Wanted pair 1 1/16" 376 Amals

[Slymo]

Not fussed if they are worn out or even incomplete as I can renovate but a pair of 376's are required. Ideally with one with a truncated float bowl. Happy to disclose the intended recipient but don't want to cause a riot on the most excellent forum.

[trevinoz]

Go on, say Norton. 

[Slymo]

Can’t cause it wouldn’t be true. I’ll give you a hint 1960 original carb no.s 376 242 & 243

[sean]

amal make new ones $$

[trevinoz]

Nice, Slymo.
I envy you if it is your bike.

[Slymo]

more a pile of bits at the moment but the progress is steady. it came with a pair of 1 1/8" Concentrics which seem to be in good fettle but are too big and seem to be jetted rich as well. Good for a late Lightning or similar perhaps

[Slymo]

Sourced a pair quite close to home. Will need to modify one by removing the float bowl but quite looking forward to setting up the four jaw to machine off the body. :)

[trevinoz]

Have you got the special bits to do the job?

[groily]

If the 242/243 combo is for an Oilfield Constellation (?? did anything else used that pairing??), not sure I envy you too much Slymo! Had them on my café-racer semi-Interceptorised & Manx-forked version, and they were OK once set up (it was the rest of the bike, dreadful Albion gearbox especially) but did need tweaking now and then. And I have a similar 1 1/16" pair on my Notrun (274 & 275 from memory) - which are a major pain to play with with due to the parallel fit (and angle of dangle).
The urge to keep things 'correct' overrides my normal preference for simple functionality with the 650SS as it's not a bad beast with a decent Paul Dunstall provenance, but I'm sure it would be easier with a Mercury single carb set-up - and would go near enough as well. Which isn't badly for its era despite (maybe) its primitively long stroke compared to other 650s including A10s. But WTH,  it looks nice and turns the odd head.
Good luck with the 4 jaw and the bottom cross-feed plumbing, and I'd be gentle on the tickling front when it's done - all too easy to drown the plugs, especially the rh one (or so I have found anyway).

[Slymo]

I’ve got the cover with the input tube but need the extended main jet holder and banjo for the supply carb. Both can be obtained from Hitchcocks at a not insubstantial cost. It has occurred to me that a conversion to single carb would likely be an improvement in reliability and tune ability but I am a slave to the keep it original cult. Although I will put on a modern reg/rec as boiling batteries are a chore and it’s easy reversed. Yes it is a Constellation and it gives me great comfort that my other bike is an A10!

[groily]

Sounds as if you have the neat float chamber lid with integral pipe on the rh carb Slymo. (Feked list them new, a bit to my surprise actually).
Both my chopped 376 sets have had the extended jet holders and banjos down below, as in the pic of my Notrun ones when they were off for a bit of a seeing to.
I am told the piped lid is a 'better' option (easier to fit) by one of my mates but not having experienced it, dunno.
On my Connie the carbs were well-splayed (see other pic) so access to slow running and pilot air screws wasn't a big problem - notso on notruns!

Good luck with the build - and hope you like it when you're done. Torquey and quite powerful and an early modular design really with common bits with the 350s, plus superb parts availability. But - I'll bet you a tenner - you'll prefer your A!
(Hint: A lifelong one-eyed one-track Oilfield twin addict/ mate told me to be sure to make a massive head steady like the Forth Road Bridge to prevent the separate cylinders from fretting and leaking oil  . . .  it was worth the effort  . . . but still wasn't perfect.)

[rocker21]

there was a one piece cylinder block available for the big enfields  a mate has one on his rickman , stops the oil leeks

[fffcycles]

Yes, why should we not say Norton? I am sure a few of us have one or two in the shed. Hell I have seven and just gave my best of friends a ‘69 “S” project to finish off.  This is so I can concentrate on my second long stroke A7 and a few Bantams waiting in the wings.
Frank

[Slymo]

Yes the separate barrels and heads do seem to be an Achilles heel also the very light 5/16 and 1/4 studs that hold the whole thing together seem rather flimsy compared with the BSA.  It never occurred to me that one could join the carbs with two banjos and therefore with two ported cover caps as well. There doesn't appear to be be much in the way of either diagrams or close up pictures as to which is the favoured method.

[trevinoz]

The chopped carby doesn't need a float chamber cover.  Both carbys have the extended jet block holders and banjos.
I have never heard of using a cover with an inlet, I have seen them but I thought it was a breather. I learn something new every day.
The worst problem you are going to have is trying to do adjustments between the carbys.
I have a 1966 Atlas with a left & right hand Monobloc, it is really difficult to adjust.
My late friend had a Connie but it was a single carb model.