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The timing advancing when you rev the engine is normal. This is the centrifugal (mechanical) advance operating. (weights in the dizzy) You only need to tighten the dizzy up enuf so it won't rotate when you try to turn it. If you overtighten it obvious damage to the mounting hardware will occur, and it can make it nearly impossible to loosen up next time. I replied to your other post about the accel. pump question.
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