Maintenance & Technical > KX250 / KX125

BEWARE of Pro-x Pistons (pics)

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Roostmad1:
i agree that it really sucks when this sort of thing happens,i feel for you mate,stay away from pro-x is most probably made in china crap now like most things,what i do now if its not made in new zealand,aussie,US or germany or japan that part will not be going in or on my bike period,i,ve had it with this chinese rubbish,it because they can get a chinese "unskilled worker for a bowl a rice a day!!

1989kawasaki:
if that happened to my fully rebuilt 89 kx250 with a fresh replated cylinder and wiseco piston, i wouldnt know what to do / say.

jonny500:
there is nothing wrong with prox pistons, i have used them for 20 years with  no problems. there are 2 main manufacturers of piston is japan the art factory and the prox factory. both suply the 4 jap oem parts. you will see on genuine pistons that the name , on some is cast inside. there is some thing adrift here. either you have the wrong piston/year of bike or your engine geometry has been changed. 87-89 , 90-91 and 92-04 are the different pistons for the kx 250. if some of the other members that have old piston laying round could measure there pistons we may find  a difference.

jonny500:
also is the crank true. i noticed it only has damage from 1 crank half. if the crank is badly out of true it would cause the crank half to have a high spot. i quick test woud be to turn the crank while looking at the gap between the outer diamter of the crank halfs and the casings on each side to see if the gap has much variaton through out a revolution

BDI:
It may have nothing to do to with the length. The piston may be to big for the hole and if you ordered the new pro-x piston based off the number on the top of the old pro-x piston that would explain the identical damage. It is my experiance that when a piston is to tight the bike will idle just fine but when you try to ride it the piston sticks as soon as you try to get into the upper rpm.

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