Shop replacement repair parts for Lawn Boy Lawn Mower model 10310/SERIAL: 3900001-3999999

Tecumseh flywheel key (woodruff key). The flywheel key aligns the flywheel in the correct position on the crankshaft. If the engine stops suddenly due to hitting a hard object, the flywheel key shears in half to prevent damage to the engine. If the flywheel key is broken, the engine won't start.

Oil seal

Bearing-ball

Shoulder bolt

Small engine recoil starter kit. The starter rope is pulled it causes the starter cogs to engage the drive cup on the flywheel and start the engine.

Cover-air cleaner

Lawn mower stepped washer.

Screw

Screw

Valve retainer

Screw-hwh

Washer-thrust, keyed

Nut

Breather tube kit

Plastic oil drain plug