Harley Davidson Model 7 Engine 1911

1911 was the first year of the vertical fins on Harley-Davidson engines, the following is the Coil and Battery ignition system model 7 engine (Single Cylinder) therefore its right side show this round timing cover (with small tab) which hold the point arrangement, the push / pull rod coupled the Ignition timing retard with a compression relief mechanism based on forcing the exhaust valve to stay open for easier starting. the same engine was available with a Bosch magneto ignition system ( Model 7A) therefore can appear with the banjo style cover, the engine still based on the auto intake valve which open by the suction created by the piston down motion, this configuration will continue on the Single cylinders engines until 1913...

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