Has anyone had to overbore their 300 exc?

binthedirtnow

Member
Mar 29, 2005
149
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Has anyone ever had piston slap in their 300 exc and actually had to overbore it to fix the problem? Or is it unlikely for the 300 exc to need overboring due to piston slap? Is piston slap unlikely in the 300?

I'm curious because a friend of mine has a bike I might buy from him, but the motor is a little noisy and my other buddy says it sounds like piston slap, and the motor needs to be overbored. Does this sound like something that could be going on in a 300?
 
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