BDL 8 mm 3” Belt Drives for 4-Speed Big Twin for Kick Start

Primary belt by BDL; for BDL belt drives with 47 x 76 pulleys; fits 4-speed Big Twin 1936-1984; fiber glass/rubber compound; width: 3”; pitch: 8 mm; number of teeth: 144; USA; gross weight: 551 g

Primary belt by BDL; for BDL belt drives with 47 x 76 pulleys; fits 4-speed Big Twin 1936-1984; fiber glass/rubber compound; width: 3”; pitch: 8 mm; number of teeth: 144; USA; gross weight: 551 g

The “Big Fix” kit replaces the original caged roller bearing of the clutch basket on Harley-Davidson four-speed Big Twins (1000, 1200 and 1340 cc, model years 1941 to early 1984). This quadruples the bearing’s load surface. Worn bearing surfaces on the clutch hub and basket are a thing of the past. Using the bearing retainer plate included in the kit and the three snap rings, the bearing play is adjusted — a function originally performed by three conical springs (37574-44) and a steel plate (37576-41). Three different positions are available for adjustment. Thanks to the wider bearing surface, the clutch basket also wobbles less when the clutch is disengaged. Proper bearing play adjustment is only possible with clutch hubs that feature three threaded studs.

A design by Randy Smith, founder of Custom Cycle Engineering, who created it back in the 1970s. He allowed Chopper Dave to use his product as a pattern for these alternator covers with distinctive cooling fins. It is intended for cone motor bikes which run with an open primary.

Protects the alternator assembly on open belt drive set-ups.

Precision-machined transmission mounting plate with built-in dual adjusters. Ideal for use with open belt drives. Features three front mounting holes to match early and late frames.

Dual adjuster for 4-speed transmissions 1936-64 (tin primary) and 4-speed transmissions thru 1984 with open primary drives.

Carbon fibre lined clutch friction discs offer smoother engagement and control. This state-of-the-art material allows to run these discs in both dry and wet clutch/primary systems. Use as stock replacement for 1968→ clutch systems. With an extra steel disc the kit fits from 1941 onwards.