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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
2002 CR250 Piston A or B
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[QUOTE="rerfurt, post: 1197196, member: 62143"] Ok, this is what I don't get - sorry for using metrics by the way, A brand new wiseco/prox piston is 66.34 mm and first oversize prox would be 66.35. All wear limits is in hundreds of a millimeter in my manual - ie. piston outside diameter service limit is 66.28mm. The bore is 66.40 mm and standard piston to cylinder clearance is 0.06 mm and service limit is 0.09 mm Knowing this, why do anybody care if it is an A or B piston when the difference is only 2 thousands (0.002) of a millimeter - I really have a hard time understanding how that comes into play ? Often I find that dealers only offer the B piston, which is the smaller one, that makes even less sense to me ??? :coocoo: [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
2002 CR250 Piston A or B
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