Harley Davidson Engine Firing Sequence

Harley-Davidson has a firing sequence thus.

Harley davidson engine firing sequence. 6 cyl engines the firing order of the engines are the same. The sound is actually from the engine design. To create this type of engine the crankshaft has two separate pins for the connecting rods from the pistons.

The engine number will match 3 alpha characters of the vin and the last 6 numeric digits. Front Bang rotate 315 degrees - Rear Bang rotate 405 degrees - Front Bang rotate 315 degrees - Rear Bang etc. Spark plug type Harley-Davidson - 6R12.

Instead of one piston firing every 360 degrees a Harley engine goes like this. HD Street 500 - XG500 HD Street 750 - XG750. 315 405 720 So a Harley V-twin has a 315 firing interval.

A piston fires. A 1130 Revolution 100 CV A 500cc Liquid Cooled Revolution X XG500. The pins are 180 degrees apart from one another.

Fire-crank rotates 315fire-crank rotates 405fire-crank rotates 315fire-crank rotates 405 lather rinse repeat. In diesel engines the firing order corresponds to the order in which fuels are injected into each cylinder. The rear piston arrives at its firing point on the compression stroke and a spark fires in the rear cylinder 315 degrees 360 degrees - 45 degrees in the V after the front did.

Chuck the firing order of your 90 degree twin is 1-2. That puts the rear cylinder into its power stroke and the front is on its intake suck stroke being pulled down by the crank. For gasolinepetrol engines the firing order corresponds to the order in which the spark plugs operate.