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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Piston Replacement
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[QUOTE="thumper135, post: 1407073, member: 110851"] I am working on replacing the Pistons on a old 1983 Yamaha XJ400, 4 Stroke 400CC Bike engine, the previous pistons are well over the wear mark. Upon looking up for replacement pistons sadly I came to know none of the manufacturers make the pistons I'm looking for anymore, wiseco included etc. So now the best replacement pistons I have found from a different bike engine look to be identical EXCEPT the pin to deck height which is 1mm to 1.5mm shorter than the original stock pistons. I can make up for the difference of height by shaving either the bottom base of the cylinder or the head gasket surface area. Now I'm just unsure if it will cause any issues in the stroke or performance. Also if I can go ahead with the shave idea, what would you recommended to shave, the base of the cylinder or the top? [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Piston Replacement
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