[TR] TR4A plug check
Randall
TR3driver at ca.rr.com
Sat Nov 4 15:18:51 MDT 2017
> Have 1500 miles on rebuilt engine and Stromberg carbs. Was running good.
> Recently seemed to have lost a little power. Pulled the plugs. Looking
> for some clue as to the reason for what l found... #1 plug was black and
> slightly wet. #2 looked like the mixture was good. #3 was black but dry.
> #4 looked a little lean. Last pulled the plugs at about 1000 miles. They
> looked normal. Of course, I'm trying to figure out why plugs on the same
> carb are so different. Did not get them mixed up. Appreciate any ideas.
Check compression and valve lash; then valve lift. I suspect you've got one
or more valves that are leaking; but might be a cam lobe that is going away.
-- Randall
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