I'm rebuilding a ROG Pony Express with E50 engine (the same moped as the one in my profile).
The previous owner showed no mercy for it, and I found it in a pretty poor shape.
Now, I almost done with the rebuild. The last thing to mount is the exhaust. And that is where I noticed sth strange.
I noticed that something was loose inside and when opened it I found out that the header pipe that was welded to the curved exhaust pipe was broken and banging on the inside walls. The exhaust is not the typical Puch stock but something different.
It is shown here:
It can be opened only from the back where the baffle is.
I can not weld it since it very deep inside.
The question is:
What if I run the bike without the header pipe?
What will suffer? Speed? Noise? Up/down jetting?
Thank you all.