Hi Paul,
Fuel doesn't come out of these tubes on normal operations unless the engine vibrates
so bad it shakes the heck out of the carb floats or the float arms are not
adjusted correctly. I would take the carbs off and check the float arm height.
These tubes are vents and if the carbs overflow fuel will leak out. These
tubes have to be in the right position. If they are out in the air stream or blocked
off it will cause problems like rough running.
If your differential pressure test and a static pressure test are all ok then a
valve is not sticking. Mystery oil in the right concentrations won't hurt the
engine, but don't mix all the other types fluids. Some people like to use the
Mystery oil with 100LL, but we all recommend the 91 unleaded fuel. If you use
100LL alot then use a fuel additive like Decalin to help reduce the lead build
up which will work better than Mystery oil. Mystery oil is like Chevy's and
Ford's. You like it and use it or you don't like it. I personally don't see a
real reason to use it with the Rotax engine.
If it seems to be only when it's cold or low rpms then you may want to double check
the enricher circuit (a.k.a. choke).
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
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