Standard Motor Products Starter Drive Clutch – Harley Big Twin & Sportster 1990–2022 OEM 31663-90

This Standard Motor Products starter drive clutch is built to restore proper starter engagement on late-model Harley-Davidson Big Twin and Sportster models. When your starter spins but doesn’t engage consistently, the drive clutch is usually the problem.

Designed as a direct replacement, this unit helps deliver smooth, reliable engagement between the starter and ring gear, getting your bike turning over the way it should.

Replaces Harley-Davidson OEM 31663-90, covering a wide range of applications from early Evo Big Twins through later Sportster models.

If your starter is slipping, grinding, or not catching, this is the fix that brings it back.

Fitment

Harley-Davidson Big Twin models – 1990–2006

Harley-Davidson Sportster (XL) models – 1991–2022

Replaces Harley-Davidson OEM 31663-90