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Exhaust sealant

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

Exhaust sealant

Postby Knowledge » Fri Jan 09, 2026 12:25 am

My slip joints leak on my expansion pipe (TSR Evo).

Is there a flexible sealant that can be used on slip joints in these challenging locations?
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Re: Exhaust sealant

Postby nickw » Fri Jan 09, 2026 10:33 am

Hi Martin, hope all is well in the sunny south. Is this what you are after. I remember these type of slip joint rubbers were doing the rounds when I had a TSR Evo. This link is an example, I think I got mine from JB Tuning
https://www.ebay.co.uk/itm/357597185051 ... _MQAvD_BwE
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Re: Exhaust sealant

Postby vegansydney » Fri Jan 09, 2026 6:17 pm

I've been using 100% silicon sealant on my exhaust joints for years, as have a number of friends. It's flexible, cheap and widely available. If it's good enough for professional MX racers, it's good enough for obsolete Italian shopping bikes :D
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Re: Exhaust sealant

Postby Toddy » Fri Jan 09, 2026 8:02 pm

vegansydney wrote:I've been using 100% silicon sealant on my exhaust joints for years, as have a number of friends. It's flexible, cheap and widely available. If it's good enough for professional MX racers, it's good enough for obsolete Italian shopping bikes :D


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Re: Exhaust sealant

Postby Knowledge » Sat Jan 10, 2026 1:11 pm

nickw wrote:Hi Martin, hope all is well in the sunny south. Is this what you are after. I remember these type of slip joint rubbers were doing the rounds when I had a TSR Evo. This link is an example, I think I got mine from JB Tuning
https://www.ebay.co.uk/itm/357597185051 ... _MQAvD_BwE


Hi Nick.
I am trying to seal at the header end of the pipe, but thanks for the link. M
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