Allens Performance Ltd.

VM20-151 Carb Data Set

MOUNT TYPE Clamp-on MAIN JET 4/042-Size 65
TICKOVER POSITION Left PILOT JET VM22/210-Size 30
COLD START POSITION Left NEEDLE JET VM15H1/17-Size(145) O-6
COLD START TYPE Lever JET NEEDLE 4DH11 Clip Groove #3
AIR SCREW POSITION Left STARTER JET Fixed
FLANGE PITCH (MM) PILOT AIR JET
CLAMP DIA (MM) 26 PILOT AIR SCREW VM20/305 1.5 Turns out
FRONT SPIGOT DIAMETER (MM) MAIN AIR JET Fixed
REAR SPIGOT DIAMETER (MM) 35 POWER JET
LENGTH (MM) 67 THROTTLE VALVE VM20/565-Size 2.5
HEIGHT OVER BORE CENTRELINE (MM) 60 FLOAT VALVE VM15/172-Size 1.5
HEIGHT UNDER BORE CENTRELINE (MM) 55
FUEL INLET POSITION Left
FLOAT HEIGHT (MM) 22
FUEL SPIGOT (MM) 6
Exploded Carb Parts Diagram Fiche for Mikuni VM20-151 Carburettor
1 Dust Cover: Cable Adjuster 30BIC/84
2 Cable Adjuster M21/14
3 Locknut: Cable Adjuster B30/247
4 Carburettor Top VM20/433
5 Seal: Carburettor Top VM20/47
6 Spring: Throttle Return VM20/47
7 Retaining Plate: Jet Needle VM22/108
8 E Clip: Jet Needle VM18/341
9 Jet Needle #
10 Throttle Valve VM20/565-size
11 Needle Jet VM15H1/17-size

(145-Size)

12 Dust Cover: Cold Start Assy VM20/455
13 Retainer: Cold Start Assy VM20/456
14 Lever: Cold Start Assy VM18/215
15 Indexing Plate: Cold Start Assy VM18/151
16 Spring: Cold Start Assy VM16/42
17 Plunger: Cold Start Assy VM18/144
19 Gasket: Float Bowl VM17/161
21 Pilot Jet VM22/210-size
22 Pivot: Float Arm BV26/22
24 Float VM20/460
25 Float Bowl VM18/161
29 Pilot Air Screw VM20/305
30 Spring: Pilot Air Screw M12F/46
31 Spring: Tickover Screw M12F/46
32 Tickover Screw VM18/164
33 Gasket: Float Valve Assy VM15/07
34 Float Valve Assy VM15/172-size
36 Main Jet 4/042-size
38 Screw: Float Bowl CW2=0414
40 Seal: Carb Mount VM20/326
41 Sleeve: Carb Mount VM20/327
47 Screw: Carb Mounting Clamp VM19SC1/80
48 Nut: Carb Mounting Clamp N1=06