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(Continued from
page 186)
11. Runs well,
idles well for a short period, then slows down and stops.
A. Weeds or other debris on lower unit or propeller.
B. Insufficient cooling water.
(especially probable with inline
C. Carburetor, fuel pump filter or screens dirty.
D. Bleeder valves or passages plugged.
E. Lower unit binding (lack of lubrication or bent).
F. Gas tank air vent not open.
G. Not enough oil in gas.
H. Combustion chambers and spark plugs fouled, causing pre-
ignition.
I. Spark plug heat range too high or too low.
J. wrong propeller (PreIgnition).
K. Slow speed adjustment too rich or too lean.
12. Won't start, kicks back, back fires into lower unit.
A. Spark plug wires reversed.
B. Flywheel key sheared.
C. Distributor belt timing off (magneto or battery ignition).
D. Timing and synchronizing out of adjustment.
E. Reed valves not seating or broken.
F. Poor engine or distributor ground.
G. Extremely lean operation
13. No acceleration, low top RPM
A. Improper carburetor adjustments.
B. Improper timing and synchronization.
C. Spark plugs (improper gap or dirty).
D. Ignition points (improper gap or faulty).
or triggering (CD) system.
E. Faulty coil or condenser.
F. Loose, leaking or broken ignition wires.
G. Reed Valves not properly seated or broken.
H. Blown head or exhaust cover gasket.
I. Weeds on lower unit or propeller.
J. Incorrect propeller.
K. Insufficient oil in gas.
L. Insufficient oil in lower unit.
M. Fuel restrictions.
N. Scored cylinder -- stuck rings.
O, Marine growth, hooks, rockers or change in load of boat, or flooded
bottom.
P. Sticky magneto plate or distributor.
Q. Carbon build-up on piston head at deflector.
R. Marginal CD amplifier or pulse pack.
14. No acceleration, idles well but when put to full power dies down.
A. High or law speed needle set too lean.
B. Dirt or packing behind needles and seats.
C. High speed nozzle obstructed.
D. Float level too low.
E. Choke partly closed.
F. Improper timing and synchronization.
G. Fuel lines or passages obstructed.
H. Fuel filter obstructed. Fuel pump not supplying enough fuel.
I. Not enough oil in gas.
J. Breaker points improperly gapped or dirty.
K. Bent gearcase or exhaust tube.
L. Marginal CD amplifier or pulse pack.
M. Faulty spark plugs.
N. Incorrect propeller.
O. Roughness or damage on front of gearcase causing ventilation
15. Engine runs at high speed only by using hand primer.
A. Carburetor adjustments.
B. Dirt or packing behind needles and seat.
C. Fuel lines or passages obstructed.
D. Fuel line leaks.
E. Fuel pump not supplying enough fuel.
F. Float level too low.
G. Fuel filter obstructed.
H. Fuel tank or connector at fault.
16. Loss of power under heavy load.
A. Wrong propeller.
B. Weeds or other debris on lower unit or propeller.
C. Breaker points improperly gapped or dirty.
D. Stator plate loose
E. Ignition timing over advanced or late.
F. Faulty carburetion and/or faulty ignition.
G. Prop hub slips.
H. Scored cylinders or rings stuck.
I. Carbon build up on piston head at deflector.
17. Cranks over extremely easy on one or more cylinders.
A. Low compression.
1. Worn or broken rings.
2. Scored cylinder or pistons.
3. Blown head gasket.
4. Loose spark plugs.
5. Loose head bolts.
6. Crankcase halves improperly sealed.
7. Burned piston.
18. Engine won't crank over.
A. Manual start lock improperly adjusted.
B. Pistons rusted to cylinder wall.
C. Lower unit gears, prop shaft rusted or broken.
D. Broken connecting rod, crankshaft or driveshaft.
E. Coil heels binding on flywheel.
F. Engine improperly assembled.
G. Water in cylinders
19. Motor overheats.
A. Motor not deep enough in water.
B. Not enough oil in gas or improperly mixed.
C. Bad thermostat.
D. Seals or gaskets (burned, cracked or broken).
E. Impeller key not in place or broken.
F. Plugged water inlet, outlet or cavity.
G. Obstruction in water passages.
H. Broken, pinched or leaking water lines.
I. Improper ignition timing.
J. Motor not assembled properly.
K. Shorted heat light wiring.
L. Bad water pump impeller, plate, housing or seal.
20. Motor stops suddenly, freezes up.
A. No oil in gas, or no gas.
B. Insufficient cooling water.
C. No lubricant in gearcase.
D. Rusted cylinder or crankshaft.
E. Bent or broken rod, crankshaft, driveshaft, prop shaft, stuck
piston.
F. Bad water pump or plugged water passages.
21. Motor knocks excessively.
A. Too much or not enough oil in gas.
B. Worn or loose bearings, pistons, rods or wrist pins.
C. Over advanced ignition timing.
D. Carbon in combustion chambers and exhaust ports.
E. Manual starter not centered.
F. Flywheel nut loose.
G. Flywheel hitting coil heels.
H. Bent shift rod (vibrating against exhaust tube).
I. Loose assemblies, bolts or screws.
J. Broken teeth in gearcase.
22. Generator or alternator will not charge.
A. Battery condition.
B. Connections loose or dirty.
(Continued on page 188)
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