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1. 06:26 PM - Dry Black velvet Plugs (Roger Lee)
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| Subject: | Dry Black velvet Plugs |
Hi All,
FYI
I was having an issue on cylinders 1&3 spark plugs running with a dry velvet black
coating. That means the mixture was a little rich. Not from idling too long
as some A&P's suggested. I rebuilt the carbs and the rich mixture problem went
away. The carb on that side evidently had an issue. Now both sides are a nice
light tan.
I must have had 4 Rotax people tell me I was idling too long, one suggested to
change the mixture screw which I did with out any good results. No one suggested
rebuilding a carb or that a carb might have had a leak (it was not the float
level, that was checked early on).
If you are having a velvet black coating on one side of your engine then rebuild
the carb. It's easy. Two gaskets and a few "O" rings, then sync the carbs.
The morale to the story is to have good differential diagnosis skills. Think of
all that might cause an issue and not just the easiest or most common.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=148494#148494
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