Chester362 wrote:
The picture I remember of standard MC21 chambers, showed they had a second 'jacket' welded over them. Possibly with some kind of sound deadening material in between too.
Anyway, the jacket was removed, which lightened the pipes.
Was it Bill Limb, or Lamb who did it? Perhaps Andy or Dave Ett can tell us.

I have those pipes... somewhere! They were done for testing purposes, to evaluate the stock chamber design in a "derestricted" form.

As far as I am aware, the MC21 and MC28 chambers are of similar design, but only one chamber has the perforations. However, both chambers are double-skinned. The perforated section was cut out, and a new piece of sheet let into its place. The pipes performed very well, with bags of mid-range and a healthy enough peak for a standard, delimited motor, but no real usable over-rev. We have seen close to 70hp with stock MC21 chambers though (on a far from stock bike!), but they are very very fussy to set up. The stock silencers are rubbish, and the MC28 items are even worse!

None of this helps with an MC28 though, or with chambers that are retaining water!

Best solution is to fit them to the bike and run it! Simple as that.
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Andy.
NSR-WORLD.COM

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