Hi,
My 16H restoration is at the point of me trying to refurb the carb. The internals have seen better days, especially the jet block and throttle slide at least in my opinion but they might be ok. I have attached a couple of photos of them. My main consern is the jet block because the sides where the throttle slide moves are quite worn, the worst is about 0.1" / 2.5 mm. This is probably not acceptable?
I contacted Amal but they said that they don't sell the jet block as a separate part. There was one on ebay but it was a mirror image of the one I need. Do I need to check anything else than the 30T and 51 stamps that it has and it has the holes in the same location. Are there different od jet blocks or anything the bore on mine is 1-1/16".
How can I tell what size my needle jet is? It has only Amal stamped on it and its grey, nothing else identifying it. Is there a way to measure it?
From what I can tell the carb that I have is also not the correct one for the 1937 16H that I have because it has the bore size of 1-1/16" and not the 1".
At the moment the carb has main jet at 140 size, should I change that to something else? And what position should I start the needle with? Also what is a good starting point with the needle jet size?
I found an older post of Richard Payne's of explaining the numbering system of early Amals but I didn't quite fiqure it out yet. My carb has 276/024R stamped on the body and on the float bowl it has 1 A/M and 54-156 on it. Can I just buy parts that should fit the Amals fitted to the 16H, for example 276AE/1BE parts and they would mostly fit mine? Or do I need to figure out what bike this is from and buy parts for it? I contacted Amal about this also but they haven't replyed.
Just wondering, why not buy…
- Log in to post comments
Unless you can get someone…
Unless you can get someone like M Bratby to refurb the carb I think its past recovery.
- Log in to post comments
Like getting your moneys worth?
That has seen some service; what a testament to the engineering. Looks like it went on to be a London courier machine after its time in the army. As above, buy a new one, build the parts into the original body if you are keen to keep the patina... great quality pictures. They are definitely conversation pieces for the shelf.
Cheers
Jon
- Log in to post comments
Which Fitting ?
The 276/024R is indeed 1 1/16" and is listed for the BSA M21 (and a few Continental applications). As such, it will be a flange fitting body. Does your 16H have a fabricated adapter ? Normally it would have a stub fitting.
As has been indicated, Martyn Bratby might well be able to reclaim it, although the mixing chamber too must be very badly worn...But I'd question whether it's worthwhile spending time and money on an instrument that is of the incorrect bore size, incorrect flange and badly worn.
- Log in to post comments
The correct carb is a type…
The correct carb is a type 76, which has air inlet holes around the bottom of the body. Amal (Burlen) no longer make them. I bought a new 276 some years ago because my carb had the wrong jet block. There are three types (Richard is an expert). The reason for this mail is that I later found that Wassel market a correct type 76. I have no idea where it is made or what quality it is.
People have been known to tune the 16H by modifying inlet gas flow paths, increasing compression, fitting bigger inlet valves, larger carb (like yours), smaller diameter exhaust pipes, and claim to make them as quick as an ES2. Your bigger carb might just possibly be the outcome of such a project (but more likely fitted by an optimist). But it looks beyond saving at a reasonable cost (it makes me feel quite unwell to look at it).
Numbers stamped on the flange usually denote the jetting fitted in the factory so that the right carbs were fitted to each machine. They have no significance otherwise. Your number '51' might denote 1951, but that's only a guess. One of my bikes (not 16H) has a year number on the flange.
- Log in to post comments
Just wondering, why not buy a new carb? I know they are not cheap but in my experience worth every penny!
Dan