20 HP Chassis 1 to 675 |
20 HP Chassis 676 to GHJ 30 (J Series) |
20 HP GHJ31 to 20/25 GKT22 (R Series) |
20/25 GKT23 to GSY 101 (Y Series) |
20/25 (Z Series Onwards) |
25/30 (L2 Series Onwards) |
25/30 HP Wraith (All Chassis) |
Markings and Firing Order |
Valve Timing Procedure |
 Ignition
Timing Procedure |