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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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What should I set my ignition timing at?

What should I set my ignition timing at?

S&S recommends using electronic ignition with adjustable advance curve in Super Stock® and Super Sidewinder Long Blocks. Adjustable curve permits slowing rate of advance to control or eliminate pinging under heavy load or when elevated temperatures or poor quality gasoline are encountered. Install ignition according to manufacturer's instructions. Leave spark plugs out while static timing to ease flywheel rotation.

Flywheels in S&S Big Twin-Style Long Blocks have three timing marks:

( F ) = Front cylinder firing mark, 35 degrees before TDC with vertical line in center of hole.

See caution below.

( R ) = Rear cylinder firing mark, 35° before TDC with dot in center of hole.

( T:F) = Front piston, Top Dead Center with colon (:) in center of hole.

Most fully electronic ignitions are timed at TDC. Points and other ignitions with mechanical advance are timed at front cylinder firing mark. With correct mark centered in timing inspection hole, ignition at full advance will occur 35° before TDC. S&S, however, recommends setting initial timing at 32° BTDC. This can be accomplished by setting the ignition to fire when flywheel mark is leaving timing inspection hole on left side.