The pressure is an indication of the compression stroke. The pressure lasts only as long as the piston is moving up. It should fire the plug at the very top of that stroke. Thus TDC. Putting a new pencil in the spark plug hole just after you feel the pressure start, will allow you to be very accurate as to when the piston is at the very top. (number 1 is the front cylinder to the radiator) Best of luck. Jim
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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