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EXC - Piston Replace at 135 Hours?

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19K views 4 replies 4 participants last post by  sfenn99  
Hi Paco,
I have a 18' 500exc with 330hrs / 18,000 km on it.. (Canada) I just did my leak down test and it was at 5% so it's doing very well.. I've never cracked the motor other than to check / adjust valve clearances. I run mine fairly hard also.
Hope this helps