Honda TRX300 Sportrax TRX300EX 1993-2008 80mm Cylinder Jug Piston Big Bore Kit
Honda TRX300 Sportrax TRX300EX 1993-2008 80mm Cylinder Jug Piston Big Bore Kit
SKU:Moto587-A025~1
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Fitment:
Fit for Honda Sportrax TRX300EX 2x4 1993-2008
Replaces Part Number:
Cylinder: 12100-HM3-L00, 12100-HM3-670
Piston: 13101-HM3-670
Piston Pin: 13111-HC0-000
Piston Ring Set: 13011-HM3-671
Head Gasket: 12251-HC0-013, 12251-HC0-003
Base Gasket: 12191-HM3-670, 12191-HC0-000, 12191-HC0-306, 12191-HC0-680
Chain Tensioner Gasket: 12194-HC5-740, 12194-HA0-000, 12194-HA0-306
2 x Circlips: 94601-17000
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 Molybdenum 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.
80 mm x 65.50 mm Bore and Stroke.
Piston is 80 mm.
11:1 Compression ratio.
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: 330 cc
Bore size: Big bore 80 mm
Piston diameter: 80 mm
Piston height: 46 mm
Piston pin diameter: 16.9 mm
Piston pin height: 55 mm
Stroke: 65.50 mm
Package Includes:
1 x Cylinder
1 x Piston
1 x Piston Ring Set
1 x Wristpin
1 x Circlips(2)
1 x Cylinder Head Gasket
1 x Cylinder Base Gasket
1 x Chain Tensioner Gasket
Note:
Big bore kit - 80 mm - 330cc.
Ring end gaps are checked prior to shipment for proper sizing.
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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.
Brought this for 1996 Yamaha badger 80 every fit right up and the the rings were already gapped correctly out of the box. This set up makes 40 psi more compression than the old one

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