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Fuel screw/fuel mixture question

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Exhaust backfire is normally a sign of a lean (not rich) idle, but it can also mean that there is an air leak in the exhaust, commonly at the header/midpipe joint, but possibly at the head as well. Check that before you mess with mixture.


Excessively rich idle is prone to stalling when the throttle is chopped suddenly under a moderate load.  Lean idle tends to "hang", or drop back to idle too slowly when released.


Read: http://api.viglink.com/api/click?format=go&jsonp=vglnk_jsonp_14081347213656&key=fd4d0c8927dbf2331e83bbda32ac7c21&libId=7ae40bae-a2b8-4b4b-8fe5-867555016543&loc=http%3A%2F%2Fwww.thumpertalk.com%2Ftopic%2F378677-common-threads-look-here-1st-mods-maintenance-common-issues-and-faqs%2F&v=1&out=http%3A%2F%2Fwww.thumperfaq.com%2Fjetting.htm%23PJ&title=Common%20Threads%3A%20Look%20here%201st!%20Mods%2C%20Maintenance%2C%20Common%20Issues%20and%20FAQ%27s%20-%20YZ%20400%2F426%2F450%20-%20ThumperTalk&txt=http%3A%2F%2Fwww.thumperfa...%2Fjetting.htm%23PJ

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