Maintenance & Technical > KX500 Original

Wiseco piston install questions

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BDI:
I have never had a problem with the kx500 exhaust port bridges getting hot, bulging out and damaging the piston. I would think that drilling holes in the skirt like that would hurt the bikes primary comp ratio and impact the engines efficiency. Maybe it's necessary on an engine with a cast iron sleeve. That would be one more reason not to sleeve a kx500.

KXcam22:
I also never experienced any wear in those spots.  The bridge is actually quite thick in those spots.  I am helping a friend with a YZ125 (powervalve with a center bridge) and the stock piston comes drilled.  I have not seen the  wiseco replacement he got so I may have to drill holes in that one. Cam.

muleman:
I was always told to put the retainer clip gap up or stright down. Not any other way.

martinfan30:

--- Quote from: muleman on April 01, 2009, 11:21:21 AM ---I was always told to put the retainer clip gap up or stright down. Not any other way.

--- End quote ---


Is there a reason why?

speedywent:
Piston goes up and down not sideways. Circlip is more difficult to collapse from G's and release.

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