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TROUBLESHOOTING & REPAIR
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.4 - BLOWER PADDLE MARKED FOR STROBE-TACH METHOD
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TEST PROCEDURE
This test can be conducted by any of three methods.
Strobe-tach Method:
1.Stop the engine and remove the spark plug wire to prevent accidental kickback or starting.
2.With the black or red marking pencil, place a mark on one of the blower paddles, which can be reached through the vent slots in the end bracket. See Figure F.4.
3.Connect the
4.Reconnect the spark plug wire and start the engine. Direct the
5.Use the 7/16 wrench to turn in the spring- loaded adjustment nut. Increase the high idle speed until the tach reads 3700 RPM. See Figure F.5 for location of the adjust- ment nut.
Frequency Counter Method:
1.Plug the frequency counter into one of the 115 VAC auxiliary receptacles.
2.Start the engine and check the frequency counter. At the proper RPM (3700), the counter should read 61.7 Hz.
3.Use the 7/16 wrench to turn in the spring- loaded adjustment nut. Increase the high idle speed until the frequency counter reads 61.7 Hz. See Figure F.5 for location of the adjustment nut.
Oscilloscope Method:
1.Connect the oscilloscope according to the manufacturer’s instructions. At 3700 RPM, the waveform should exhibit a period of 16.2 milliseconds. Refer to the NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM (115 VAC SUPPLY) HIGH IDLE - NO LOAD in this section of the manual.
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