Crankshaft -BGM Pro HPC Competition 58mm stroke, 116mm conrod- Lambretta DL/GP 125cc, 175cc, 200cc, 225cc, 250cc for Quattrini M210

bgm PRO Competition Crankshaft 58/116 – ideal for Quattrini M210

The bgm PRO Competition crankshafts for Lambretta stand for advanced engineering and the highest manufacturing quality. With a 58 mm stroke and 116 mm conrod, this version is perfectly matched to the Quattrini M210 cylinder. Proven features remain – essential details have been specifically enhanced.

New features in detail:

• Precision-ground mating surfaces for maximum joint strength and twist resistance
• Newly coated, finely ground crank pin
• Forged 116 mm conrod with CNC finish
• Hardened and precisely machined bearing and seal surfaces
• Wider range of stroke and rod lengths for individual setups
• 100 % inspection by ISO and QC certified production partners

Retained design features:

• Full circle design for increased pre-compression
• Forged crank webs
• Excellent balance thanks to concealed pockets with copper and tungsten inserts
• Reliable lubrication via large oil holes in the lower conrod bearing
• Crank pin diameter: 22 mm

With over 15 years of experience and three more years of targeted development, the bgm PRO Competition series delivers. The 58/116 variant ensures maximum stability – tailored for high-performance Lambretta engines using the Quattrini setup.

Recommended by Mark Broadhurst, MB Scooters, February 2025:

“Today we have purpose made full circle cranks that are full circle made from solid metal, with various balancing pieces pressed in place to keep the higher compression and try to get a better smoother balance. (…) BGM got it right, they were super tight, so tight they take 15 tons to press together, moving them is very difficult and it is full circle and balanced very well – these are our go to crank – when available!”

Source: mbtechsite.co.uk/portfolio-items/tuning-work-transfer-casing-tuning/

In the British BSSO racing series, Team Replay successfully relied on bgm components in 2018 – including the revised Competition crankshaft. Rider Darren Conneely secured 2nd place in Group 4.