Maintenance & Technical > KX250 / KX125

Top end knocking?? Is this normal?

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joetaco87:
I also noticed they have different stock piston sizes (A,B,C)  Do you think getting a "B" or "C"  size piston will give me a little while longer before i have to send the top end out?  The piston thats in there now is "A" size.

KXcam22:
My understanding is that the A B & C pistons are all different sizes (slighly larger) and are installed to match the manufacturing tollerances of the cylinder.  You could probably run a C in a  worn cylinder that an A is too loose in but I have no direct experience in doing that.  It is possible that you have a C cylinder too, with the A piston being too small. Some measurements will tell the story. Cam.

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