excesive back-firing 640 adv?
Maybe worrying for nothing (640 adv 04) but regardless of speed or gear whenever I decellerate I am getting excessive back-firing, not the throaty type growl one would expect from a single but rifle cracks that have ex vietnam vets diving for cover!! In europe at the mo so fuel is still good, and am about 2000km before next service is due. Before I start camping up and overhalling, Is it valve clearance?
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