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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
KDX220 piston
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[QUOTE="Robcolo, post: 685052, member: 28062"] The reason that it's a "hit or miss" thing relates directly to the cause. Look inside one [better yet two for comparison] of the OEM pistons and closely examine the area around the transfer window. there are shrink marks and all kinds of casting irregularities in that area --and these vary from piston to piston. You'll find the same situation with the clutch hub & basket --and a friend's inner clutch hub recently cracked around one of these imperfections. In engineering terms these sharp edged areas create ACUTE ANGLES where stress becomes infinite and the metal fails. If one were to grind & polish those areas - eliminating the imperfections - you could probably use the OEM piston without any worry. IN the "old days" we used to polish con rods to prevent them from breaking. Get caught polishing your rod now they'd haul you in for indecent exposure. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
KDX220 piston
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