Scooterotica

So looking at Scooter Restorations site, they sell two types of big bore exhaust gasket. A normal shaped one:

http://www.scooterrestorations.com/lamb ... st-gasket/

And a rectangular one

http://www.scooterrestorations.com/lamb ... st-gasket/

Which is better The second costs more (only £2 but that's nearly double ) so I'm assuming it's better in some way?

the rectangular one is solid copper, the other is composite type. I am using a solid copper one, that I cut myself, on a nice flat exhaust flange to cylinder with no problems but you pays yer money and takes yer choice

Get the solid one. Fit and forget.
It wont crumble and blow your engine up at 1000 miles.

The solid copper one is reusable. Just anneal and re-use. I'd think they would be less forgiving if the exhaust flange is warped at all, where the fiber/copper one would have more give to it.

I couldn't get the solid one to fit/work as it needs heating up, even a grown up I asked had the same problem. I have an RT kit now and the fibre (?) ones that are supplied (4 hole) work well.

I have an standard big bore exhaust and use a fibre gasket from MB.If you use a solid copper gasket it may blow because the standard manifold flange can deform on tightening.

HxPaul wrote:I have an standard big bore exhaust and use a fibre gasket from MB.If you use a solid copper gasket it may blow because the standard manifold flange can deform on tightening.

I was originally was planning on fitting what I would call a cardboard (though I guess you could call it fibre) gasket but have been advised that these leak which is why I was looking at the copper ones. I then read about these on MB site last night after posting this topic. I'm assuming that, as they are MB, then these are some how better than the ones' I have???

Get the solid copper one. Anneal it with a blowtorch. When its cooled down, linnish it on both sides on some wet & dry taped to a piece of glass. Do the same to the exhaust flange on the U bend. That will give a perfectly flat mating surface. For belt 'n braces I smear a thin layer of HT silicon between all mating surfaces. Never had an issue.

dapper wrote:Get the solid copper one. Anneal it with a blowtorch. When its cooled down, linnish it on both sides on some wet & dry taped to a piece of glass. Do the same to the exhaust flange on the U bend. That will give a perfectly flat mating surface. For belt 'n braces I smear a thin layer of HT silicon between all mating surfaces. Never had an issue.

The problem I've found with filing/sanding the exhaust flange is,as soon as you tighten it up,it deforms.This is because the stud holes are so far apart and the flange is relatively thin.A fibre gasket tends to give a little to seal the gap.

I like the MB ones as they have the 4 holes so theoretically have more fitting combinations.
They do alloy and copper and both can be filed / dremeled to match ports and pipes.
Alloy ... http://www.lambrettaspares.com/spares/e ... b0808.html
Copper .... http://www.lambrettaspares.com/spares/e ... b0809.html