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Old 09-17-2022 | 05:37 AM
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Cat 1
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From: Prince Albert, SK, CANADA
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Originally Posted by 1967brutus
Whoo hoo! That sure sounds healthy!

Keep a bit of margin above the 1000 RPM idle, because to the best of my knowledge, below 1000 RPM the retardation curve ends and the timing falls back to "set angle" AKA 28 deg BTDC.

!
Thanks for the tip Bert, didn't know this. I think I can hear this happen and its as the reading drops below 1000 on my tach - sound changes like its ignition related and the idle falters a bit.

Another thing I noticed as I tend lean I can hear an odd little exhaust "popping echo" sound. Is this common and is it a lean indication. I looked back at your boxer running on you tube and don't hear it but your probably set on the curve. Listen as I lean to shut off at the end and you can hear it well.. I can get it to make this sound when running and just wonder if its a good lean indication.

I also noticed you run mufflers - What are they off of?
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