I have an old 1998 Yamaha Blaster that has worked good for me until now. It wont start but it will turn over and everything else sounds good. I've checked the spark, air filter, exhaust pipe, wiring, and cleaned the carborator. I cant seem to find anything else to try, there is gas in the tank and oil in the injection system. What else could be wrong with my blaster??

 

Check compression My be time for a new top end

 

what is the easiest way to do that?

 

With a compression tester!

 

Hey put a new spark plug in it anyway. Just because a spark plug will spark when laying on the head, does not mean it will spark under compression. We carry about 6 extra when we go race. Our blasters eat them like candy. Just saying

 

if you dont have a tester for compression take the plug out plug with your thumb over the head and turn it over if it blows your finger or thumb off with you trying to stop it from blowing it off it generally has good compression (used more in field testing than in tuning up and repairs but also gives you an idea)