Maintenance & Technical > KX500 Original
piston movement/noise
karlosthejackel:
I removed the stator cover to check timing and while I was there I just rocked the flywheel lightly backwards and forwards. There is a "light clonking" noise coming from engine. I took the spannie off and there is quite a bit of movement in the piston I can even rotate it left and right very slightly. Being such a big piston im guessing there should be a bit of movement. is it normal? please say yes
sandblaster:
Sorry buddy.... No bueno....
Time to take her down before you blow her up :-(
karlosthejackel:
Well what can I say. Considering this engine has only just been split and rebuilt I think ive found some issues....
The pin is worn out as you can see. The piston is cracked but I think the liner is ok, It looks like a crack in the transfer port but on close inspection it just looks like casting to me close up. The piston is a standard size wiseco but seemed a bit slack in the cylinder but then ive never had a 500 apart before
Foxx4Beaver:
yeah, you've definitely got some issues there....I wouldn't assume the cylinder plating is ok until you measure it, you may find it's beyond it's wear limit.
the factory castings suck around all the bridges, period.
depending how much you're willing to spend, I'd just have it stripped, all the bridges re-welded, and re-plated to the closest size to what it is now....you need a new piston/rings/pin/bearing/circlips anyways, maybe even have the head reshaped?...might as well just do it all now and be done with it.
karlosthejackel:
The cylinder has a steel liner is that normal?
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