Exhaust fitting question on PX200

[dDUBlya]

I bought a PM Tuning pipe and I cannot get the pipe to fit onto my exhaust stub on my PX 200 disc.
The stub is too wide. The dude sold me it off his 200.
I tried getting the exhaust pipe widened a little and it still won't fit.
Any ideas?

[cit205]

Have you got a standard barrel or is it an ali kit such as malossi or pinasco? Reason i ask is i'm wondering if you've got an ovulated/squashed stub which is easy to do on those by doing the clamps up too tight

[dDUBlya]

It's standard as far as I know. The stub is pretty round tho and is pretty thick so I doubt it is that.
The exhaust itself could be a bit off but it's a big difference.
Just wondering if the manifolds were made thicker on the disc models.
I'm a lambretta guy usually so I find it really weird it doesn't have a gasket and bolts onto the port.
The stub actually screws out which I cant see being a good seal.

[rapido230]

did the exhaust come off a malossi kit or another ali barrel? i've seen on a pm pipe where the downpipe is slightly oval, due to someone tightening the clamp too much over time. Some ali barrels are very slightly smaller on the stub , so you might need to check downpipe on exhaust. i cured it with a tap or 2 with a hammer on the downpipe lol, then it slips on

[dDUBlya]

With much force and blattering it's on. I'm not happy about the amount of violence used in what should have been a much easier fit.
Now snag number 2 is the bloody centre stand. The pipe hits the tabs for the return spring.
Unless I drop the exhaust low enough which means I have to get a part made to extend the centre connector bolt.
My MB went on my GP like a dream too.

[rapido230]

on pm u have to move spring over and if i remember rightly

[cit205]

Yes there are other slots across that frame strut that you can move it to. The screw in stubs arent thicker on disc/late models and seal fine, they probably rust in on the iron barrels, that's how they seal high pressure steam boilers in a way, leave them outside to rust
The stub system only falls down if not screwed in properly and as i said before with the squashable and breakable aluminium stubs on kits.
Vespa T5's have the stud/flange system though. Just in case you wanted to know

[dDUBlya]

The entire stand had to come off. There was no way it was going on with it attached.
But it's all on now. Took it for a light run tonight and tomorrow I'll recheck all the nuts and bolts again before I hit it a bit harder.
Sounds very nice and seems to allow a bit more revving in each gear.
Also clears the spare easily enough too.

[dDUBlya]

Here it is.

[cit205]

You've probably already taken care of it ,but just in case you haven't ..that will need quite an upjet with a pipe like that and maybe the timing backing off a little ,assuming everything else is standard.