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A sorry looking BGM

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

A sorry looking BGM

Postby Tractorman » Sat May 06, 2017 4:57 pm

Sorry looking BGM.jpg


The combo starting to run badly and did not sound right on the way to Larling. This is why
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Re: A sorry looking BGM

Postby ToBoldlyGo » Sat May 06, 2017 6:03 pm

What have you done to it? :shock:
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Re: A sorry looking BGM

Postby Storkfoot » Sat May 06, 2017 6:13 pm

Did all the fixing points line up okay? Could it be that the swan neck attachment was under stress because it did not line up with the connections at the stub and tailpipe?
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Re: A sorry looking BGM

Postby Warkton Tornado No.1 » Sat May 06, 2017 6:36 pm

It would be interesting to gain the manufacturer’s opinion on the failure because the steel has fractured in a way that you would expect only high carbon steel could!

It appears brittle as if work hardened through heat, not strain, much like you might expect of cast iron...
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Re: A sorry looking BGM

Postby dickie » Sat May 06, 2017 6:43 pm

Mine did the same thing but on the underside of the box. It was under no stress at all but had been loose for about 100 miles.

It was nowhere near as bad as that and I managed to get it welded before it went completely.
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Re: A sorry looking BGM

Postby Watfordwhite » Sat May 06, 2017 8:43 pm

WOW. And you didn't notice to noise before hand?
I would say that's F*******d :shock:
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Re: A sorry looking BGM

Postby Topgearskin » Sun May 07, 2017 9:34 am

My first bgm clubman did a similar thing, after about 1000 miles

Image

Replaced by Scooter-centre, but disappointing considering. I was relieved I hadn't had it coated as that isn't covered in the Warranty. Anyone ever had this happen on an AF clubman?
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Re: A sorry looking BGM

Postby Storkfoot » Sun May 07, 2017 12:31 pm

I lost a tailpipe on a French motorway and, yes, in hindsight the steel did fracture in that sort of "sharp" fashion.

That said, whilst I had fettled the exhaust to suit a 115 conrod, with hindsight, there was still a pull on the tailpipe. Only slight though.

All welded up and still being used though.
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Re: A sorry looking BGM

Postby Watfordwhite » Sun May 07, 2017 5:12 pm

Don't say that Topgearskin. Mine has just gone on and cost a small fortune. TBH I am a closet MBD fan.
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Re: A sorry looking BGM

Postby lozmondo » Sun May 07, 2017 5:45 pm

Which version is it?
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Re: A sorry looking BGM

Postby Donnie » Sun May 07, 2017 7:38 pm

Bugger, will have to keep a close eye on mine!
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Re: A sorry looking BGM

Postby Topgearskin » Sun May 07, 2017 8:36 pm

lozmondo wrote:Which version is it?

The one that failed was (I believe) version two. The one I have now is version 3.
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Re: A sorry looking BGM

Postby dickie » Sun May 07, 2017 8:44 pm

Topgearskin wrote:
lozmondo wrote:Which version is it?

The one that failed was (I believe) version two. The one I have now is version 3.


Mine that failed that way is v3
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Re: A sorry looking BGM

Postby lozmondo » Mon May 08, 2017 4:10 pm

My original V1 has lastest very well, but the later versions seem to have had problems fracturing in various places.Hence the new design and manufacturer I guess....Just off to the post office to collect my V4 ...
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Re: A sorry looking BGM

Postby missing lynx » Tue May 09, 2017 12:32 am

looking at the pictures it's not a design problem but there being made with the wrong type of steel
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Re: A sorry looking BGM

Postby burnside » Tue May 09, 2017 8:50 am

That's a bit worrying, will have to check mine tonight (V2), mine is loud but put that down to the baffles being shot to pieces!
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Re: A sorry looking BGM

Postby NorthernJordan » Tue May 09, 2017 9:55 am

Topgearskin wrote:My first bgm clubman did a similar thing, after about 1000 miles

Image

Replaced by Scooter-centre, but disappointing considering. I was relieved I hadn't had it coated as that isn't covered in the Warranty. Anyone ever had this happen on an AF clubman?


yeah, I have... AF one disintegrated on the way to the IOW a couple of years ago. Tail pipe gone, main bracket gone and it was literally just hanging on by the studs!
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Re: A sorry looking BGM

Postby Topgearskin » Tue May 09, 2017 11:58 am

I've used AF clubman exhausts for years and never seen one go like this. I've had them have issues with age through rust, but never had one so new have a "terminal" failure. Worst I've experienced is the tailpipe bracket snapping on a twin pipe. Now I appreciate that they don't perform as well......
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Re: A sorry looking BGM

Postby St George » Tue May 09, 2017 4:59 pm

Makes me think that it is soft Chinese steel, there are exhausts on lambrettas 40 years and older still going strong. No disrespect meant to manufacturers.
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