Monobloc on a 16H

Nobody has offered anything so:

The 16H had a type 76 (or 276) 1 inch with 160 or 170 main jet and 6/4 slide.

The early Dommie 7 was the same but 6/3.5 slide.

When the Dommie went to 1" monobloc it had 240 main jet and 3.5 slide. So logically you should need 240 main and 4 slide. But if you buy a 3.5 slide and it is too rich you could file it to make a 4....

But is there a clip on monobloc to fit?

The correct carb is available from Burlen.

Sounds good to me.

There used to be a bolt-on conversion plate for this issue. If no joy finding one, you may have to fabricate a plate and braze it to your inlet stub piece

Paul

It would be useful to have a list if such conversions on this web site, wouldn't it? It took me a while to get my concentric to work instead of monobloc on my Dommie.

Attachment shows carb settings for later 50s Nortons using Monoblocs. This includes the ES2 and Model 7. The jetting numbers are not too far away from what David suggested.

The standard slide for OHV singles was 4, but I've found a 3.5 works better on my 1952 ES2. It spat back on opening the throttle with the 4 (oddly enough, behaviour I also have with my Guzzi V50....)

<edit> although looking at that chart it says a 3 so I'm a bit confused now</edit>

I've just had a look at the Amal listing and it says 4 cutaway for the 1955-16 ES2 (as does Roy Bacon although I am always a little unsure of his data).

I think the chart shown earlier is from the Temple Press manual although I'm not sure who wrote that. Quite a good manual though.

Previously ian_soady wrote:

The standard slide for OHV singles was 4, but I've found a 3.5 works better on my 1952 ES2. It spat back on opening the throttle with the 4 (oddly enough, behaviour I also have with my Guzzi V50....)

<edit> although looking at that chart it says a 3 so I'm a bit confused now</edit>

Ian

was that with new parts or S/H? I understood that the ES2 will spit back if the slide is worn ( as mine does when hot!)

dan

Second hand but fairly unworn. Very little slop in the body for either slide.

I agree that with a very slack slide the air passing beside it will weaken the mixture.