Wiseco Piston Kit 41.00mm

Wiseco piston kit contain everything you need to complete your rebuild the right way, the first time. High-quality parts specifically chosen to match Wiseco forged piston that's included in this kit.

2-stroke kit features Wiseco piston that is CNC machined for optimal cam shape and profile for peak power and long service life
4-stroke kit feature a race-ready finish with smooth edges for improved combustion flow
Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing
Horizontal slot-pin oiling reduces friction and provides scuff resistance, along with a pressure seal groove for maximum ring seal
Complete top end gasket kit gives you everything you need to complete your rebuild from premium materials
Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy
High-performance ring kit and alloy pin included with each piston kit for extended life and sustained power
Made in the USA

Specification	Details
Bore	41 mm
Country of Origin	USA
Displacement	50cc
Material	Aluminum
Size Over Standard	Stock
Stroke	37.8 mm

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.

KDX50 2003-2006
KFX50 ATV 2003-2006

JR50 1978-2006
LT50 QuadRunner 50 1984-1987

Customer Reviews

Great product for the price.

Great fitment, bike runs great.

Great kit. Huge power upgrade.

Perfect fit with more power.

Wiseco always makes a great quality product. Ive used them many times over the years an never had failures. Failures mostly happen due to lack of preventive mat. Nothing last forever!

Worked great.

Excellent part.

I ordered this piston kit and an Athena Cylinder as well. All parts were correct, well priced, and arrived in good shape ready to go on.

5 stars

Perfect fit, correct size rings came with it, and gaskets were a perfect fit, and the wrist pin was pristine.

Great product! Great price! Thank you!

I never write reviews but then again I've never been this satisfied with service. I ordered it Thursday got it Saturday kids were riding Sunday! Honestly super impressed by how fast it got here, it was in great shape and fit like a glove.

Awesome, thanks.

Part was exactly what we ordered.

I’ve put about 30 hours of hard riding on this and it’s been holding up well! I highly recommend it. Just be sure to fully warm up your engine before doing anything hard on the engine.

Very impressed with the design of the pistons, added oil ports in the ring grooves, the machining is high quality, the detailed packaging show how much pride they take in their work.

5 Stars

Very high quality piston just like you would expect from Wiseco. Shipped quickly and very well packaged. Yamaha Bigbear 350 is running better than it ever has after a top end rebuild and a carb kit. Honed out the OEM cylinder and ring gap was .018 with the rings sent. Specs said 16-20 so right in the middle. Very clear instructions on checking gap and positioning ring gaps on piston. 93 Octane and thing is way snappier on tip-in than it ever has been. Totally satisfied with Wiesco on this one.

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Questions & Answers

Will this fit my 92 trail boss 250 2x4

By John

?

So long as you have chosen a 1992 Polaris Trail Boss 250 2X4 and you have a stock bore size cylinder, you should have no problem with fitment.

By Andy

Will this fit a 1990 Honda xr200r

By Eddie

Yes, just be sure of what size bore your cylinder is before ordering.

By Andy

Would this fit a 96 xr200r with a 65.5mm bore

By Andy

I believe that bike came with a 65.5mm bore from the factory, so you would just need to choose stock size before adding to your cart.

By Andy

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Wiseco Piston Kit 41.00mm

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