Mikasa Sangyo MVC-88GE VAS, Instruction Manual

1. Gasoline Engine

(1)  Starting problem

Fuel is supplied, but 
Spark Plug does 
not ignite

Electricity reaches 
to High Voltage Cable

Electricity does not 
reach to High Voltage 
Cable

Bridging Spark Plug
Carbon accumulated on Spark Plug
Short circuit due to insulation problems of 
Spark Plug
Inappropriate gap of Spark Plug 

Short circuit of Stop Switch
Ignition coil problems
Oil Sensor problem

The wrong fuel is used
Mixing of water or dust contamination
Air Cleaner not working

Intake/Exhaust Valve is stuck or pushed up
Piston Ring, Cylinder wear enough
Cylinder head, Spark Plug tightening problem
Head gasket or Spark Plug Gasket breaks

Dirt of Air Cleaner
Carbon accumulated in Cylinder.
Fuel Level in Carburetor inproper

Compression is 
good

Compression is 
not good

No fuel in tank
Fuel Cock does not open properly
Clogging of Fuel Filter
Clogging of Tank Cap Air Hole
Air trapped in fuel pipe 

Fuel supplied, and 
Spark Plug 
ignites

Fuel does not reach 
to Carburetor

(2) Operation problem

Compression is 
good and no firing 
problem

Insufficient compression (see the item “compression is not good.” )

Compression is 
good, but no firing

Water mixed in fuel
Dirt of Spark Plug
Ignition Coil problem

Lowered power

Engine overheating 

Carbon accumulated inside combustion chamber and exhaust hole.
Thermal value of Spark Plug is poor
Dirt and breakage of Cooling Fin

Revolution fluctuation 

Governor adjustment inappropriate
Governor Spring problem
Fuel flows in proper
Air taken from Intake Pipe line
Clogging of Pilot Jet ( Idle speed fluctuates improper)

(3) Recoil Starter does not work well

Clogging of dust from rotating part

Weakening of Spiral Spring

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13. Troubleshooting