Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: El__burro on May 08, 2016, 12:17:14 AM

Title: 4-1 to 4-2
Post by: El__burro on May 08, 2016, 12:17:14 AM

Good morning,
a very simple question,
is it possible to adapt this 4-1 (photo below) into a 4-2.
I really like the look of the exhaust on both side but cannot effort a 4-2 or 4-4.
Thanks
el__burro

(http://uploads.tapatalk-cdn.com/20160507/aca86fc42b42333799afb9b366031482.jpg)

Title: Re: 4-1 to 4-2
Post by: El__burro on May 09, 2016, 10:22:40 PM

any idea anyone?

Title: Re: 4-1 to 4-2
Post by: mick on May 09, 2016, 10:30:27 PM

Anything is possible with some patience and a welder  ;) cheers mick.

Title: Re: 4-1 to 4-2
Post by: Johnwebley on May 09, 2016, 10:42:56 PM

to get the best effect,and most efficient breathing,ideally link 2 and 3 ,and 1 and 4,


it might make the pipe work complicated,

Title: Re: 4-1 to 4-2
Post by: Honda Al on May 10, 2016, 08:08:10 AM

I know you mentioned cost, but have you seen the Marving 4-2 system? I bought one because the exhaust the bike came with was horrendous. It fitted well and looks quite smart with the pipes going each side of the bike.

Title: Re: 4-1 to 4-2
Post by: Greebo on May 10, 2016, 10:09:39 AM

I bought mine from here ...Version#4 retro dunstall...they sound terrific

http://www.cyclexchange.net/Honda%20SOHC%20High%20Performance%20Exhaust%20Page.htm

they worked out with delivery at £485.00 ish....well worth it if you can get the cash together

Title: Re: 4-1 to 4-2
Post by: Trigger on May 10, 2016, 08:12:52 PM

Maybe worth contacting James H as he must have shed loads by now.

Title: Re: 4-1 to 4-2
Post by: El__burro on May 10, 2016, 11:59:26 PM

James H ?

Title: Re: 4-1 to 4-2
Post by: Nurse Julie on May 11, 2016, 08:08:14 AM

James_Sussex

Title: Re: 4-1 to 4-2
Post by: El__burro on May 11, 2016, 12:10:15 PM

Thanks,
can 1976 exhaust fit 1972 bike?

El__burro

Title: Re: 4-1 to 4-2
Post by: El__burro on May 12, 2016, 09:35:50 PM

Anyone?

Title: Re: 4-1 to 4-2
Post by: K2-K6 on May 12, 2016, 10:03:28 PM

Mostly I think they'll all fit each other, some of the later (F2) use a different head fitting arrangement but can be swapped over just by using the correct parts.

So for example 1976 K6 will fit 1972 K2 if that's what you've got available.

Title: Re: 4-1 to 4-2
Post by: El__burro on February 13, 2017, 01:47:38 PM

catching up on this "project "
I have managed to make the 4-2 system using som cb parts and a Y piece from another vehicle.
the result is not bad.
to improve it I need to relocate the side stand SPRING.
I've tried a few options but unsuccessfully.
can anyone help me with this?
the spring touches on the y piece and i guess it will damage on the long term.
Thanks
el__burro

Title: Re: 4-1 to 4-2
Post by: Mag1 on February 13, 2017, 08:14:38 PM

Does it just touch it and no more or does it interfer with the actual branch of the exhaust. The most important thing is does the stand move completely out of the way while on the move in its full tucked away position?.

Title: Re: 4-1 to 4-2
Post by: El__burro on February 15, 2017, 02:32:42 PM

the spring was touching the collector pipe, i am sure within a year of using the side stand it would have damaged it.
i fixed it by welding a support on the back of the existing one and another one on the back of the stand itself.
i'll upload pics soon.
In the meantime i am sharing the final result.
What do you think?
(https://uploads.tapatalk-cdn.com/20170215/b5528bdf0d99ed0234527d3042848b31.jpg)(https://uploads.tapatalk-cdn.com/20170215/6daa5dbc8022eb48290730d25ff94e2b.jpg)
El__burro

Title: Re: 4-1 to 4-2
Post by: Chris400F on February 15, 2017, 03:07:01 PM

Looking good - I am a fan of multiple silencers, not that I have them on my 400/4!
Question - The silencers look quite a long way out from the bike, especially on the second pic.
Could you get them any closer in, and/or have you tried leaning the bike to see how much ground clearance you have?

Title: Re: 4-1 to 4-2
Post by: El__burro on February 15, 2017, 03:15:15 PM

Hi Chris, thanks,
yes, they could be sticking more to the frame but I prefer them like that.
I have not taken a test ride yet.
Probably a few adjustments after that.
El__burro