I have a yamaha yt175 and I have done just about everything i know how to do to it and it still wont start. I cleaned the carb and made sure the cylinder was in operating condition. It gets good spark and the air is free flowing. It gets gas and all the little hoses are clean. It has good compression and wants to start but just wont go. I dont know what else to do if anyone has any suggestions please speak your mind.