Has anyone tried the Kehin pair that are fixed together like the racing carbs used on Honda's ect Sudco has a kit that comes prejetted ect. these are 35mm have accl pumps and are expensive $980 US they come with everything but at the price I would like to have a bit more info I am currently running a 34mm Mikuni flat slide runs better than the round slide which worked well also but I like the idea of a accel pump

I had a single VM34 and a cool Mikuni universal accelerator pump. The accelerator pump was great for starting and worked well for accelerartion. They are hard to find these days.

Put Concentrics on it! (ducks and runs).

Vince

Put Concentrics on it! (ducks and runs).

Ok, Ok, Ok, what does ducks and runs mean?

Every time a carb-thread is started there are pages and pages of "concentrics are trash" posts, it's almost as bad as motor oil threads.
Personally I think Concentrics are fine carbs.

Vince

Every time a carb-thread is started there are pages and pages of "concentrics are trash" posts, it's almost as bad as motor oil threads.
Personally I think Concentrics are fine carbs.

I believe you are quite correct. It's keeping them working thats seems to be the problem. Just the fact that I don't have to screw off and on my Mikuni is enough to make me want to keep it. When I go back to a two carb setup, I will probably use the PWK's just for that feature. I have never seen a Amal conversion to a rubber mount. Is there one? I might consider reinstalling mine is i could.

I have been thinking about rubber-mounting mine also, It should be pretty easy and Commando's seem to like having the intake-length increased.

Vince

Marvelous Carbs , cough stutter hiss .When they dont catch fire .Wondering if the Mk II ' resivoir ' jets with the cup to the iet at the needle area fit . Id thgink theyre bound too , was a enrichening confabulation .

The dreaded Prod Racer lists the Steel two piece rubber mount set up . Looking at the Kink in Steves Shiney Pic ., which is standard . I got at least another 500 Hp from useing coustom pipe bend fabricated
intakes ( for 32 Mk IIs ) The curve cut tangental so the shape was a continuous runner , into 32 tapered to 30 ports ( or 30 ports tapered even out to 32 no less at the manifold face ).Think its worth it as more
laminar flow & speed continuity , as Paranoics regard the sudden alteration as tumbling induceing .More like a bit of plumbers elbow , where longer smootly contured progessive ones dont slow it down or choke it .

At max continuous rpms in the old days , they found the ram air in velocity stacks interfered with the float chamber bleed & pressure , so developed the offset ones with bleeds to atmosphere. something to watch if youre off to Bonneville .Bit like some carbs supercharged need a Air Box at boost or the intake pressure depresses the float at speed . This can be expensive . this is Daytona type 70s Mk 1 Concentrics .
Magnesium Bodied ones available then . Very Good , send to ME .





Theres some horrible old heavy thick wall ( 1/8 odd. ) multi laminated STRAIGHT rubber spiral wound Hose . M.o.D. or Diesel
water hose . A mates T100 had the carbs mounted on that about 6 in long , bellmouths/intakes level with seat post .
Flopped around a bit and caught fire more than once , Ex race bike in old 59 Frame, unit .
The tubes textured , you can see the white canvass at cuts .A lot or Bonnies have intake stubs , which , reversed , would be usable perhaps ,Thruxtons had the Rubber Mts. ( Vibe Isolation , Float tremor & Airation Avoidance )

Seen a pic today with a Alloy plate ( maybe 14 g. ) under Carb Tops , so tops secure it as a pair .
The Mk IIs have two threaded holes on a flat face ( Aft ? ) to put a bar accross to secure as a pair .

I have been thinking about rubber-mounting mine also, It should be pretty easy and Commando's seem to like having the intake-length increased.

The flang on the carbs is too short to machine, I would think. An adapter could be made, but it would, as you say lengthed the distance to the head. I don't have the tech skill to understand how it would effect power and response. Then you would have to find a rubber mount that fits.

Diablouph wrote:

I have been thinking about rubber-mounting mine also, It should be pretty easy and Commando's seem to like having the intake-length increased.

The flang on the carbs is too short to machine, I would think. An adapter could be made, but it would, as you say lengthed the distance to the head. I don't have the tech skill to understand how it would effect power and response. Then you would have to find a rubber mount that fits.

Silicon hose,or similar, probably find quite a few adapters to do the job

I think youll fit REIFORCED , something like Bulldozer radiator hose , from a rural engineering supplies is Durable , if ugly .

A lot of unreinforced plasticish ones can go all gooie & split , undetectable on the middle cylinder , and expensive .
Lean , Burn rings , drop hard bits in bearings , whoopsie . Just as well WE dont have a middle Cylinder .But PLASTIC , !@ ?
On a MOTORCYCLE . ! The old 50s tail lights , were Glass , same fit as 60s plastic type . USE REINFORCED please .
Used to use the clear armoured / woven core two lam Fuel Line too . Scared of ruptured line and sparks , etc , specially with
those Concentrics . ( Dont Worry , wondered why a whole bus que was twikly eyed warming up the Bonnie , monoblocks
FIRE , Dribbling intakes and spit back , So one studies ' Flame traps ' . spelt Gauze , the fire dosnt go through. We Hope .)

I have my Amals rubber mounted for ages .
The thinwall SS manifolds are permanently bolted to the head , and the carbs on a common alloy carrier with ss tube inserts , Vee'd out in 2 directions :
vertically to clear the frame backbone when removing the slides , and lengthwise to create more room for airfilters .
the carrier is also internally drilled for a balance pipe .
removing the carbs as a unit is real easy .









For rubber , I use good quality radiator hose with no issues .
Years ago I had one exploded on my N15 because of a kickback .
( damned Boyer ..! )

Cool stuff Ludwig! My two bobs worth, I like Amal carbs, once sorted. I have made up some nice 5m thick tufnol insulators, between the head and manifolds. This stops the heat soak getting back to the carb bodies. I have also found getting really anal about setting the fuel levels, within the tolerances offered by Burlen. Rather than the old tried and true method of simply setting the floats to a pre determined height. Makes them carburate even sweeter at idle and off idle. Also the mixture is better off being set on the rich side at idle to ensure a clean transition from idle onwards.

Cheers Richard

Ludwig. I really like the installation, but it may be beyond the abilities of the average Norton owner. Did you make your own manifolds and mounting plates? How did you get the curved section?