440cc 89mm 1999-2014 Honda TRX400EX TRX400X Big Bore Jug Cylinder Top End Rebuild Kit
440cc 89mm 1999-2014 Honda TRX400EX TRX400X Big Bore Jug Cylinder Top End Rebuild Kit
SKU:Moto587-A039~1
Couldn't load pickup availability
Fitments:
Fit for Honda TRX400EX Sportrax 400 2x4 1999-2008
Fit for Honda TRX400X 2x4 2009-2014
Fit for Honda XR400R 1996-2004
Replacement Part Number:
Cylinder: 12100-HN1-A70, 12100-KCY-670
Cylinder Base Gasket: 12191-KCY-672
Cylinder Head Gasket: 12251-HN1-003
Cylinder Head Valve Cover: 12391-KCY-671
Tensioner Gasket: 14560-KCW-851
Piston: 13101-KCY-670
Pin, piston:13111-KCY-670
Ring Set, piston: 13011-KCY-670
Circlips, piston: 90601-KA5-000
Specifications:
Condition: Aftermarket 100% Brand New
Quantity: 1 Set
Piston Material: Forged Aluminum
Actual Displacement: 440cc
Bore Type: Big Bore
Bore Size: 89.00mm
Stroke: 70.00 mm
Features:
Kit includes piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured).
Cast piston has super-high silicone content for additional strength.
Piston skirts are Molybdenium Teflon coated to minimize resistance/wear and provide extended life.
Piston dome is anodized for superior heat resistance and longer lifespan.
The gaskets use performance materials to increase durability and provide greater reliability.
Includes all gaskets pictured to rebuild top end.
Kit is for big bore size - 89.00 mm.
All of the components within this kit are bolt-on ready for a hassle free installation.
Package Includes:
1x Cylinder
1x Piston(Big Bore)
1x Piston Ring Set
1x Wristpin
1x Circlip(2)
1x Cylinder Base Gasket
1x Cylinder Head Gasket
1x Chain Tensioner Gasket
1x Cylinder Head Valve Cover
Share
Unbelievable power boost for my 300! Easy install with clear instructions. Runs stronger than ever now.
Quick delivery, good item.
Got this cylinder kit (with piston and top end gaskets) for my 300 SX/XC—just a standard one, not big bore. But man, it’s held up amazing even through all the rough use I’ve put it through! No issues so far, works like a charm. Super happy with how durable it is.
Quick and efficient delivery! The package was sturdy and the contents were well protected. The kit appears complete with all necessary parts. A hassle free experience overall.
I received the item, it was packaged well and was as described. There was only one issue,the hole where the cam tension rod goes was just a bit to small. I tried installing with 2 different lubes, wiggled and twisted as much as it would allow and still couldn't get it to pass through the cylinder. I tried the old tension rod thinking it could have been the new rod. It wouldn't pass through either. Rather than return the item and wait for a new one with possibly the same issue, I decided to drill it out one size larger. I would highly recommend not doing this unless you have a drill press and feel comfortable using it. After drilling and cleaning it very well, the rod passed through, was installed and all is well.

Let customers speak for us
from 4783 reviews
This heavy-duty rocker switch is perfect for my marine project. The IP65 waterproof rating gives real peace of mind, and the build quality feels solid. Works flawlessly to control my motor. A reliable, no-nonsense component.
These body mounts revived my older truck's ride quality. The kit was complete and the brackets fit perfectly. Noticeably reduced cabin shakes and squeaks—feels much tighter now. Very sturdy and effective.
Perfect coil and plug set for my hybrid SUV. The vehicle starts instantly and idles much smoother now. Install was straightforward. Excellent performance and value for a full ignition refresh.
This AFM disabler works exactly as promised. It completely stopped the annoying cylinder deactivation in my truck. Feels smoother now and there's no battery drain. Great value compared to name brands. Highly recommend.
This CarPlay upgrade is a total game changer! The install was simple and everything works perfectly. It feels like a brand new system—so much better than the basic Sync. Fantastic and worthwhile upgrade.
This RS-style grille completely transforms the front of my car. The fit was spot-on and the glossy black finish looks fantastic. Installation took some patience but it was worth it. Amazing upgrade for the price!
This waterproof rocker switch is perfect for marine use. The IP65 rating gives me real peace of mind against spray. Build quality feels solid, it operates with a satisfying click, and the connections are straightforward. Exactly what I needed for my boat's accessory circuit without worrying about moisture. Does the job well.
This body mount kit fixed the sag and creaks on my F-350. The parts seem like OEM quality and came with everything needed. Installation was a bit of a job, but the difference is night and day—truck feels tight and solid again. Worth the effort for a lasting repair.
This coil and plug kit revived my RX400h. The old misfires and rough idle are completely gone. Everything fit perfectly, and the truck now starts instantly and runs incredibly smooth. It's like having a new hybrid system. Excellent value and a straightforward DIY fix.
This AFM disabler is a game-changer. Plug-and-play installation, and it completely eliminated the annoying cylinder deactivation in my Silverado. The truck runs smoother now, with no more rough transitions. A simple device that delivers exactly what it promises. Highly recommended.
This Sync 3 Apple CarPlay upgrade for my F-250 was totally worth it. Installation was straightforward, and now I finally have seamless CarPlay integration on my factory screen. Everything works perfectly: maps, music, calls. It feels like my truck came with it from the factory. An excellent mod for the price!
These seat belt clips are exactly what I needed. I use one to stop the constant "fasten seatbelt" chime when I have heavy items on the passenger seat. They are small, fit snugly, and the carbon fiber pattern looks decent. They work perfectly for their intended purpose.
The RS-style grille completely transformed the front of my A5. The fit was surprisingly good for an aftermarket part—it lined up nicely with the bumper. The glossy black finish looks sharp and aggressive. Installation required some patience, but the result is definitely worth it. My car looks brand new and meaner!
Absolutely satisfied and happy. The grill arrived in perfect condition. Quality 8.5/10
The RS5-style grille looks great and fits my Audi well. It's a solid upgrade for the price.