This is a genuine Mikuni VM20-273
For brands such as Zündapp, Honda, and Yamaha
Equipped with
Main jet: #180 (4/042-strl)
Low-speed jet: #22.5 (M28/1001-strl)
Throttle needle: 4J13 (J8-)
Needle jet: O6 (239-size)
Throttle: 2.0 (VM20/491-cut)
Needle valve: 1.5 (VM15/172-size)
Air nozzle: fixed
Physical dimensions
Flange connection to engine: cc dimension 50–52 mm
Outer diameter against air canister: 43 mm
Total length: 66 mm
From center to highest point: 65 mm
From center to lowest point: 61 mm
Idle screw: left side
Float height: 19 mm.
Throttle screw: 1.5 turns