BGM6401N Archive - Scooter Center Scootershop Blog

How to get the Lambretta gear changing work perfect and smooth?

We take a close look at the controls and what can be done down from the headset thru the cables to the gear swivel and gear selector arm on the engine casings.

Let’s face it the last Lambrettas have left the Innocenti factory half a century ago. And not everyone has been maintained and serviced regular and as it should be done. One of the many beauties on the Lambrettas is that they are very simple to work on, especially with the right tools, right parts and the right hints (Sticky). There are three areas to look at:

Handlebar / headset
Cables
Engine casing

Lambretta handlebar / headset

Thru the Li family there had been different changes on the internals of the headset. On well- maintained bikes most of the time taking everything apart, cleaning and put it properly greased and lubricated can do the job. When you are up the job, it won’t do no harm to renew all the bushings in the headset. These are the guides for the gear and throttle rods. Available as handy sets from Casa Lambretta:

Li Tv Series 1 and 2: https://www.scooter-center.com/product/8800050
Series 3 up to 1965: https://www.scooter-center.com/product/8800051
Series 3 from 1965*: https://www.scooter-center.com/product/8800052

*also dl / GP range

If you need additional spares a nice way to find them are our exploded views, that are online for all Lambretta scooters. Here you see the dl / GP headset:

https://www.scooter-center.com/en/innocenti-lambretta-gp-200-dl-200/exploded-views/handle-bar-speedometer

Once everything is properly rebuild and any slack is taken out –especially of the gear change housing and the gearchange rod- you are done with the headset and can have a look at the cables.

Lambretta cables and routing

Essential are Teflon / PTFE lined cables. These run super smooth and are maintenance free. The bgm cable sets are especially made for the Li family Lambretta and have some unique features. The right inner and outer cable lengths are granted. Here you find additional info about how good these are: https://blog.scooter-center.com/en/cable-sets-bgm-pro-for-vespa-and-lambretta/. Back to the plot: Once you have routed the outer cables in the right way as can be seen on the bgm’s fitting instructions:

Cable set bgm PTFE inner liner- Lambretta DL, GP | BGM6401N
Cable set bgm PTFE inner liner- Lambretta LI, LIS, SX, TV (Series 2-3) | BGM6400N

https://www.scooter-center.com/media/pdf/20/9a/2c/Einbauanleitung_c80.pdf

It’s time to fit the inner cables. On the brake and clutch levers use a good blob of grease to keep everything well lubricated. Especially the lever screw, the trunnion of the inner cable and all operating and moving parts.

https://www.scooter-center.com/product/8008200

https://www.scooter-center.com/product/19062019

https://www.scooter-center.com/product/19062021

A run-down of the inner cables with Teflon spray does no harm and especially the operating of the clutch is much more easy:

https://www.scooter-center.com/product/G280512

Topp Tipp: If the bolts of the clutch and brake lever are not properly greased they can wear off the holes in the light switch housing and gear change housing. These can easily been repaired with the oversize bolt:

https://www.scooter-center.com/product/8900009

Lambretta engine casing

The most important thing is to avoid any unwanted slop in the gear swivel, tie rodgear change and the the selector arm. Luckily there are many different choices for everyone’s tasting available.

Selector Sets

Like the made to original specs Casa Lambretta gear selector set:

https://www.scooter-center.com/product/7676338

Or the high grade CNC machined set from bgm Made by JPP Tuning for us:

https://www.scooter-center.com/product/BGM2290B

https://www.scooter-center.com/product/BGM2290

Trunnion Sets

Paired with the bgm trunnions you really have a perfect and long lasting set:

https://www.scooter-center.com/product/BGM6466

This is the full bgm trunnion set:

https://www.scooter-center.com/product/BGM6465

Lambretta Tool & Tool bags

For sure the bgm trunnions have the original 3.5 mm allen key size as found on original machines as well as on original toolbags supplied with your brand new scooter:

https://www.scooter-center.com/product/3331475

https://www.scooter-center.com/product/8050083KT

Something we went not original is the allen key for adjusting these. The bgm one comes with a ball end. This makes adjusting the gear change trunnions a cakewalk as you come across the clutch cable easily:

https://www.scooter-center.com/product/BGM6466TL

Topp Tipp: For all the rusteration freaks out there that want to keep their Lambrettas as original as possible we have over size trunnions made for preserving worn out gear swivels:

https://www.scooter-center.com/product/BGM6466P

The oversize makes the trunnions fit perfectly in used gear swivels. If necessary, grind out new shifting paddles minimally.

