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Gearbox (gear cogs incl. drive shaft) -BGM PRO- Vespa PX EFL, Disc, My, 2011 (1984-) - PX125 (VNX2T 232053-, ZAPM), PX150 (VLX1T 624602-, ZAPM), PX200 (VSX1T 315267-), Cosa, T5 125cc, LML Star 2-stroke, Stella 2-stroke - 12/57, 13/42, 17/38, 21/35 te
Part no.:
BGM6935LK
Description
BGM Pro Transmission for Vespa Largeframe Engines
Product Description:
The fully assembled, precisely spaced, and ready-to-install transmission from BGM Pro is specifically designed for Vespa Largeframe engines. The gear wheels are made from high-alloy NiCrMo case-hardened steel (20NiCrMo2-2 / AISI8620), making them exceptionally durable. Thanks to the defined surface hardening (58-60 HRC), the pinion remains long-lasting and wear-resistant-ideal for high-performance engines.
Applications:
This transmission is suitable for all types of use, whether for standard engines, touring riders, or racing enthusiasts. The version offered here features the PX200 gear ratio but with the first gear being one tooth shorter, similar to the PX125 models.
This modification reduces the gear jump between 3rd and 4th gear, allowing the engine to stay within its power band more efficiently. This variant is also interesting for touring riders when combined with a longer primary transmission ratio. In this setup, gears 1-3 can be extended further while still maintaining an excellent transition to 4th gear. This keeps engine RPMs lower even at higher cruising speeds.
Compatible with:
- PX EFL (from 1984)
- PX Disc, MY, 2011, T5, Cosa
- LML Star 2T & Stella 2T
The EFL transmission (from approx. 1984) is characterized by two circlips on the main shaft and a flat shift cross. It is considered more stable than older versions due to its broader contact surface in the middle section. For engines with 25 HP or more, the EFL transmission is recommended.
Conversion for Older Models:
PX engines with transmissions up to around 1983 can be easily converted to the EFL transmission. The main shaft offered here can be fully adopted. Ideally, it is recommended to switch to the more stable brake drum of the PX EFL models at the same time, which has an oil seal diameter of 30 or 31.5 mm.
Special Cases:
PX80, P125X, P150X The early PX 125/150 models still use the transmission type of Vespa Sprint engines. Similarly, the PX80 models were equipped with their own transmission type.
However, the complete main shaft offered here fits these engines without issues and only needs to be paired with a matching secondary shaft ("Christmas tree"). It is important to ensure the correct secondary shaft axle and brake drum mounting.
Helpful Tips
Identifying the Transmission Type:
To identify loose transmission gears, simply measure the middle section:
- PX old (until 1984, bent shift cross): 5 mm
- EFL (from 1984, flat shift cross): 6.5 mm
- BGM gear wheels: +0.1 mm for an additional contact surface
The gear wheels are marked with a "TOP" marking, which must face the shift selector during installation. The play between the gear wheels and the shoulder ring is pre-adjusted and should be set with a feeler gauge to 0.15-0.35 mm.
Important Note for Replacing the Shift Cross:
The shift bolt has a left-hand thread and is loosened counterclockwise.
Manufacturer Information:
bgm
Kurt-Schumacher-Straße 1
50129 Bergheim, Germany
www.scooter-center.com
Email: info@scooter-center.com
Responsible Person for the EU:
Scooter Center GmbH
Kurt-Schumacher-Straße 1
50129 Bergheim-Glessen, Germany
www.scooter-center.com
Email: info@scooter-center.com
This item is currently not available.
€370.99 *
incl. VAT plus shipping costs
The item is ordered and will be in stock soon
P
For this item you get
fidelity point/s
| Gear box (classic scooters) | |
|---|---|
| number of teeth 1st gear: | 57 |
| number of teeth 2nd gear: | 42 |
| number of teeth 3rd gear: | 38 |
| number of teeth 4th gear: | 35 |
| type of teeth: | straight |
Please inform me once the product is available again.
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