Completely assembled gearbox (drive shaft, gears, shift cross) -BGM PRO- Vespa Largeframe (1984-) - PX Lusso, Disc, My, 2011, Cosa, T5 125cc, LML Star 2-stroke, Stella 2-stroke - 12/57, 13/42, 17/38, 21/36 teeth - short fourth gear

BGM Pro gearbox for Vespa Largeframe engines

Product description

• Completely assembled and spaced out gearbox - ready for immediate installation
• Specially developed for Vespa largeframe engines
• High-quality gears made from NiCrMo case-hardened steel (20NiCrMo2-2 / AISI8620) for maximum durability
• Surface hardening (58-60 HRC) for high durability and minimal wear
• Ideal for powerful motors

Areas of application

• For standard engines, touring drivers and racing enthusiasts
• Version with PX200 gradation, but with the shorter 4th gear of the PX125 model
• Smaller gear jump between 3rd and 4th gear for better power delivery
• Also ideal for touring riders in combination with extended primary reduction => Reduces revs at high cruising speeds

✅ Suitable for

• PX Lusso (from 1984)
• PX Disc, MY, 2011, T5, Cosa
• LML Star 2T & Stella 2T

The Lusso gearbox is characterized by two snap rings on the main shaft and a flat shift cross. It offers a wider contact surface in the middle segment and is considered to be more stable than older versions.

Conversion of older models

• PX engines with gearboxes up to approx. 1983 can easily be converted to the Lusso gearbox
• The mainshaft offered here is fully compatible
• Recommended: Simultaneous change to the more stable brake drum of the PX Lusso models (30 or 31.5 mm shaft seal diameter)

⚙️ Special cases

• PX80, P125X, P150X
• Older PX 125/150 models use the gearbox type of the Vespa Sprint
• PX80 models have their own gearbox type
• The main shaft offered here fits without any problems, but requires a suitable auxiliary shaft ("fir tree")
• Important: Ensure a compatible auxiliary shaft axle and brake drum mounting

Helpful tips

Determining the gearbox type

• PX old (up to 1984, cranked gear cross): 5 mm
• Lusso (from 1984, flat gear cross): 6.5 mm
• BGM gear wheels: +0.1 mm for additional contact surface

The gears are marked with a "TOP" mark, which must point towards the gear shift notch during installation. The installation clearance between the gears and the shoulder ring is already set(0.15-0.35 mm).

⚠️ Important information for changing the gear shift spider

• The shift bolt has a left-hand thread
• Loosen in a clockwise direction

Manufacturer information

bgm
Kurt-Schumacher-Straße 1
50129 Bergheim, Germany
www.scooter-center.com
info@scooter-center.com

Person responsible for the EU

Scooter Center GmbH
Kurt-Schumacher-Straße 1
50129 Bergheim-Glessen, Germany
www.scooter-center.com
info@scooter-center.com