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Have a 85 Big Red 250 ES that when sitting in neutral will increase in rpms to nearly 3/4 throttle. When it is in low gear sitting and ideling it is fine. Any suggestions. Throttle cable seems to be free. New to your site, hope someone has some ideas !

 

[Saber6]

Welcome to the forums!! You need to check the boot that holds the carb onto the head for cracks.