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By windmill john
#96423
I was going to raise the issue that carbon build up increases compression ratio.
So the only thing I can think of is that, the carbon is rough and can affect the flow, swirl, of the incoming mixture and burn.
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By Wheaters
#96430
Mine did just that recently, but it stopped from idle so thankfully the valve wasn't damaged at all. It still resulted in a top end overhaul to get compression back.
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