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Xr50r starts fine, idols good and has power if I'm easy with the gas. As soon as I rev to fast the bike will bog.

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My xr50r has a takegawa 88cc kit with the keihin 20mm carb. The carb is clean. It runs good but has a serious throttle problem. If I'm at idol and gas it hard it will bog and even die if I hold it there. If I'm riding and give a good twist it just bogs. Im lost, I tried re jetting and needle adjustment. My air screw is best at 1 1/4 turns out and hours of adjusting doesn't help the bog. Spark plug is fine.

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