My buddy is having a problem with his revo 3.3. He has the old style one with the blue pipe. Engine setup is all stock.
Problem is the egnine runs excessively rich no matter where you set the needles. He screwed the hsn all the way in and it still ran rich and smoked and spat fuel.
Pipe is not blocked and all the needles in the carb is good. What could possibly cause this? The lsn is at stock settings.