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bought a iq 600 with crank bearing out, bought a use crank out of 2010 rush 600 cfi. add a slp top end kit, new seals and gaskets. put a few 100 miles on it but my rpms come up short. 7750 or so kinda inconsistant. after changing cfi fuel filter, and testing sled. I did compression test. 60 on both sides.. tried on other sled 110.. WTH, well head could be loose i guess, crank could be wrong. bunch of other things as well.. Any help welcome.. Thanks