255-315 by Stens Max-Torque Pulley Clutch 3/4 inch Bore

Stens Max-Torque Pulley Clutch: This pulley will accommodate either an A or B belt. Max-Torque pulley clutches utilize sintered metal shoes, stainless steel garter spring and oil impregnated bronzed bushings.
Assembly: Clutch can be installed with the sprocket (or pulley) facing inboard or outboard with no adjustment needed. Never force the clutch on. Sand or file the engine crankshaft to take off any burs. If the clutch has a keyway, then a key must be purchased that is 3/16" squared x 1/2" long maximum. If needed, file key so it slips into the keyway. Set screws are only needed if the crankshaft is not drilled and tapped. WHENEVER POSSIBLE ALWAYS HOLD THE CLUTCH ON WITH A BOLT AND WASHER. The bolt diameter will vary with engine mfg, but the washer size should always be 1 1/8" in diameter. Clutches with a key built into the hub portion of the clutch have to be held on with the bolt and washer.
Maintenance: Squirt four (4) drops of 30 weight oil on clutch bushing just behind the snap ring area by the sprocket (or pulley). Make sure bolt and washer are tight.