Masalta MR70H, Instruction Manual

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SYMPTOM POSSIBLE CAUSE SOLUTION
Difficult to start
Ignition plug being bridging? Check ignition system.
Carbon deposit at ignition? Clean or replace ignition.
Short circuit due to deficient insulator? Replace insulators.
Improper spark gap? Set spark plug gap to the correct gap.
Check stop switch circuit. Replace stop
switch if defective.
Ignition coil defective? Replace ignition coil.
Muffler clogged with carbon deposits? Clean or replace muffler.
Mixed fuel quality is inadequate? Check fuel to oil mixture.
Fuel in use inadequate (water, dust)? Flush fuel system and replace with fresh fuel.
Air cleaner clogged? Clean or replac air cleaner.
Tighten cylinder head bolts or replace
head gasket.
Cylinder worn? Replace cylinder.
Spark plug loose? Tighten spark plug.
Operation not satisfactory
Air cleaner clogged? Clean or replace air cleaner.
Air in fuel line? Bleed (remove air) from fuel line.
Fuel level in carburetor float
chamber improper?
Carbon deposit in cylinder? Clean or replace cylinder.
Ignition coil defective? Flush fuel system and replace with fresh fuel.
Ignition plug often shorts? Replace ignition wires, clean ignition.
Fuel in use inadequate (water, dust)? Flush fuel system and replace with fresh fuel.
Mixed fuel quality is inadequate? Check fuel to oil mixture.
Excessive carbon deposition in
combustion chamber?
Exhaust or muffler clogged with carbon? Clean or replace muffler.
Replace spark plug with correct type
spark plug.
Governor adjustment improper? Adjust governor to correct lever.
Gvoernor spring defective? Clean or replace ignition.
Fuel flow erractic? Check fuel line.
Air taken in through suction line? Check suction line.
Dust in rotating part? Clean recoil starter assembly.
Spring spring failure? Replace sprial spring.
Not enough power available
(compression normal, no
missfiring)
Recoil starter not working
properly.
Rotational speed fluctuates.
Engine overheats.
Spark plug heat value incorrect?
Clean or replace crankcase.
B. Engine Troubleshooting Guide
Short circuit at stop switch?
Adjust carburetor float.
Defective cylinder head gasket?
Fuel is available but spark
plug will not ignite.(Power
available at high tension
code.)
fuel is available but spark
plug will not ignite.(Power
NOT available at high
tension code.)
Fuel is available and spark
plug ignites (compression
normal).
Fuel is available and spark
plug ignites (compression
normal).
Not enough power available
(compression normal, no
missfiring)
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