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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

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.