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My 04 rm 125 won't idle

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I have a 04 rm 125 with a big bore kit to a 144 and it won't idle, I know a 125 isn't supposed to idle for very long but I think I think I should be able to let off the throttle for a sec as I come into the corner, it won't stay running for more than a second after throttle is let off and I have cleaned my carb and tried adjusting the idle screw but there was no difference. Can anybody tell me what to do??

Edited by ZachBoot20

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My experience, its a combo of pilot jet, air screw and idle screw adjustment to get the engine to idle.

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Playing with idle screw isn't going to do it alone, as you've found. When I can't dial up the idle speed with the idle screw, that tells me the pilot jet/ air screw system is not set up properly.

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