MIKATSU Outboard Troubleshooting
Engine runs unevenly or stalls in idle mode
Possible Causes - Corrective Action
The spark plug is dirty or does not match the type - Inspect the spark plug. Clean or replace type required.
Something is interfering with the fuel system - Check for pinched or twisted fuel hose.
Fuel is dirty or stale - Fill the gas tank with fresh, clean fuel.
The fuel filter is clogged - Clean or replace the filter.
One of the parts of the ignition system is defective - Take it to a Mikatsu master for repair.
Incorrect spark plug gap ignition - Inspect and adjust as required.
Bad contact or damaged system wiring ignition - Check wiring for wear or tear. Fasten all weak connections.
Wrong type of engine oil used - Check and replace oil with the required type.
The thermostat is defective or clogged - Take it to a Mikatsu master for repair.
Incorrectly adjusted carburetor - Take it to a Mikatsu master for repair.
Damaged fuel pump - Take it to a Mikatsu master for repair.
The air vent bolt is screwed onto fuel tank - Turn away a bolt of a ventilating aperture.
The carburetor air flap handle is removed - Return the handle to its original position.
Motor angle too high - Return to normal operating position.
The carburetor is clogged - Take it to a Mikatsu master for repair.
Incorrectly connected fuel connectors - Connect correctly.
Throttle valve incorrectly adjusted - Take it to a Mikatsu master for repair.
The engine will not start
Possible Causes - Corrective Action
Empty fuel tank - Fill the tank with fresh, clean fuel.
Fuel is dirty or stale - Fill the tank with fresh, clean fuel.
The fuel filter is clogged - Clean or replace the filter.
Incorrect engine starting - Read the section “STARTING THE ENGINE”.
Faulty fuel pump - Take it to a Mikatsu master for repair.
The spark plug is dirty or does not match the type - Inspect the spark plug. Clean or replace type required.
The spark plug cap does not fit well - Check and correct.
Bad contact or damaged ignition wiring - Check wiring for wear or tear. Replace Worn or torn wires.
One of the parts of the ignition system is defective - Take it to a Mikatsu master for repair. Ignition switch cable not fastened for the switch.
Secure the emergency release cable - The shift lever is engaged. Shift the lever to the neutral position.
Damaged internal parts of the engine - Take it to a Mikatsu master for repair.
Ignition switch cable not fastened for the switch - Secure the emergency release cable.
Starter is not working
Faulty part of the starter - Take it to a Mikatsu master for repair.
The shift lever is engaged - Flip the lever to the neutral position.
Engine power loss
Possible Causes - Corrective Action
Damaged propeller - Repair or replace the propeller.
Incorrect pitch or propeller diameter selected - Install propeller with recommended speed range.
Incorrect trim angle - Adjust the angle of the trim of the motor.
The motor is mounted on the transom at the wrong height - Set the motor to the correct transom height.
The bottom of the boat is overgrown with algae / marine organisms - Clean the bottom of the boat.
The spark plug is dirty or does not match the type - Inspect the spark plug. Clean or replace type required.
The gear housing is clogged with algae or foreign bodies - Clean the bottom of the enclosure from foreign bodies.
Something is interfering with the fuel system - Check if it is pinched or twisted fuel hose.
Obstacles in the fuel system - Clean or replace the filter.
Fuel is dirty or stale - Fill the gas tank with fresh, clean fuel.
Incorrect spark plug gap ignition - Inspect and adjust according to technical requirements.
Bad contact or damaged system wiring ignition - Check wiring for wear or tear. Replace worn wires.
One of the parts of the ignition system is defective - Take it to a Mikatsu master for repair.
Wrong type of engine oil used - Check and replace oil with the required type.
The thermostat is defective or clogged - Take it to a Mikatsu master for repair.
The air vent bolt is screwed onto fuel tank - Remove the vent screw.
Damaged fuel pump. Take it to a Mikatsu master for repair.
Incorrectly connected fuel connectors. Connect correctly.
Incorrect thermal zone of the spark plug - Inspect the spark plug and replace recommended type.
Excessive engine vibration
Damaged propeller - Repair or replace the propeller.
Damaged propeller shaft - Take it to a Mikatsu master for repair.
The propeller is clogged with algae or foreign matter bodies - Remove foreign bodies and clean the propeller.
The motor mounting bolt loosened - Tighten the mounting bolt.
Loosened or damaged king pin fist - Tighten the king pin or take it to the master for repair Mikatsu.