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Old 10-11-2010, 08:21 PM   #1
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chapman twin

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does anyone know what the timing should be for a 76 cc twin chapman
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Old 10-13-2010, 07:34 PM   #2
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Re: chapman twin

thanks guys i figured it out the previous owner had it so retarded it was firing at the bottom. had to move the throttle linkage 1 1/4 inchs lower the hall sencer ring in order to get 28 degrees advance now i have power starts on first turn
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Old 10-13-2010, 09:31 PM   #3
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Re: chapman twin


Glad you got it solved.

So what airplane is this mounted in?
Jim Daly
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Old 10-13-2010, 11:49 PM   #4
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Smile Re: chapman twin

Reminds me of the time I was discussing a neighbour's old Ariel Twin motorcycle, he said he couldn't get it running because nobody could tell him the firing order. "Wouldn't it be 1-2 " I said, he thought long and hard and said, "I guess it's the timing I need to know then..."
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