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motorcycle Big Bore Kits

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Wiseco Big Bore 440 Kit$292.99 – $302.92$412.12 – $414.79 You save up to 29%

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Latest Engine Reviews – You could win up to $500 for reviewing products!

Tusk Top End Gasket Kit
Antonio in CA
Great gaskets
Always good quality gaskets. I use them with every top end rebuild I do
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Tusk Competition Clutch Kit
Zachary in OH
Great clutch
Used this clutch many times and always held up extremely well, never had an issue with it. Iv always got the lighter springs the heavy owns and to hard in my opinion
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Tusk Competition Clutch Kit with Heavy Duty Springs
LEONARD in FL
Great clutch at this price point.
This kit came with everything you need. Both steels and fiber clutches. Heavy duty springs. It does NOT come with the gasket! Keep that in mind when ordering.
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Wiseco Piston Kit
Jeff in TX
Wiseco, not the cheapest, but quality/fitment never...
OEM no longer offered for Suz Rm125. I trust Wiseco more than other brands. Don't forget to drill holes (if required) for bridged exhaust ports to avoid seizure. Instruction in the box will tell you if drilling of holes is required.
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Wiseco Piston Replacement Circlip
Jeff in TX
Clip opening should face down towards the crank
On high rpm 2 stroke engines (up to 150cc), make sure you rotate the clips so the opening faces downward. Clip may fatigue and come out if you don't do top end rebuilds very regularly and they are not installed with opening facing down. I learned this the hard way.
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Kibblewhite Valve Spring Kit
Steven in PA
Spring kit
This is a great product never let me down overall I recommend to but them with the spring kit
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