Polaris MSX 110 Owner's Manual For Maintenance And Safety page 102

Engine Overheats
Possible Cause
Clogged jet pump intake
Use of non-recommended fuel or oil
Sand or debris in cooling system
Plugged cooling system
Clogged exhaust pipe orifice fitting
Engine Backfires
Possible Cause
Weak spark from spark plugs
Incorrect spark plug gap
Old or non-recommended fuel
Incorrectly installed spark plug wires
Broken valves
Incorrect ignition timing
Mechanical failure
Solution
Clean intake
Replace with recommended fluids
Flush the cooling system
Inspect and clean cooling system
Clean orifice fitting
Solution
Inspect, clean and/or replace spark plugs
Set gap to specs or replace plugs
Replace with fresh recommended fuel
See your Polaris dealer
See your Polaris dealer
See your Polaris dealer
See your Polaris dealer
https://www.boat-manuals.com/
ENGINE TROUBLESHOOTING
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