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SOHC.co.uk Forums => CB650 => Topic started by: stesjh on December 31, 2017, 02:16:36 PM

Title: 4 into 1 Exhaust
Post by: stesjh on December 31, 2017, 02:16:36 PM

Hi guys, after a exhaust for my 1979 CB650. The one I currently have is fine but very load. Was wondering if I need to replace the whole system or whether I can just replace the end can? Not sure what make the exhaust is but someone may recognise it from the picture. Thanks in advance.

Title: Re: 4 into 1 Exhaust
Post by: hairygit on December 31, 2017, 03:27:26 PM

It doesn't look like there is an "End can" on it, looks like someone has just hacked the end off a Motad or similar! Are there any markings on the exhaust anywhere that you can see?

Title: Re: 4 into 1 Exhaust
Post by: stesjh on January 01, 2018, 12:55:24 PM

Thanks for the response. I have had a closer look and there doesn't appear to be any markings, therefore I am thinking that this probably is a 'homemade' system? Can anyone recommend where I could get a similar system?

Title: Re: 4 into 1 Exhaust
Post by: haynes66 on January 01, 2018, 01:58:38 PM

i have a 4-1 from a cb750f2 that i keep tripping over. if someone can confirm it will fit, you can have it.

Title: Re: 4 into 1 Exhaust
Post by: stesjh on January 01, 2018, 02:42:09 PM

That would be great - thank you, can someone confirm whether this would fit?

Title: Re: 4 into 1 Exhaust
Post by: hairygit on January 01, 2018, 03:28:28 PM

Probably not without a fair bit of cutting and welding. 750 engines are considerably taller than the 500/550/650 motors, so even if the downpipes fit the exhaust ports ((which I seem to remember they don't) the vertical drop from the exhaust ports is quite a bit longer, which could result in them grounding out on bumpy roads, not a good thing to have happen. Can you not fashion some kind of baffling/end can yourself from a similar diameter piece of tube/old exhaust?

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Title: Re: 4 into 1 Exhaust
Post by: haynes66 on January 01, 2018, 03:41:45 PM

thanks for that, hairy. anyone with an f2 want a free exhaust, send me a pm

Title: Re: 4 into 1 Exhaust
Post by: Green1 on January 01, 2018, 03:44:56 PM

You don't need much in the way of baffling to make a big difference. I bought a cheap nasty exhaust for the CG and it was far to load.
I cut the kitchen broom handle down and drilled a series of holes into it it now sounds stock.
Don't try it with a wooden handle as I don't think it will work as well. ;) 

Title: Re: 4 into 1 Exhaust
Post by: ka-ja on January 01, 2018, 04:08:52 PM

I cut the "silencer" off my 400/4 completely, then welded a reducing piece, example as below, into the exhaust stub with an end diameter suitable for a standard after market silencer, that allowed me to fit a silencer of my choice

       https://www.ebay.co.uk/itm/Exhaust-Adaptor-Reducer-Joining-Sleeve-Connector-Any-Size/111083884881?hash=item19dd1d9151:m:mQ99H13tztiRUc9RScusCMA