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intake and exhaust valves have different clearances so be careful when adjusting them, running is easiest and to avoid spilled oil make a shield out of cardboard so oil doesnt leak over lower head and yes, keep rpm low, just remember that the intakes and exhaust require 2 different clearances when adjusting them . 120 degree timing tape around balancer makes it much easier without engine running. same accuracy, same results as running. too much to type buy a book, take care