My neighbors blaster can't figure this out. It will start but when it sits and idels it will be fine then all of a sudden it will just sart racing like if you pinned the throttle all the way down and there is know way to stop it unless you shut it off. I cleaned the carb not sure what else to do? Also it had a pro circuit pipe on and we put the stock pipe back on does it have to be re-jetted again? before we changed the pipe it was doing the idle thing so that wasn't causing it. Thanks for the help Merry x-mas




2006 450r
2006 eton viper 90 4 stroke
viper 50
alpha sport 50
polaris 330 trail boss (not a good mothers day gift stick with jewerly)

 

there is somethingh wrong with the throttle cable it might be worn out.

 

you need to check and see if its sucking air from somewhere? base gasket, head gasket,carb etc. start the motor and let it idle. spray some carb cleaner all over and see if the motor changes rpm's. i thinking you'll find one. let us know, keep us posted.

 

our lt160 did the same thing. we cleaned the carb out and it got better. check for bad or kinked orings in the carb. also try what sand mouse said. mine happend after it got jetted.

 

I'd do as sand mouse said and check for leaks. Also check the routing of the throttle cable sometimes if you change things you don't keep the routing of the cable correct and it causes the slide not to return to the stop which will cause it to rev to the moon. I had this happen on my blaster I put a the 28mm carb on and didn't pay attention to the throttle cable and it rested on the exhaust.