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Discussion Starter · #1 ·
Hi so I have a older 03 foreman 450 yes it’s old but it runs, anyways sometimes it will mis fire it missed 4 times today in the matter of like 2 or 3 hours it also has a new spark plug, and when it’s cold out side the atv will idle very low but when it’s warmed up it idles to high, any idea why that might be? Thanks
 

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You might not even have to rebuild the carb, from what it sounds like, you are just running a little rich, Look up hoe to do a tuning on the carb for your specific model.
 
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