Yea, I found from FZ750.com archive that 3k rpm problem being a common problem with 4-1 systems in FZ.. There also read that with different pilot jets and dyno time it may be possible to solve.. Oh well, Arch, what have u tried so far..? 😉 Yea, I would think a FZ from -87 onwards with 4-1 originally, don’t have this problem. Maybe should try find out what’s inside their carburetors. Anyway, I’ve changed this most sweetly carbureted bike into a monster! 😀
edit: and I’m not planning to give it any dyno time.. So I guess cleaning carbs, messing with pilot jets and jet needle is about all one can try, and probably try in vain too..