Multiquip MT85HS operation manual Engine Troubleshooting Symptom Possible Problem Solution

TROUBLESHOOTING

TABLE 4. ENGINE TROUBLESHOOTING

SYMPTOM

POSSIBLE PROBLEM

SOLUTION

Difficult to start

Ignition plug being bridge?

Check ignition system.

Fuel is available but spark plug

Carbon deposit at ignition?

Clean or replace ignition.

will not ignite. (Power available

Short circuit due to defective

Replace insulators.

at high tension cable).

insulators?

Improper spark gap?

Set spark plug gap to the correct gap.

Fuel is available but spark plug

Short circuit at stop switch?

Check stop switch circuit. Replace stop switch if defective.

will not ignite. (Power NOT

available at high tension cable).

Ignition coil defective?

Replace ignition coil.

Muffler clogged with carbon

Clean or replace muffler.

deposits?

Mixed fuel quality is

Check fuel to oil mixture.

Fuel is available and spark plug

inadequate?

ignites (compression normal).

Fuel in use inadequate (water,

Flush fuel sytem and replace with fresh fuel.

dust)?

Air Cleaner clogged?

Clean or replace air cleaner.

Defective cylinder head gasket?

Tighten cylinder head bolts or replace head gasket.

Fuel is available and spark plug

Cylinder worn?

Replace cylinder.

ignites (compression low ).

Spark plug loose?

Tighen spark plug.

Operation not satisfactory

Air cleaner clogged?

Not enough power available

Air in fuel line?

Bleed (remove air) from fuel line.

(compression normal, no miss-

Fuel level in carbureator float

firing).

Adjust carbureator float

chamber improper?

Carbon deposits in cylinder?

Clean or replace cylinder

Ignition coil defective?

Flush fuel sytem and replace with fresh fuel.

Not enough power available

Ignition plug often shorts?

Replace ignition wires, clean ignition.

(compression normal, miss-

firing).

Fuel in use inadequate (water,

Flush fuel sytem and replace with fresh fuel.

dust)?

Mixed fuel quality is

Check fuel to oil mixture.

inadequate?

Excessive carbon depostion in

Clean or replace crankcase.

Engine overheats.

combustion chamber?

Exhaust or muffler clogged with

Clean or replace muffler.

carbon.

Spark plug heat value incorrect?

Replace spark plug with correct type spark plug.