Scooterotica

is there a difference between a 2 stroke silencer & 1 on a 4 stroke engine? Are they interchangeable & if not can anyone explain the difference.

Yes there will be a difference 2T rely on back pressure forcing gases back into the cylinder, whereas 4t likes to have gases out as soon as possible easiest route, I expect someone on here will explain in detail.

Won't that be the pipes job, or does it incorporate the tail pipe as well.

The silencer on its own, and the exhaust as a whole, are both 2t or 4t specific. And every 2t silencer "should" be individual cylinder specific let alone 2t specific. Simon

Cheers, do you know the difference between a 2 stroke & 4 stroke silencer and can they be adapted. It Seems from reading a bit about it it's more about noise baffling, ie.packing or stinger.

Thats not that simple. In relation to an absorption muffler (silencer), although most 2T exhausts use a common ID per CC grouping, it's difficult to just say "A 125cc Vespa should have an ID of X".
I would work to a specific, calculated size per engine spec and allow a tolerance of +5% depending on stock material available, or make it. I wouldn't go under my desired calcs. An exhaust/ and or silencer can destroy an engine by being too big as well as too small an ID. When it's a mechanical muffler it gets more complicated but I think I'm the only person who uses/ makes them. Which from a manufacturing point of view, I fully understand as its fair critical to get internal flows/ lengths/ diameters right without destroying the engine. Hence the specific cyl. /port timing/area designated pipes I make.
Generally, a 4T muffler just needs to exit the exhaust and silence it asap. so ID/ flow is much bigger. The valve timings/ area play a big bigger part than the exhaust.