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Old 02-21-2010, 12:17 PM
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2door 2door is offline
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Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 16,222
Default Re: Spark plug gap...Myth? Fact?

Three of the four were the same manufacturer. I used a cam shaft degree wheel and a hub that I made on a lathe to attach the wheel to the crank. I did the check several times using a dial indicator to assure I had TDC (top dead center) on the piston. The keyways on the cranks are apparently cut, in-the-ballpark at the factory, probably due to imperfect machining practice or loose tolerances in their milling/broaching equipment. Generally speaking one or two degrees wouldn't be much to be concerned with but four degrees is pushing it some. Ignition timing is a critical aspect for achieving top performance. Altering rotor (magnet) position has been tried by several members with mixed results.

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Over Youth and Skill & "Charlie Don't Ride"

Last edited by 2door; 02-21-2010 at 12:19 PM.
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