SOHC.co.uk Forums > CB750

K2 4 into 2 exhaust (DIY)

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Chris400F:
The downpipes in the pic all look to be about the same length and the collector exit pipe has quite a bend in it, which is what suggested to me that the collector may be located centrally(ish) under the engine and that it may be possible to add another exit pipe and a second silencer. You still have the issue of fabricating suitable changes to the collector box and bending an exit pipe, but not impossible and working with what you have.

If you want to go down the 4 pipe route DK have listed in their online spares shop something described as 'Honda CB750 CB 750 SOHC 4x Finned Exhaust Collars & Header Exhaust Inserts ', see http://www.dkmotorcycles.com/used-spares/headers,_manifolds_and_studs_1/243128/. The accompanying picture shows a set of downpipes; if these are for a four pipe system then that would seem to be a good starting point for a 4-2 or 4-4 system.
 

El__burro:
Today I've managed to set the 4 pipes to see if this "job" can be done.
To this stage I am concerned with how little floor clearance there is.
Is that ok?
By looking at other set up I think its  too low.

Thanks
el__burro

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

Yes they look too low, they are going to ground. I reckon that  it's going to be far too much hassle to make them work.  Best bet is to follow the advice of Chris400f and buy a set of standard four into four down pipes to use as a basis. You can sell your four into one setup to offset the cost.

Go for it.   

Rob

El__burro:
Yeah, I thought so.
rather than spending over £100 for the pipes, I am thinking of trying to make them myself.
I found some material on ebay and some tutorials on YouTube.
I have worked out that (if successful) I will be spending less than £100,
learn something new in the process and eventually make some more to sell later on.
Has anyone ever tried to do this?
Thanks
el__burro
https://youtu.be/utkQf454ibQ

royhall:
That guys a real expert. I have tried that technique a few times (not exhaust pipes though) and it takes expertise to not have the pipe necking down and making it oval. For what I was doing the ovality wasn't important, but it would look a mess on a bike. If you can find a local company with a mandrel bender, that's the way to go.

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