1985 Honda Odyssey 350 FL350R Shop Manual, Page 198Get this manual
TROUBLESHOOTING CHECK 9Check if engine overheats ENGINE DOES NOT OVERHEAT SYMPTOM PROBABLE CAUSE
OVERHEATS- i( 1) Excessive carbon build-up in exhaust pipe (2) Use of improper quality of fuel (3) Fuel-air mixture too lean ENGINE KNOCKS( 1) (2) (3) (4) Worn piston and cylinder Fuel air mixture too lean Use of improper grade of fuel Excessive carbon build-up in exhaust pipe (5) Ignition timing too advanced (Faulty COl unit)
1OAccelerate or run at high speed ENGINE DOES NOT KNOCK