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914World.com _ 914World Garage _ Soot stains on the backside of the inlet valve?

Posted by: falcor75 Jan 7 2018, 05:59 AM

Doing the winter valve adjustment after around 2000 miles on a fresh my freshly built motor i noticed these dark stains on the backside of the #3 inlet valve. The inlet valves of cyl 1 and 2 have similar stains but cylinder 4 valve is clean.

What could cause this? and why would it be different between the cylinders?

Posted by: Mike Bellis Jan 7 2018, 04:55 PM

Cam/valve overlap.

Posted by: bretth Jan 7 2018, 05:47 PM

Maybe just some cooked oil residue?