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    1979 750 dohc wont rev past 6500 under load

    Hi, I have a twin cam 750 that is stock a part from a 4 into 1 exhaust. It won't rev past 6500 while riding and it seems to be rich. It revs in neutral. I have rebuilt the crabs and noticed it has 68 primary and only 75 secondary mains tried 95 and it was worse. Can anyone help
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