Harley Davidson Engine Firing Sequence

A v-twin would imply something less then 90 degrees.

Harley davidson engine firing sequence. 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. Instead of one piston firing every 360 degrees a Harley engine goes like this.

This design combined with the V arrangement of the cylinders means that the pistons cannot fire. Starter motor turns and the starter drive is kicked out to engage with the ring gear on the clutch basket. 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.

Fire and Rescue Special Edition. All Harley 17 digit frame vin numbers since 1981 start 1HD1xxxxxxxxx. As you can see when the engine fires COLD there is only a minor force keeping the gasket together.

6 cyl engines the firing order of the engines are the same. When the engine fires under combustion that force is around 225 PSI and because this force is dynamic not static a dynamic factor of 2x is reasonable or 450 PSI trying to push the head off. So there it is.

The correct definition for your engine type is 90 degree twin not a v-twin. HD Street 500 - XG500 HD Street 750 - XG750. The pins are 180 degrees apart from one another.

There are many possibilities of what you have. The W3 uses its cubic inch to create the power thus keeping the package very reliable. This design combined with the V arrangement of the cylinders means that the pistons cannot fire at even intervals.