Stow MS-40M Troubleshooting Engine, Engine Troubleshooting Symptom Possible Problem Solution

MS-40M — TROUBLESHOOTING (ENGINE)

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a breakdown, please take a remedial action following the

diagnosis based on the Engine Troubleshooting (Table 3) information shown below and on the proceeding page. If the problem cannot be remedied, please leave the unit just as it is and consult our company's business office or service

TABLE 3. ENGINE TROUBLESHOOTING

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
	Inspect carburetor to see if fuel	Check fuel line
	is reaching it?
	No Fuel?	Add Fuel
	Water in fuel tank?	Flush or replace fuel tank.
	Fuel filter clogged?	Replace fuel filter
	Stuck carburetor?	Check float mechanism.
Poor starting
	Spark plug is red?	Spark plug is fouled. Check tranistor ignition unit.
	Spark plug is blue-white?	Insufficient compression, injected air leaking. Carburetor jets are
		clogged (overflow).
	No spark present at tip of spark	Tranistor ignition unit broken, high voltage cord cracked or broken.
	plug?	Start/Stop switch broken. Replace spark plug if fouled.
	No oil?	Add oil as required.
	Oil pressure alarm lamp blinks	Check Automatic shutdown circuit "oil sensor".
	upon starting?
	Engine will not turn over?	Replace cylinder and piston and if necessary axel joint.
	Cylinder head connecting bolts	Tighten cylinder head connecting bolts.
	loose?
Insufficient power output "no	Cylinder head gasket damaged?	Replace cylinder head gasket.
compression"
	Malfunction of valve seat?	Re-seat valves.
	Spark plug is loose?	Replace spark plug.
	Worn piston rings?	Replace piston rings.
	Malfunction in air-cleaner	Clean or replace air filter.
	system, air filter clogged?
	Air leaking in from interface	Tighten bolts between carburetor and cylinder head. Replace
Insufficient power output	between carburetor and cylinder	cylinder head gasket.
"compression"	head?
	Malfunction in fuel system?	Clean or replace fuel filter.
		Clean or replace carburetor.
		Check carburetor float.

PAGE 20 — STOW MS-40M— PARTS & OPERATION MANUAL — REV. #1 (05/17/02)