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I just did a top end on an rm 125, the bike would stay running before I did the swap, now I can't get the bike to idle properly. It starts first kick and will idle for a minute but won't stay running without some throttle, also struggles whenever you click into gear. I'm running 32:1, adjusting the idle and air screws didn't help much, my float was good and I cleaned all my jets. Not sure what to try, any advice is appreciated. Thanks.

Edited by Granger

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if the airscrew does nothing then the idle is to high , if the idle screw does nothing the tip might be to worn out

if they both don't have any effect  ( both add more air ) then the pilot might be way to big

fresh engines are a more efficient air pump and require cleaner/leaner jetting

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