jcoop86
CB750 Member
Needing some help here, I have an 81 750f I picked up in a trade. I have been trying to get the motor squared away before I really tear into it over the winter. Here's what I've done so far. New rectifier has it charging great 14.7 at 5k. New carb boot and no vacuum leaks to be found. It does have pod filters. 115 main jets. At one point it seemed to be running great but then something changed. It doesn't want to hit high rpms and spits and backfires trying to get there. Idle is almost uncontrollable. And a weird sucking/huffing noise Is coming from the #4 carb when accelerating I keep tinkering trying to figure it out but nothing changes. The carbs also have a fairly fresh rebuild too. I have bench synced them while I wait for my manometer to arrive. I'm looking for suggestions for things to check that I might not have already. I'm at my wits end here trying to figure this out. Please help!