Maintenance & Technical > KX250 / KX125
Best way to go replacing a '01 bottom end
MXonaKawi:
I just went through the same exact thing. New OEM crank and all new OEM bearings. Seal & gasket kit from ebay, and new top end. Cost me $200 in labor from a buddy and about $500-$600 in parts.
needsatopend:
Pro-X Rod kit, Namura top end kit(piston, rings, gaskets, exhaust o-rings, etc), All Balls main bearing and seal kit. Ordered the stuff yesterday.
Actionman:
Everyone will regale you with tales of how bad Namura pistons are, but as long as your cylinder is in spec the namura pistons are very good in my experience. One thing I do is take a piece of 1000-2000 grit sandpaper and smooth any rough edges around the skirt, intake window, and side pockets where the pin slides in. I do that on any piston I use to keep stress fractures from forming. May not make a difference but I do it anyway.
needsatopend:
Wouldn't have been my choice, personally I would have gone wiseco forged. My brother has decided he wants to keep the bike and sell his 4 stroke honda. So he goes by his trusty go-to mechanic's advice. Only thing I told him about cast pistons is they normally come in a A, B, C option that are bumped 1 or 2 hundredths of a mm for worn cylinders. Well he placed an order for the standard bore 66.35 without giving it much thought, oh well hopefully it wont grenade on him
And here is the bike without those terrible graphics! much better
Actionman:
I used the c piston in mine. It should be fine Id imagine. Looks good!
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