Yep!
I've seen this on raced old school air-cooled motors that where pushing close to 100 hp that where raced. I don't disagree with Motodave, but find it somewhat common to 2 valve motors when used in this fashion over time. I've seen a 5-6 cases like this up against a wall.
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2001 Yamaha Zuma Leo Vince ZX pipe, 5,5 gram rollers, Bandito kevlar belt, NO2. Much more!
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