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Mikuni Carburetor Settings

for Kawasaki Motorcycles

Carb Basics (pdf)

KZ900 Factory Tune Up Specs

KZ900 Parts Manual

Tuning Tips

 

28mm VM28SC  Z1 & early Z1-A
 Main Jet  112.5
 Air Jet  1.0
 Needle Jet  P-8
 Jet Needle  5J9-3 - last number is the clip position where 1 is at the top of the needle (leanest) and 5 is at the bottom (richest)
 Throttle valve (slide)  2.5mm cutaway
 Pilot Jet  20.0
 Air Screw setting  1 1/2 turns out
   
 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
   
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
   
 29mm smoothbore  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
   
 29mm smoothbore  CB750
 Main Jet  115
 Air Jet  0.9
 Needle Jet  O-6
 Jet Needle  5DL31-3 (last number is the clip position)
 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
   
 29mm smoothbore  KZ650
 Main Jet  105
 Air Jet  0.9
 Needle Jet  O-4
 Jet Needle  5DL31-3
 Throttle valve (slide)  1.5mm cutaway
 Pilot Jet  15
 Air Screw setting  1 1/2 turns out