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TROUBLESHOOTING & REPAIR
F-20 F-20
RANGER 250
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.4 – STROBE MARK LOCATION
MARK BLOWER
PADDLE
TEST PROCEDURE
1. Turn the engine off.
2. Perform the Case Cover Removal proce-
dure.
Strobe-Tach Method
1. With a white or red marking pencil, place a
mark on one of the blower paddles. See
Figure F.4 for location.
2. Connect the strobe-tach according to the
manufacturer's instructions.
3. Start the engine and direct the strobe-tach
light on the blower paddle. Synchronize it to
the rotating mark.
With the machine at HIGH IDLE the tach should
read between 3700 and 3750 RPM.
With the machine at LOW IDLE the tach should
read between 2350 and 2450 RPM.
4. If either of the readings is incorrect, adjust
the throttle as follows:
Adjust HIGH IDLE: Use the 3/8" wrench to
loosen the spring-loaded adjustment nut. See
Figure F.5 for location of the adjustment nut.
Turn the nut clockwise to increase the HIGH
IDLE speed. Adjust the speed until the tach
reads between 3700 and 3750 RPM.
Adjust LOW IDLE: First make sure there is no
load on the machine. Set the IDLER switch to
AUTO and wait for the engine to change to low
idle speed. Use the 7/16" wrench to adjust the
solenoid nut, which changes the amount of throw
in the throttle lever arm. See Figure F.6 for the
location of the adjustment nut. Adjust the nut
until the tach reads between 2350 and 2450
RPM.