Air leak.

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
User avatar
ove
registered user
Posts: 230
Joined: Fri Apr 10, 2009 11:02 am
Location: King`s Lynn
Contact:

Mon Oct 23, 2017 12:55 am

Hello found a air leak from exhaust stub it's only a small pin hole where it's not welded fully. Question is would some JB weld do the job and hold given that the temperature would be very high? Or would you recommend something other method i.e. Get somebody to weld it correctly?
Oh it's a Franspeed stub.

Cheers ove

User avatar
HxPaul
registered user
Posts: 1092
Joined: Fri Dec 06, 2013 1:58 pm
ebay user ID: panhead_5
Main scooter: lambretta Li 150
Location: Halifax,Yorkshire
Contact:

Mon Oct 23, 2017 10:29 am


User avatar
hungdog
registered user
Posts: 229
Joined: Wed Sep 16, 2009 2:57 pm
Contact:

Mon Oct 23, 2017 2:24 pm

Yep JB weld will do that , had it in my transfers on p2 casing for last 9 years still as go as new.

holty
registered user
Posts: 880
Joined: Wed Jul 15, 2015 11:52 pm
ebay user ID: amholt123
Main scooter: lambretta gp
Location: east yorkshire
Contact:

Mon Oct 23, 2017 2:59 pm

i would get the area clean and use a bit of exhaust putty, it will withstand the high temperatures of an exhaust manifold.

User avatar
Monty
registered user
Posts: 507
Joined: Wed Jan 07, 2009 7:21 pm
Main scooter: Series 1 Muggy, Imola Special
Location: STOCKPORT
Contact:

Mon Oct 23, 2017 9:07 pm

If it's a stub and slip joint I have never found these to be worth worrying about. The slip in joint is not air tight but I would normally fill the joint with silicon. Stub to barrel yes. Or am I missing something

User avatar
ove
registered user
Posts: 230
Joined: Fri Apr 10, 2009 11:02 am
Location: King`s Lynn
Contact:

Tue Oct 24, 2017 2:45 am

Cheers for all the replies.

User avatar
coaster
registered user
Posts: 3690
Joined: Wed Jan 07, 2009 12:35 pm
Location: London and Norfolk
Contact:

Tue Oct 24, 2017 4:00 pm

I found a leaky weld on my new BGM stub whilst doing a leak down test. I managed to seal it by re-welding (took me 3 attempts).

JB weld will be useless on the exhaust as it is outside its heat range and I wouldn't personally trust silicon or exhaust putty for any kind of permanent repair.

That said, if it is a tiny leak then it probably won't make any difference providing you get the jetting set up properly.

Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: No registered users and 21 guests