SOHC.co.uk Forums > CB750

K2 4 into 2 exhaust (DIY)

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Chris400F:
Here's a thought ....
Where does the collector box for your system sit relative to the centreline of the bike i.e. is it about in the middle or offset to one side?
If it is roughly central would it be possible to modify the collector box to add another outlet pipe on the other side to the existing one?
This would give you a 4-1-2 system which could then be fitted with the twin silencers (or mufflers) you presumably desire.
From the pic of a collection of parts it is difficult to visualise how the complete system would look when fitted to the bike.

El__burro:
Good thinking Chris.
I guess it's time to fit it and see.
El__burro

Rob.b (Rob Birkett - RIP):
HI,

It's a pound to a penny bet that your collector is going to exit on the right hand side of your bike.  I think it is going to be really difficult to adapt the collector so that it can accommodate a 4 into 2 system.  However, having looked at the collector it seems to have a wide and roughly symmetrical layout for receiving the 'down pipes', so for what its worth here is my suggestion; Don't bother with the collector and cobble up something using your set of 'downpipes' and off the self parts, I have added a photograph of what I managed to make at home using my own 'downpipes' and parts from:

http://www.classicbikeshop.co.uk/

It took quite a bit of head scratching but I'm happy with the result. Not Cheap though I spent about £225 on it.

here is my 500

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Rob

El__burro:
most probably you are right about the collector being located on the centre-right of the bike, I am trying to see if the downpipes I have can be diverted to 2 per side  without much struggle.
Your bike looks great and this is exactly what I am trying to achieve. (4-4) Just thought it will be easier getting to a 4-2.
Thanks for your suggestions,
please keep them coming.

el__burro

matthewmosse:
I think 4 into 4 would actually be easier but cost more - 4 silencers not 2. I would think probably the 2 left pipes would need cutting and welding, or bending ( probably with heat ) to point over the other way, and I'd anticipate them having a bit of extra length needing trimming off that side as the'd no longer cross the bike. Then there is the issue of getting it chromed or painting or avoiding chrome dammage when bending. Not inpossible - I think I would start by trying to clamp the engine end of the right hand pipes in a massively strong vise using substancial and shaped to suit soft jaws made of a hardwood like oak then inserting a tight fitting bar or pipe with plenty of length and swinging on it . This was something I had thought about doing in the past and I might well revist over winter or spring if I embark on a cb500 project. My starting point would be a motad 4 into 1 system with a rotten silencer. The 'fun' bit will be measureing the length of all the downpipes and angles when on the bike to see how much bending or cutting and welding is needed.

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