Advertisement
TROUBLE SHOOTING
Engine Won't Start or Hard Starting
SCAMP
Possible Cause
No fuel in tank.
Fuel valve off.
Insufficient or excessive priming.
Spark plug lead disconnected.
Spark plug fouled.
Low compression in cylinder (80 PSI min.)
Incorrect air gap between C.D. pack and flywheel.
C.D. pack defective. (Refer to "CD Pack Testing,"
Pg. 15)
Primer hose disconnected from carburetor
or
con-
nector.
Primer hose restricted. (Refer to "Primer System
Draining," Pg.
63)
Air filter restricted.
Carburetor needle valve incorrectly adjusted.
Throttle valve stuck closed.
Carburetor-to crankcase screws not tight.
Carburetor-to crankcase gasket leaking air.
Float chamber screws loose.
Float chamber gasket leaking air.
Restriction in high speed nozzle.
High speed nozzle loose.
Float valve stuck closed.
Restriction in fuel passages (tank, valve, hose,
float valve seat).
Float level set too low.
Reed Valves stuck closed or bent open more than
.015".
Air leak between crankcase halves.
Intake plug leaking or missing.
Main bearing seals leaking.
Exhaust system restricted.
Zone Start Models
Incorrect kill switch adjustment (See Pg. 54 Fig. 12)
Kill switch inoperative. (See "Ignition Circuit Switch
Troubleshooting," Pg. 19-17).
Brake dragging on flywheel.
Bail not pulled back against handle.
Ignition Circuit ("Kill") Switch
(Zone)
The following conditions are indications of Switch
misadjustment
or
failure.
Engine misfires when in self-propelling mode
Adjust Switch (See Pg. 54 Fig. 17).
Engine stops if bail is not held extremely tight
against handle
Adjust Switch (See Pg. 54 Fig. 17).
Engine won't start (no spark)
Adjust or replace switch
Primer System Draining
If a mower is tipped back on its handle (as shown
below), fuel may run from the
carburetor and
settle in the lowest point of the primer line when
the machine is set upright. If this occurs, remove
the primer hose from the carburetor and drain the
fuel. Symptoms include rich running
and hot
starting problems.
SERVICE BULLETIN REFERENCES
19-63
Advertisement
