Al;I prefer to use a ruler and measure along the angle of the tuned pipe.
I start from the center of the crankcase where it is in line with the tuned pipe.
As long as you measure the same way everytime and keep track of your pipe lengths, you can measure different ways.
Al Hobbs
Al,I'm headed for a race in Los Angeles. I'll be back next week and post a picture then.
Al Hobbs
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