These compliment perfectly the inner cable sets:

http://www.scooter-center.com/product/BGM6400UI |https://blog.scooter-center.com/vespa-lambretta-zugsatz-set-fuer-unterwegs/

Lambretta Racing

We supply a selection of our high-quality BGM PRO Lambretta products to the Casa Lambretta Racing Team of Vittorio Tessera.

The racing team is very successful and currently scores wins all across Europe. We are glad to be allowed to contribute with our BGM parts. The following parts are fitted in the racing Lambrettas:

BGM PRO products

Rear shock absorber -BGM PRO R12 V2 Black Edition, 300-310mm- Lambretta LI, LIS, SX, TV (series 2-3), DL, GP – black, item number BGM7772
Most current version of the Lambretta BGM shock absorber. In comparison to earlier versions, this has been further optimised.
The greatest novelty being the height-adjustment of the shock absorber of up to 10 mm. Thus making it possible to generate more space between frame and intake.
New features:
– Bushes supported with silent rubbers
– Progressively wound spring
– Rebound and compression damping with marks hard -> soft
– Length-adjustment of up to 10 mm
Proven features remained the same:
– Massive 14 mm piston rod
– Spring preload adjustment
– Massive CNC body, anodized

Clutch -BGM PRO Superstrong 6 discs, 10 springs- Lambretta LI, LI S, SX, TV (series 2-3), DL, GP – 47 teeth, item number BGM8011NR47
The BGM PRO Superstrong Lambretta clutch is the plug & play solution – Made in Germany.
The entire clutch has six BGM PRO clutch plates, ten springs, which have been designed just for this clutch, and 1.5mm steel discs. The clutch fits like plug & play without spacer or other fiddling.
The surface of the six discs in connection with the supplied springs was manufactured to transfer torque of 60Nm. We also offer softer springs for moderate setups.
You want to use other springs? Please consider that their block size shouldn’t exceed 15mm. All CNC manufactured parts of the clutch are made of 42CrMo4.

Clutch springs -BGM PRO- Lambretta LI, LI S, SX, TV (series 2-3), DL, GP – hard (5.5 coil) – 10 pieces, item number BGM8010FX
BGM PRO clutch springs are made in Germany and are subject to repeated quality checks. Made of Oteva70®, stable and true to scale. There is no lateral deflection before the spring blocks. It goes back to the original length when unloaded. The clutch spring keeps its full elasticity. The spring constant is significantly tighter than the original spring constant. Perfect for tuned engines.

Clutch plate set incl. steel discs -BGM PRO Superstrong Racing Red- Lambretta LI, LIS, SX, TV (series 2-3), DL, GP – 6 discs, item number BGM8006KT
BGM PRO Superstrong clutch plates version “Racing Red” are in the top ranks of high performance plates. The organic plate blend is made for high pressure and high temperatures in racing and therefore highly loadable. The high quality plate material is thinner than the usual cork. This allowing the assembly of an additional drive plate in the entire Racing Red plate set.

Cable set -BGM PRO- Lambretta DL, GP, item number BGM6401N
Revised version of the proven Lambretta BGM PRO cable set. Well-known features, like correct length of inner and outer shells, outer cable with PFTE sleeve for easy use and detailed plan to lay cables obviously haven’t changed. Improved details are new. Like double pressed cable end sleeves or inner cables, which last longer. Cables for clutch and front brake now come with inner cables with cable barrel. This takes quite a bit of strain off the cables at the lever, making torn clutch cables a thing of the past.The set contains the following cables: Gears (2x), clutch, front brake, rear brake, throttle cable, additional long inner gas cable to use with larger carburetors, choke cable and solder fitting to adjust length to non-original carburetors.

Clutch bush -BGM PRO- Lambretta LI, LI S, SX, TV (series 2-3), DL, GP, item number BGM8010B
The BGM PRO clutch bush is another innovation in clutch technology for Lambretta. High-quality, special material always stands for perfect gliding behaviour. The bush allows smooth disengagement behaviour of the clutch, perfecting your start and resulting in a clean engagement without jolts even for high performance engines. The BGM bush is made of special material (use with a bit lubricant only) and precisely made of one block.
– Special material for high loads
– Made in Germany
– Smooth disengagement behaviour of the clutch
– Start without jolting
– Circumferential lubrication groove
– Fits Lambretta LI, LI S, SX, TV (series 2-3), DL, GP

Video Lambretta Racing

Photos Lambretta Racing

Posts

Lambretta gear changing cable routing & trunnions

How to get the Lambretta gear changing work perfect and smooth?

Lambretta handlebar / headset

Lambretta cables and routing