1976 KZ900 Jetting help

Stock 1976 KZ900 15000 miles 4 in to 1 After marker chrome air box.Stock 1976 KZ1000 carbs.All valves have been set.I just picked this bike up and seen it has 122 main jets,17.5 pilots.Have not chech on needle clip.I know wiredGeroge has one of these bike,just trying to get a good starting point before I put the carbs back on.

They are stock 1976 KZ900 carbs.

From Z1E site:


26mm (VM26SS) KZ900A4 & A5
Main Jet 115
Air Jet 1.0
Needle Jet O-6
Jet Needle 5DL31-3 (last number is the clip position)
Throttle valve (slide) 1.5mm cutaway
Pilot Jet 17.5
Air Screw setting 1 3/8 turns out


If using free breathing air filter such as K&N and 4 into 1 header, the existing main jet may be okay, and would read plugs before changing jets.

The stock jetting on the 76 VM26 will accomodate the use of pod filters and 4 into 1 without much rejetting required. Your jetting is probably fine... keep in mind that the chrome box air cleaners like the one you are using can use most any filtering media and it would be pretty easy to make this type arrangement more air-restrictive so your jetting may depend more on how much filtering material and what type you use to pack the box.