I know this is not a hot topic, but if anyone with more carb. knowledge than myself would give advice I would appreciate it. I'm working on a 89 Yamaha SnoScoot , which is a 80 cc moped motor. Problem occuring is it runs fine until it hits wide open throttle, at that point it bogs and sometimes even dies. I've cleaned the carb. thoroughly replaced the pilot and main jet, made sure the jets are for the approp. elevation. Any ideas what might be causing this little motor to completely fall out on the top end? Thanks in advance for any advice.