Would soot build up around the exhaust valves be a sign of the valves starting to excessively wear? I adjusted the valves 15K + miles ago. I set the exhaust valves as close to 30 as possible but they are now reading 25 and 23...the bikes got around 30k miles
I'll adjust the valves now and check them after a few rides, Just wondering if the soot build up is common?
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