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Aftermarket FCR 41

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I'm having trouble tuning my '01 XR650L Supermotard, setup as folllows: FCR 41 aftermarket carb, no airbox, K&N clamp-on air filter, FMF PowerBomb header and silencer. I can't get good throttle response from idle to about 1/4 or half throttle. A very pronounced stumble occurs, then revs fine to redline.

I have tried 58,68,75, & 90 pilots w/ 1-3 turns on fuel screw

Needle on 4 rth from top & 175 main. Best results with 75 pilot and 1-1/2 turns on the fuel screw. But it still stumbles. Any suggestions would be great! Do you have any kits for the Aftermarket FCR? :) Thanks. Michael

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What needle code is this with?

OCEMR? OCDVR?

Try a #50 pilot jet and #5 clip position to compare.

James

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The needle is OCEMR. I'll try your suggestion and let you know. Thanks for your time and valuable input on this forum. :)

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