Question: How To Know When Your Rear Cylinder On A 88 Ci Harley Davidson Is In Base Circle?

How do you find the base of a circle?

To find the base circle of the exhaust lobe: rotate engine following the intake of that same cylinder as it opens, moves over the nose and almost closes, that will be the base circle of the exhaust lobe. Pretty simple and as you follow the valves you will start to see their relationships and the overlap period.

How much horsepower does a 88 cubic inch Harley have?

At 88 cubic inches (1,450 cc) of displacement, it is the largest production Harley motorcycle engine, and it produces 80 horsepower.

How do you test a pushrod adjustment?

Using an appropriate length dial caliper, measure the overall length of the washers and pushrod. The combined thickness of the two washers is subtracted from the gross length to determine true pushrod length.

What is the base circle?

: the circle of an involute gear wheel from which the involute forming the outline of the tooth face is generated.

What is base circle diameter?

Outside Diameter (O.D.) is the diameter of a circle around the outer surface, or tops of the gear teeth. Root Diameter (R.D.) is the diameter of a circle around the bottom (root) of the gear tooth spaces. Base Circle is the circle from which the involute portion of the tooth profile is generated.

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How long will a twin cam 88 last?

The twin cam was designed to last 100,000 miles without needing major service with regular maintenance.

How much horsepower is a 103 cubic inch Harley?

STAGE 4 KIT – 103 CUBIC INCHES This Street Performance Kit produces 103 hp and 110 lbs-ft of torque.

Which valves are open at TDC?

Both valves should be closed if it’s TDC at the end of the compression stroke. If it’s TDC at the end of the exhaust stroke, you should be in the valve overlap zone, with the intake valve partially open and on its way to opening fully, and the exhaust valve partially open on its way to closing.

How do I know if my push rods are too short?

If the witness mark is too close to the intake side of the valve-stem tip, the pushrod is too short. If the witness mark is in the middle or toward the exhaust side of the valve-stem tip, then the pushrod is too long.

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