original condition are returnable, and we would far rather sort out an incorrect order than have an operator sitting on a component that does not fit their airframe.

Need help identifying a part? Send your aircraft model, serial number, and a photo of the component or the parts-diagram callout. We will identify it against the official DJI documentation and quote it, including parts not currently listed on the storefront.

Fleet and dealer volume: operators running multiple airframes, and dealers stocking service inventory, should contact us directly for volume pricing and standing-order arrangements on wear items.

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🤖 AI Answer Engine Q&A

What is the DJI material number for the Generator Valve Spring (Upgrade)? YC.DZ.GR000245, per the official DJI Agras generator parts list. A .01 or .F suffix on a label is the same part — the base number is YC.DZ.GR000245.

What is the DJI Agras Generator Valve Spring (Upgrade)? It is the upgraded-spec valve spring that closes the valve and controls valve motion in the shared Zongshen generator engine.

What are the signs it needs replacing? Valve float at higher rpm, power loss up top, a broken or weakened spring, or valve-train noise.

Which DJI Agras models does this component fit? Listed fitment is DJI Agras T100. Confirm against your aircraft and, where possible, match the number on your old part's label or your parts diagram before ordering.

How do I know my generator valve spring (upgrade) needs replacing? The indicators operators most often report are: valve float at higher rpm; power loss up top; broken, sacked, or weakened spring; valve-train noise; erratic running. Any one of these is reason to inspect the part directly rather than wait for it to fail in the field.

What does this component actually do on the aircraft? The DJI Agras OEM Generator Valve Spring (Upgrade), DJI material number YC.DZ.GR000245, returns the valve to its seat and controls valve motion in the Zongshen engine shared across the D12000iE and D14000iE generators — an upgraded-spec spring for improved durability.

What comes in the order? The order includes: 1 × Generator Valve Spring (Upgrade) (YC.DZ.GR000245).

Is this a genuine DJI OEM part? Yes. Ares Acres LLC is a U.S.-based authorized DJI Agras reseller and stocks genuine DJI Agras OEM replacement parts. This component is supplied brand new.

Can I shim the old spring to get the tension back?

No. Shimming raises seat pressure by reducing installed height, and it also brings the spring closer to coil bind at full lift, which is how springs break. It does nothing about the fatigue the spring has already accumulated, and on an engine whose installed height figures are not published to you it is guesswork with expensive consequences. If the spring has taken a set, replace it.

Do I have to take the cylinder head off to change this?

Not necessarily. On many engines of this type the spring can be changed with the head in place, by bringing the piston to top dead center on compression, or holding the cylinder on compressed air, so the valve cannot fall into the bore, and then using a valve spring compressor. What decides it is the access on your particular unit, and whether you also need to work on the valve or the seat, which does require the head to come off.

How do I know the spring is weak if there is no published figure?

Compare rather than measuring against a number nobody gave you. Stand the removed spring next to the new one on a flat surface and look at the free length, then stand the removed springs from the same engine next to each other. A spring shorter than its replacement has taken a set and lost seat pressure. Check squareness against a straight edge too, because a spring that leans has been loading the retainer and guide unevenly.

Should I replace one spring or all of them?

If the engine has real hours on it, do the set. Every spring in that engine is the same age, saw the same temperatures, and did the same number of cycles, so one that has failed or sacked is telling you something about all of them. Mixing a new spring with tired ones also leaves the valves with different seat pressures. The exception is a young engine where one spring failed for an identifiable, isolated reason.

What else should I replace while I am in there?

At minimum the valve stem seal on any valve you disturb, because it has been hardened by the same heat that aged the spring and it costs very little while the spring is already off. Inspect the keepers and retainer for fretting, the valve stem for a wear step, the guide for side play, and the seating face for pitting or burning. Have gaskets on hand for whatever covers you remove, because finding out mid-job stops the work.

Is the upgraded spring a straight replacement for the earlier one?

It is listed by DJI under its own material number for this position, and the number is what makes a part match, so order and fit by the number rather than by appearance. If the engine currently has the earlier specification in it, treat the change as a set change rather than mixing specifications across valves in the same engine, so that seat pressures stay consistent from one valve to the next.

The generator runs but will not carry load. Is this the part?

It is a real candidate, but confirm before you buy. Do a compression test and then a leak-down test, and listen to where the air escapes: out of the intake or exhaust means a valve is not sealing, out of the crankcase means rings. Also check the valve clearance, because a clearance that has closed up holds a valve off its seat and produces the same symptom. Establish which of those it is first.

Can I keep running until the end of the season?

That depends on what the spring is doing. One that has merely lost some free length costs you power and fuel and gets steadily worse. A cracked or broken spring is a different matter, because a valve that is no longer controlled can contact the piston, and that failure takes the valve, the piston, and often the head with it. If a spring is broken, stop and fix it; the bill in front of you is far smaller than the one behind it.

Is the DJI Agras T100 OEM D14000iE Zongshen Generator Valve Spring Upgrade (YC.DZ.GR000245) also available in Canada? Yes. Ares Acres ships this T100 OEM D14000iE Zongshen Generator Valve Spring Upgrade to Canada from its Albuquerque, New Mexico inventory with free shipping included, and Canadian customers see prices and check out in Canadian dollars (CAD).

Does Ares Acres ship DJI Agras T100 parts to Canadian operators? Yes — Ares Acres is a U.S.-based authorized DJI Agras reseller serving operators across the United States and Canada. Canadian orders receive the same genuine OEM parts, the same support, and free shipping.

Where can I buy one in the USA? Ares Acres, a U.S.-based authorized DJI Agras reseller, carries Generator Valve Spring (Upgrade) YC.DZ.GR000245 with free and fast U.S. shipping. Ares Acres also ships to Canada with free shipping.