I am working on this atv for a friend.It would run on choke as soon as you took it off choke it would spit spudder and die.I thoroughly cleaned carb with no success,even put another carb on and same thing.I adjusted valves which was noisy.when I was adjusting the valves I noticed the cam lobes were worn down so I removed the rocker cover to find worn cam and rockers.someone had put the oil filter in backwards.the engine had good compression so I replaced the cam and rockers,changed oil and filter and it crank right up but with same symptoms ,only run on choke.should I go back to the carb.any suggestions appreciated.
David

 

[img]i/expressions/face-icon-small-smile.gif[/img]i had same problem with a 300 and it was the carb we soaked it in cleaner overnight flushed good next day and rebuilt and it woys fine that was 2 yrs ago

 

I took carb apart and the iow speed jet was stopped up.runs good now.thanks

 

glad to be able to help you have a good day frank giles