Bought for daughter’s truck. Finally got to install it . Causeshad down shifts when stopping. Installed several times and does the same thing. Removed and issue goes away. Will not be using.
Fix the issue
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SKU:M587-A018~7
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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 standard bore size - 83.00mm.
Piston is 82.95mm.
All of the components within this kit are bolt-on ready for a hassle free installation.
Specifications:
Condition: Aftermarket 100% Brand New
Quantity: 1 Set
Piston Material: Forged Aluminum
Actual Displacement: 348 cc
Bore size: STD 83 mm
Piston diameter: 82.95 mm
Piston height: 58.8 mm
Piston pin diameter: 19 mm
Piston pin height: 65 mm
Stroke: 64.50 mm
Replaces Part Number:
Cylinder: 1UY-11310-03-00, 5YT-11310-00-00, 4WU-11310-00-00
Piston: 1YW-11631-01-Y0
Piston Pin: 55V-11633-00-00
Piston Ring Set: 4GB-11610-00-00
Head Gasket: 1UY-11181-01-00
Base Gasket: 4KB-11351-00-00
2x Circlips: 93450-19095-00
Fitment:
Fit for Yamaha Big Bear 350 4x4 (YFM350FW) 1987 - 1999
Fit for Yamaha Big Bear 350 2x4 (YFM350U) 1996 - 1999
Fit for Yamaha Bruin 350 4x4 (YFM350FA) 2004 - 2006
Fit for Yamaha Bruin 350 2x4 (YFM350A) 2004 - 2006
Fit for Yamaha Grizzly 350 2x4 (YFM350G) 2007 - 2011
Fit for Yamaha Grizzly 350 4x4 (YFM350FG) 2007 - 2014
Fit for Yamaha Grizzly 350 4x4 IRS (YFM350FGI) 2007 - 2011
Fit for Yamaha Moto-4 350 (YFM350ER) 1987 - 1995
Fit for Yamaha Raptor 350 (YFM350R) 2004 - 2013
Fit for Yamaha Warrior 350 (YFM350X) 1987 - 2004
Fit for Yamaha Wolverine 350 4x4 (YFM350FX) 1995 - 2005
Fit for Yamaha Wolverine 350 2x4 (YFM350X) 2006 - 2009
Package Includes:
1x Cylinder
1x Piston
1x sets of Rings
1x Wristpin
2x Circlips
1x Intake Gasket
1x Cylinder Head Gasket
1x Cylinder Base Gasket
Note:
Ring end gaps are checked prior to shipment for proper sizing.
Please check out the product and size fits your motorcycle or not before you purchase.
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.

Fits nice, easy to install. Looks great. No complaints.
grill looks amazing shipping was super fast, and seller is super friendly, second time ordering from them.
Soiled steel bumper and looks great!
Product received exactly as described. Seller has great communication throughout the whole process. Competitive price. Will look for seller again for parts in the future. Keep it up.
Perfect fitment 👌🏼 👌🏼 Very easy to install.
Perfect fit and quick delivery. Highly recommend 👌
Good quality
Perfect fit of the parts and excellent service.
Wonderful!!!
Got it today
This buck-boost module is perfect for custom power setups. Easy to adjust, stable output, and compact. Great for DIY projects that need reliable voltage control.
These catalytic converters fit my Accord perfectly. Easy install, and the engine light stayed off. Great OEM-quality replacement at a fair price.
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This carburetor made my KX450F start and run smoother instantly. Simple to install, and the throttle response is crisp now. A reliable OEM-style upgrade.
Bought for daughter’s truck. Finally got to install it . Causeshad down shifts when stopping. Installed several times and does the same thing. Removed and issue goes away. Will not be using.
Great looking item well made. Easy install!!
Fix the issue
Good
Part arrived timely, not tested