Author Topic: 4 into 4 exhausts  (Read 17889 times)

Offline mickwinf

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4 into 4 exhausts
« on: December 28, 2010, 04:32:20 PM »
hi all, whats the latest on the standard 4/4 exhausts for the k3? I know genuine ones are not available but does anyone make a pattern set? i actually like the look of these,i have a reasonable set on my imported bike,this was the main reason i bought it (from DK motorcycles) to use as spares for my other bike.They would rechrome ok but at what cost,any idea anyone?
Love the 500 and 550 have a 500 called Lazarus under restoration

Offline Bryanj

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Re: 4 into 4 exhausts
« Reply #1 on: December 30, 2010, 08:40:55 AM »
Nobody yet but it was only last year that 350/4 ones became available so maybe in the future

Offline andy_c101

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Re: 4 into 4 exhausts
« Reply #2 on: December 30, 2010, 09:59:53 AM »
Hi,
I had the same issue.
I really wanted to retain the 4-4 exhaust look of the K3.
My down pipes were ok-ish, but the baffles were COMPLETELY shot.
So.... I decided to saw-off the (welded) original baffles, leaving me with just the four downpipes (in reasonable condition, but not 'show' condition).

I then bought a set of four universal aftermarket, 'Dunstall look-a-likes', from Bitz-for-bikes : Chrome Universal Silencer [HL554998]
http://www.bitzforbikes.co.uk/Chrome_Universal_Silencer_-ref-2978-116.html

I used exhaust clamps and exhaust gum-gum sealant to seal the joint between pipe and silencer.
The silencer mounting bracket was a bit fiddly, but did successfullymanage to bolt to the oroiganl hangers off the rear foot pegs.
The silencers don't have the flat-sided inner face (for the lower two pipes to clear the rear axle), so they have to flare out an extra half inch or so to clear axle nuts.
- It is a job that takes some patience to get the fit right, and to seal the pipe connection, but is worth it. & I'm pleased with the overall result.

I have thought about getting new s/steel custom made down-pipes, - but I'm still saving up for those, & it may take a while!

Offline mickwinf

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Re: 4 into 4 exhausts
« Reply #3 on: December 30, 2010, 03:05:30 PM »
thanks Bryan, and Andy your bike looks great, a twin of mine when its finished! interesting solution,my exhausts are very solid, main problem is marks on the top at rear end, i think due to panniers rubbing, so will probably get them rechromed at some point when i am feeling rich!
Love the 500 and 550 have a 500 called Lazarus under restoration

Offline Bryanj

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Re: 4 into 4 exhausts
« Reply #4 on: December 30, 2010, 03:58:14 PM »
I think you will hae a job getting them done due to all the "Cack" (technical term) inside that will wreck thr platers bath

Offline mickwinf

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Re: 4 into 4 exhausts
« Reply #5 on: January 05, 2011, 03:47:29 PM »
hi all, latest on the exhaust front i have just found two lower k3 exhausts, genuine new old stock.possibly last ones in country,found through a recomendation on this forum!
Love the 500 and 550 have a 500 called Lazarus under restoration

Offline z1100r

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Re: 4 into 4 exhausts
« Reply #6 on: February 15, 2011, 03:59:07 PM »

 When I used my bike alot I tried loads of pipes....I had dunstall 4-1, motad, 4-1, the std 500 4-4 pipes, and the std K3 4-4 pipes. I had quite a few different 4-1 pipes I just cant remember which ones.

 The point is I found the stock K3 pipes to be the best performance wise by quite a large margin...they are heavy though and have been unobtainable for a very long time. I tried to get some 10 years or more ago.

 I got mine when  I bought a newish K3 cheap off a mercenery that never came back. I actually bought it off his mum who had it in the garden under a tapaulin. The top of the petrol tank had rotted out but the rest was mint. The bike had only done 3,000 miles. The pipes stayed on my 500 until they completely rotted away. I've never had any that worked aswell since. I hope they do make them again.

