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Bike barely runs need help

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I replaced my pitking 96CC engine with a CRF50 bottom end with 86cc stroker kit/e22 head. I used the same carb and wiring for the new engine and it barely runs I can't get it to fire unless I hold the throttle about 1/2 way open once I get it running I have to keep it about half way open or more to keep it alive if I try to let it idle down it just dies and I have to twist the throttle open and closed to get it to come back. Having the choke on seems to help it a bit but it runs pretty bad either way.

Thanks for any help.

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If choke helps you are lean, get 1 jet bigger on the pilot and the main see how it runs. What is your jetting and what carb are you running? Are you running a atc/trx 90 crank and top end on your crf50 cases?

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