When you build up the bgm crank the standard small end bearing 20 m/m width into the conrod the needle roller ends show each side of the conrod eye! is this to have needle rollers the full width of the small-end eye or for lubrication straight into the open end of the bearing? it just looks alittle strange

This is how Yamaha do them, used them for 30 years with no issues. Will be fine.

Hi, I'm buying up the parts to build an RT 195 engine. What benefit is there to using the 60/110 crank over the standard 58/107?

It should produce more power, but you have to set the port timings so its a bit more complicated. 58mm is a straight fit and it is easy to set up

I bought this crank from jet 200 here in the states. they lost the instructions wondering if you had a copy of them. you could scan and email to me. if not cheers

Look here http://www.lambrettaspares.com/info/lambretta-setting-up-instructions-/bgm-product-fitting-instructions+155.html

Hi Mark, Does the crankcase mouth need modification for the new type rod compared too the old yam rod. Regards Shane

No mods required the rod has been machined down

What is the purpose of the shims that come with the crankshaft?

In case the drive plate is high and crank rubs on the plate. Or just fit the MB drive plate and have done with it

Hi, can you please tell me if the cases need modifying to avoid the big end catching with this crank?

I've never had to modify a casing using them, but have heard one person doing it

Hi, Can you please tell me if this crank will fit without the big end catching the casings ?

Yes it should do on most casings, I've not come across one that needs altering but have been told some casings do need altering

Planning on doing a race tour kit with this crank. Could I substitute the two 3mm shims that come with this crank for two other sizes for a 200 case and if so how would I go about that? Thank you, Christian

Yes you could phone the shop to organise it

hi i want to use this crank with a Ts1-225 & to keep as std port timings. what size cylinder packer is needed please?

Port timings will alter with the longer stroke crankshaft. Packers depend on where you want the port timings and depends on the height of the casing. Usually we use 1.5 - 3mm packers

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Lambretta Crankshaft, 60 x 110mm, Gp, full circle, BGM

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£348.00 £290.00

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MBGM0241

Crankshaft, 60 x 110mm full circle, Bgm

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Questions (12)

Reviews 1

Full circle 60mm stroke, now comes with bgm manufactured con-rod, and using a bgm big end bearing and big end shims.

The crank is fully balanced to reduce engine vibration with tungsten weights.

Comes supplied with Yamaha small end bearing 16x20x20 for standard width pistons.

Bgm cylinder packer plates are also supplied with the crankshaft, 3.00mm for small block engines, and 3.00mm for large block engines

Head gaskets also supplied for BGM 195 and 225 kits 1 for each kit at 1.50 mm

BGM full-circle crankshafts are a go-to choice for Mark when building engines, thanks to their quality, tight construction and excellent balance. As Mark explains:

“Today we have purpose-made full-circle crankshafts that are made from solid metal, with various balancing pieces pressed in place to maintain the higher compression and achieve a 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 they are full circle and very well balanced – these are our go-to crankshafts when available!”

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