It's a 1973 yamaha CT3. -New spark plug -New contact breaker -Fresh 20:1 fuel -Rebuilt and cleaned carb -New K&N air filter -Engine has compression of 120 PSI I am at my wits end with this thing. The only thing left for me to check is the timing but I cannot find a good resource online telling me how to do that. The service manual is very vague about it and specifies using a dial indicator which I don't have. How do I check timing?