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Dirt Bike Brands - Other
400 with a 520 Piston/Cylinder
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[QUOTE="Bud-Man, post: 145185, member: 20830"] Shaw520, I'm confused on your comment about the 463cc displacement. Are you assuming that the custom piston will be larger in diameter than a 520's? It sounds like KTM is using the same con rod in both bikes, does anybody know if this is true? I'm guessing here, but the wrist pin to top of piston dimension is 4mm shorter on the 520 piston, which would make sense if the stroke is 8mm longer (con rod's big end is 4mm farther out on the crankshaft) and the cylinders are the same height. Sounds like the only way to get a 454 would be a custom "520" piston with same wrist pin to piston top dimension as the 400's or to use a 4mm longer con rod with a stock 520 piston. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
400 with a 520 Piston/Cylinder
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