Clutch Kit LF 8-inch - BGM Pro Superstrong 2.0 CR80 Ultralube SPORT Aluminum 23/62 (2.70) Straight-Tooth - Vespa Large Frame VNA, VNB1T (-M68988), VBA (-M124018), VBB1T (-M9224), VGLA, VGLB, VNC (-011000)

BGM PRO Superstrong Clutch Kit 23/62 – Vespa Large Frame 8-inch

The balanced gear ratio for high-performance touring engines based on an 8-inch frame. This complete conversion kit combines the BGM PRO Superstrong 2.0 SPORT CR80 Ultralube clutch with a straight-toothed 23/62 primary drive and matching clutch cover.

With a gear ratio of 2.70, the primary drive is approximately 13% longer than the stock 22/67. This reduces the engine speed in all gears while maintaining the same driving speed.

The 23/62 is particularly well-suited for classic two-channel rotary-slide engines built with a modern 177-cm³ cylinder, a matching crankshaft, and a high-performance box exhaust system.

It offers a good balance between usable acceleration and a longer overall gear ratio without making the engine excessively long.

Technical Specifications

What's Included

• BGM PRO Superstrong 2.0 SPORT CR80 Ultralube Clutch, 23 teeth
• BGM PRO Clutch Cover
• BGM PRO primary sprocket, 62 teeth, straight-cut
• BGM PRO Primary Repair Kit, including reinforced shock absorber springs, cover washers, and rivets
• BGM PRO Clutch Washer

Heavy-duty clutch and complete primary overhaul

The Superstrong 2.0 SPORT CR80 uses aluminum friction plate carriers with sintered linings and 16 mm wide driver tabs. The torsionally rigid CNC-machined clutch basket ensures precise power transmission and clean disengagement.

Ultralube technology improves oil supply to the hub profile and clutch plates. The included clutch cover provides the necessary installation space for the larger clutch.

With the primary repair kit, which is also included, the wear parts of the shock absorber can be replaced at the same time during the conversion.

Compatible Vehicles

• Vespa VNA
• Vespa VNB1T up to engine number M68988
• Vespa VBA up to engine number M124018
• Vespa VBB1T up to engine number M9224
• Vespa VGLA / VGLB (T/4)
• Vespa VNC up to No. 011000

Frequently Asked Questions (FAQ)

Is 23/62 long enough for a 177-cm³ engine?

For many street-oriented 177-cm³ engines, this combination offers a well-balanced overall gear ratio. The key factors are torque curve, gear ratios, and actual wheel diameter.

How does the 23/62 differ from the previous 23/63?

The new version has a 1.61% longer reduction ratio. The primary ratio changes from approximately 2.74 to 2.70.

Does the engine need to be opened for installation?

Yes. The original primary sprocket is replaced with the straight-toothed BGM PRO version with 62 teeth. To do this, the engine case must be opened.

Can the gear ratio be increased later?

Yes. With a compatible BGM clutch pinion with 24 or 25 teeth, the gear ratio can be further increased while retaining the 62-tooth primary sprocket.