SOHC.co.uk Forums > CB750

Can you modify a Motad system?

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roo:

Does anyone know if it's possible to put another (louder) can on the std Motad downpipes?

Failing that, has anyone stripped out the baffles, or modified them, successfully on this type of pipe? I'm tempted to get the angle grinder out and see what happens but thought I'd ask first ;D

SteveD CB500K0:
I've drilled holes in the end of a Motad on a 750F1. Motad agreed that it would improve the sound.

My 500/4 "Silver Machine" has Motad header with a home-made can grafted on.

roo:

That looks good - I was thinking about something similar, maybe grafting on a goldstar type silencer?

Will try drilling it out first. Did you drill through both baffles? i.e. front and back, or just the one that can be felt if you stick your finger in it  :o

florence:
I drilled holes in the end of my motad when I had one; It certainly helped a bit.

However, when I changed to my laser pipe I was amazed how restrictive the Motad had been, particularly in the lower end of the rev range.  With bigger jets and after market air filters and a better exhaust there is definitely more power to be had but it does take three kicks to start up whereas before it would start after one.

Many years ago, on my CX500 I made a two into one system using flexible exhaust pipe from a tractor shop and a BSA Goldstar exhaust.  Sounded great and worked wonderfully.

If you do modify an exhaust it is worth making carefull test runs to make sure the engine does not get too hot and experiment to get the jetting right.

SteveD CB500K0:
It wasn't very scientific (or even very neat). We just drilled holes in the end of the silencer.

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