Basic Engine Adjustments - Air Conception REVOLUTION 200 Instruction Manual

6.2 Basic engine adjustments

WB37 or AC37 Carburetor adjustments
The most frequent activity is adjusting the idle speed. Membrane carburetors are quite
sensitive to the changes in atmospheric pressure. It means that there are days when the
engine works properly at idle speed, and days when it works unevenly, cuts out or, for
instance, works on too high speed.
Attention: All carburetor adjustments should be performed after warming up
the engine (approximately 2-3 minutes on low and medium speed).
If you notice that it takes too much effort for the engine to start and it does not work evenly
on low speed or if it works unsteadily (e.g. has a tendency to cut out), you should correct
minimum speed settings. It is usually enough to adjust the throttle's position with a screw
(horizontal screw lifting throttle lever), but in some cases it is necessary to change the
composition of the idle speed mixture.
WB37-AC37 carburetor has three screws that can be regulated. These are: throttle
positioning screw, idle speed mixture composition screw (L for low speed) and highspeed
mixture composition screw (H for high speed).
Default mixture composition screws settings for Nitro 200/Revolution 200 engines
are as follows:
The L screw unscrewed for 1 turn from closed position.
The H screw unscrewed for 1 turn from closed position.
Default mixture composition screws settings for Tornado 280 engine are as
follows:
The L screw unscrewed for 1 turn from closed position.
The H screw unscrewed for 1 turn & 10 minutes from closed position.
Default mixture composition screws settings for R200 Xtrem engine are as follows:
The L screw unscrewed for 1 turn & 5 minutes from closed position.
The H screw unscrewed for 1 turn & 15 minutes from closed position.
Default mixture composition screws settings for R280 Xtrem engine are as follows:
The L screw unscrewed for 1 turn & 5 minutes from closed position.
The H screw unscrewed for 1 turn & 15 minutes from closed position.
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