User Manual

E ENGINE DOES NOT DEVELOP FULL POWER

• Adjust throttle cable: GO TO Æ

• Adjust choke cable: GO TO Å

• Adjust governor linkage: GO TO Ò

• Adjust carburetor: GO TO Ö

• Test spark plugs: GO TO ‘

• Check muffler for restriction or plugged condition.

• Test fuel filter: GO TO Ú

• Test fuel transfer pump: GO TO Ü

• Adjust timing—B43E (316), B43G (318) and B48G (420): GO TO 1!

• Check ignition system: See Section 240.

• Test compression pressure: GO TO 1@

• Test crankcase vacuum: GO TO 1Ô

• Inspect crankcase breather: See Engine CTM2.

• Check and adjust valve clearance: See Engine CTM2.

F ENGINE RUNS ERRATICALLY

• Check for loose electrical connections: See Section 240.

• Test spark plugs: GO TO ‘

• Adjust carburetor: GO TO Ö

• Adjust dashpot—B43E (316), B43G (318) and B48G (420): GO TO Õ

• Adjust governor linkage: GO TO Ò

• Adjust timing—B43E (316), B43G (318) and B48G (420): GO TO 1!

• Test fuel filter: GO TO Ú

• Test fuel transfer pump: GO TO Ü

• Check ignition system: See Section 240.

• Test crankcase vacuum: GO TO 1Ô

• Inspect crankcase breather: See engine CTM2.

• Check and adjust valve clearance: See Engine CTM2.

• Check carburetor for plugged passages: See Engine CTM2.

MX,159022010,7 -19-05MAY95

MX,159022010,8 -19-08MAY95

Diagnosis, Tests and Adjustments/Troubleshooting Guide

TM1590 (17MAY95) 220-10-4 316, 318 & 420 Lawn and Garden Tractors

020895

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