29mm mikuni jetting

I have a 1977 kz1000 LTD. It has the 1100 kit on it with heavy duty valve springs. Dyna ignition and coils. It has a stock airbox and the stock exhaust with some of the baffles removed. I am looking to put a set of 29mm mikuni carbs on it. My question is, what should my pilot and main jet size be? And what should the air screws be set at? Any information will be greatly appreciated.

cam9281 wrote:

I have a 1977 kz1000 LTD. It has the 1100 kit on it with heavy duty valve springs. Dyna ignition and coils. It has a stock airbox and the stock exhaust with some of the baffles removed. I am looking to put a set of 29mm mikuni carbs on it. My question is, what should my pilot and main jet size be? And what should the air screws be set at? Any information will be greatly appreciated.

From the good folks at Z1E :

Below is a reference of jet settings for the 29mm carb on Z1 / KZ engines. This is a good starting point for a bike with 4-1 exhaust, after market cams (up to 0.410" lift) and high compression pistons (approx 10.5:1). Each bike setup is different, so actual settings will vary.


29mm smoothbores Z1 / KZ900 / KZ1000
Main Jet 120
Air Jet 0.9
Needle Jet O-6
Jet Needle 5DL31-3
Throttle valve (slide) 1.5mm cutaway
Pilot Jet 17.5 or 20.0 (or 25 in the later versions)
Air Screw setting 1 1/2 turns out


Click > www.z1enterprises.com/reference/z1-carb-guide.aspx

Good Fortune!

id start at 20/120 1.5 turns out...i ran 17.5 but you have a bigger motor.....opps..just saw stock airbox...id go with the 17.5s......

Thank you Patton and Keith1 for your answers!