![]() 60 is pretty burbly off-idle, but it never quits. They run fine without pressure albeit requiring a fatter idle mixture (mainly the 60-4C). Is the airbleed hole clear? Are the metering grooves in the barrel clean? I have three Enya 4-cycles one I use a muffler and muffler pressure on (R1204C), the other two are 46-4C Mk I and 60-4C that I run without a muffler. There has to be something amiss to make it run that fat down low. better not respond because Brutus1967 maybe becomes angry.ĭoes he own one single ENYA 4C engine? ![]() Modified the engine carb I flying with, the air bleed.īut. I do fly ENYA 60 4C and own 3 ENYA four strokes. I have noticed before (without giving it much thought) that while a given carb (airbleed or older Perry) allowed for proper idle AND high speed adjustment both with and without muffler pressure, midrange was different between the two cases (usually better with muffler pressure). WITH muffler pressure, at full throttle the main needle needs to be closed further due to the pressure, but at idle, this muffler pressure falls nearly completely to zero, and now the main needle still is a bit further closed.Įrgo, the idle mixture becomes a bit leaner, because the delivery curve of the carb has changed somewhat. Idle mixture is what the main needle allows, leaned out by the air bleed screw. Without mufflerpressure, and with the main needle set for a good full throttle run, the idle mixture obviously does not let itself be leaned out sufficiently. ![]() Muffler pressure is higher at full throttle than at idle. ![]()
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