Why does my bike only work good with no airfilter?

Michael80chinadoll

Active Member
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Joined
Sep 11, 2024
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Northern Ireland
So here in ireland it’s starting to get colder (44.6F or 7 celcius) fyi,but normally my bike runs fine with a airbox on but yesterday I discovered that when i had just the filter on,no air box,it ran like crap,so i took the filter off completely and it revved out perfectly,i dont want to risk getting stones in my cylinder but what can i do?
 
So here in ireland it’s starting to get colder (44.6F or 7 celcius) fyi,but normally my bike runs fine with a airbox on but yesterday I discovered that when i had just the filter on,no air box,it ran like crap,so i took the filter off completely and it revved out perfectly,i dont want to risk getting stones in my cylinder but what can i do?
Changed over to Super unleaded,93 5% ethanol yesterday when the problem started
 
Try moving it down a notch.
Cant do that as its running lean now and that would make it even leaner
He is trying to tell you to run it richer...Moving the C clip DOWN the needle raises the needle UP from the float allowing more fuel to get in mixed with air.

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