 Thats a superb effort with the Universals...very impressed.

Offline anparkinson

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Re: 4 into 4 exhausts
« Reply #7 on: May 13, 2011, 06:01:56 PM »
Have a look here. They say for the 500 but look like they are perfect for the K3.

http://www.motostoricheitaliane.com/omol_70_80_90.html
1978 CB550K3 rescued from damp garage where it sat for 10 years.

Offline Oldbuthopeful

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Re: 4 into 4 exhausts
« Reply #8 on: May 14, 2011, 01:06:10 AM »
When I was at the Stafford Show last month I asked 'Mr. Motad' if he was planning to make replacement 4-into-4's for the 550.  He more or less said there was no chance until Dave Silvers' stock had dried up.
Just minutes before deciding to call it a day and go home, I spotted a set of dent-free but acid-stained 4-into-4's on the grass that were marked CB550.  Thinking this was my lucky day, I bought them and lugged them to the car park one at a time (They're heavy beasts !)  When I got them home, I'm not so sure they'll fit 'cause my cylinder head's still with S.E.P. at Kegworth but I thought it was worth a punt at 50 quid.  They look sort of megaphonish, with flat ends, not coned.  Marked something like HM460  -  the guy said they were genuine but I'm a sucker for the impulse buy !  I can always paint them black (if they fit) !

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Re: 4 into 4 exhausts
« Reply #9 on: May 14, 2011, 01:32:42 AM »
I am also in this situation, i have the original 4 into 4 exhausts, outside they look fine, inside its dust

might be having  word with andy on this one  ;)

Offline SteveD CB500K0

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Re: 4 into 4 exhausts
« Reply #10 on: May 14, 2011, 12:24:49 PM »
The model code 460 is from the CB650.

Did they have 4-4 exhausts?
2022 Tiger Sport 660
1971 CB500K0

Offline Oldbuthopeful

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Re: 4 into 4 exhausts
« Reply #11 on: May 14, 2011, 05:43:48 PM »
 
I've just checked the tired looking 4-into-4's I picked up at Stafford and the code is HM461, not 460 as I said earlier.

Sorry for the confusion.  Is that still a 650 code ?  If so I have a set of pipes that won't fit my 550. Anybody got a hacksaw ?

Offline SteveD CB500K0

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Re: 4 into 4 exhausts
« Reply #12 on: May 14, 2011, 05:54:29 PM »
2022 Tiger Sport 660
1971 CB500K0

Offline matthewmosse

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Re: 4 into 4 exhausts
« Reply #13 on: May 14, 2011, 11:11:43 PM »
I think a 650 set of pipes will fit - with perswasion and new hangers for the footrest end of things. I have a set of k3 pipes that are rotten but am hoping to cut them open and copy them including the baffling arrangements - that way being newly fabricated with fresh metal, I should hopefully be able to get them chromed easily. I'd not be aiming for exact replicas so of little use to restorers but I'm not aiming to sell any appart from if I sold the k3 I'm planning on fitting them to. I just want to see how many mpg I can drag out of a 550 and the 4 into 4's seem a really good point to try for although there are also a laser, motad and motad neta plus 2 unknown make 4 into 2 sets to try that I have access to as well as an SU carb.
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

Offline StPeter

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Re: 4 into 4 exhausts
« Reply #14 on: July 23, 2012, 09:59:27 PM »
Dave Silver's now out of their stock of 500F exhausts. Perhaps I should have shelled out a couple of months ago?
Do these go in and out of stock or is that it? CMSNL are advertising a set from the original manufacturer at just north of €1200.
I'm not looking for concours but I do want 4 into 4, what are the options? Has anyone fitted the Italian set ?
Any aftermarket copies out there? I don't feel inclined to lay out a fortune for originals to find that thesteel inside had rotted away and I'm just left with the plating!
1975 CB500
Tiger 1050

 

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