81 KZ1000 doesn't go past 6000 RPM. Any ideas??

650ed wrote:

whirlwind598 wrote: Kinda sounds like my 750 does the same at 8000 around 90+mph. Dont know since the gauge only goes to 85. But that's probably its limit.

If your KZ750 is a 4 cylinder model (please add you bike's year & model to your signature line) I can personally attest that regardless of that NHTSA dictated speedometer the bike would exceed 120 mph when new. If yours won't go past 90 it needs work. Ed

I wouldn't be surprised if it does, but im no mechanic. I'll run it how it is until I upgrade if I can.

daveo wrote: I bought a set of KZ Police carburetors for parts, and found that each slide diaphragm had small a hole in the side of the metal cylinder. When checking into what that hole was for, some tech at Vance & Hines thought it was there meant to be a limiter of some sort.
If your slides have the hole, it could be what your problem is...if not entirely, it may be contributing to it.

I modified the set of slides by painstakingly filling each with JB Weld, after running a tiny tap through each one to rough-up the hole perimeter for adhesion (see photo).
Those slides are exactly the same as the original ones to my BS34's (with that exception), and are now sitting in a box, waiting to be used again. The rubber diaphragms are in excellent condition, and the hole plugs held up very well, for the season I used them.

Send a PM if you would like more info.

That is correct. Epoxy over each hole and no more rev limitations. Did it on mine.

Guess they didn't trust the cops. No wonder they were so slow.
Steve

I would love to see a n update to this thread. I'm betting it's ignition.