Bikes: The JAP Long Four Speedway Engine

Speedway Workshop

Featured Pages
Supercharged Singles
Dunelt 500cc Two-Stroke

Sammy Miller's Ariel
GON-786 HT5 Trials
HT5 Ariel

Matchless OHC Racers
Collier's Overhead Cam Single 1923-1929
Matchless OHC 1920s

The 1933 JAP long four with Right Hand 12.5% Downdraught Carb.

First of Down Draught carb type - Open Valved and Double Feed Oil Pump.

Boxer Performance
Increased torque and peak power for BMW Twins.