Zenoah G231PUM Owner's Service Manual

Contents

Zenoah G231PUM Owner's Service Manual Manual pdf 9 page image

The carburetor is provided with 3 adjust screws which are set to the best(approximately) positions by our company, but they may need a little adjustmentdepending on the temperature, atmospheric pressure (altitude), etc. of the area wherethe engine is used. Start the engine without making any adjustments. Makereadjustments only when the engine shows any mal-running.Standard opening of each needle as follows;Idle Screw:Turning this screw clockwise increases the idling R.P.M. Turning itcounterclockwise decreases the idling R.P.MLow Speed needle:This is the fuel adjust screw (not the air screw). Turning this needle clockwisemakes the mixture gas leaner and turning it counterclockwise makes it richer.Set this needle at a position which is 1/4 open from best mixture (maximum R.P.M.)position.High Speed needle:Turning this needle clockwise makes the mixture gas leaner and turning itcounterclockwise richer. Set this needle at a position which is 1/8~1/4 open from themaximum R.P.M. position while the airplane is on ground.1. Do not tighten the High and Low Speed needles too firmly.2. When the unit has just started and the engine is not warm enough, there maybe insufficient acceleration and the engine may be stopped. Be sure toperform idling before operation.CAUTIONLow Speed needleHigh Speed needleIdle ScrewFig.58. Carburetor Adjustment9H LG260PU 1 3/8 ± 1 /4 1 3 /8 ± 1/4G231/G260/G290PUM 1 5/8 ± 1 /4 1 ± 1 /4G231/G260PUH 1 7/8 ± 1 /4 1 1 /4 ± 1/4