Very few of us, not being engineers, really understand the "pulse" and the needed
backpressure to make a 2 stroke work to maximum advantage. I'll stick with the
manufactures "pipe" and those of trusted aftermarket suppliers to know the
engineering. I remember fitting a vacuum cleaner hose as an exaust to my Cushman
scooter, only to throw a rod, break the camshaft and really trash the
machine.....but it did sound good on that last run....
"K. Brant Niggemyer" wrote:
> > Hi
> > What do you mean by the header?
> > I mean the point where the exaust system first bolts on to the manifold.
> > > It is normal to have a 10 -15 mm outlet at
> > the end of the pipe.. while at the beginning / manifold / cylinder port it
> > is 20-28mm diam.. is usual.
> > Exactly. The exhaust manifold has a diamater of about 25 mm. But the pipe that
> bolts on is about 10mm -- where it meets the manifold. So you see what I mean
> when I say the header is small.
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