User Manual

A ENGINE WILL NOT START OR STARTS HARD

• Test spark plugs: GO TO ‘

• Test fuel filter: GO TO Ú

• Adjust choke cable: GO TO Å

• Adjust throttle cable: GO TO Æ

• Adjust idle mixture screw: GO TO Ö

• Test fuel transfer pump: GO TO Ü

• Check for sheared flywheel key—P218G (316 and 318) and P220G (420): See Engine CTM2.

• 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.

B ENGINE BACKFIRES

• Adjust idle mixture screw: GO TO Ö

• Check for sheared flywheel key—P218G (316 and 318) and P220G (420): See Engine CTM2.

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

• Check ignition system: See Section 240.

• Check for sticking valves: See Engine CTM2.

• Check and adjust valve clearance: See Engine CTM2.

MX,159022010,3 -19-05MAY95

MX,159022010,4 -19-27APR95

Diagnosis, Tests and Adjustments/Troubleshooting Guide

TM1590 (17MAY95) 220-10-2 316, 318 & 420 Lawn and Garden Tractors

020895

220