Harley Davidson Engine Firing Sequence

Starter motor turns and the starter drive is kicked out to engage with the ring gear on the clutch basket.

Harley davidson engine firing sequence. It is established by the engines crank. Pump - Twin gerotor dual scavenge crank mounted and driven internal oil pump dry sump. The first cylinder fires the second rear cylinder fires 315 later then there is a 405 gap until the first cylinder fires again giving the engine its unique sound.

The correct definition for your engine type is 90 degree twin not a v-twin. Engine cranks and starts. The pins are 180 degrees apart from one another.

The crankshaft has only one pin and both piston rods connect to it. 097-109 mm Spark plug torque - 12-18 ft-lbs 16-24 Nm Oiling System. Fire-crank rotates 315fire-crank rotates 405fire-crank rotates 315fire-crank rotates 405 lather rinse repeat.

A Harley engine has two pistons. This design combined with the V arrangement of the cylinders means that the pistons cannot fire at even intervals. So heres the firing order.

To create this type of engine the crankshaft has two separate pins for the connecting rods from the pistons. Spark plug gap - 0038-0043 in. When motor cranks and fires up the over run clutch kicks the starter drive back off the ring gear so it doesnt damage the starter.

6 cyl engines the firing order of the engines are the same. This design combined with the V arrangement of the cylinders means that the pistons cannot fire. As you can see when the engine fires COLD there is only a minor force keeping the gasket together.