Z1-B Jetting 4 into 1 exhaust with and without pod

I'm planning to re-jet my 1975 Z1-B with VM28 Carbs. Below I have listed the stock jets and settings and the recommended jets and setting if running 4 into 1 exhaust and air pods. After installing the pods and experiencing the problems they cause with the side covers, I'm thinking of going back to the stock air box but with a K&N filter in it.

Does anyone have the recommended jets and setting for 4 into 1 exhaust and with stock airbox and K&N filter? Thanks in advance...

The stock Z1-B:
28mm (VM28SC) Late Z1-A & all Z1-B
Main Jet 112.5
Air Jet 1.0
Needle Jet O-8
Jet Needle 5J9-2 (last number is the clip position)
Throttle valve (slide) 1.5mm cutaway
Pilot Jet 17.5
Air Screw setting 1 1/4 turns out


With a 4:1 Header and unrestricted intake – possibly +1 on the pilot jet, and +3 on the main.
So in your case.

4-1 exhaust & pods Z1-B:
28mm (VM28SC) Late Z1-A & all Z1-B
Main Jet 120
Air Jet 1.0
Needle Jet O-8
Jet Needle 5J9-2 (last number is the clip position)
Throttle valve (slide) 1.5mm cutaway
Pilot Jet 20
Air Screw setting 1 1/4 turns out