1961 ES2 concentric setup

I prefer a monobloc for two reasons. Fisdtly it looks right (not important). Secondly, I have always found it to be a more economical carb (important). The monobloc always gives better mpg in my experience. Having said that, a well set up concentric will always be better than a worn out badly set up monobloc. For either carb, make sure your needle jet is a new genuine Amal item. Worn or pattern needle jets wreck carburation.

Hi Grant,

By coincidence I`ve just replaced my old monobloc on a 1955 ES2engine with a Mk1 concentric(26 mm), as I`m about to go on a trip to Eire so this is a trialwith this carb,and I`ve not had time to sort outjetting ,I`lllet you know how the bike performs when I return in a weeks time.Or may-be you might have it sorted by then.These are the settings I`m using, (slide:num-3,/needle-jet-106,/main-jet-240,/no pilot-jet/needle-position3rd-slot.)

Cheers ,Alan H.

Incidentally, the rule of thumb for main jet setting is 12 to 15% smaller on the concentric than the monobloc. So for an ES2, the monoblock main jet should be a 270 and you would expect a concentric main jet to be a 230 or thereabouts. Though I would go with Alan's 240 at least to start with. Have fun in Ireland Alan - a great place to tour on an old bike.

Hi Grant,

My trip to the Emerald Isle went really well,I was on the Munster clubs 46th rally in the company of some truely great folk,riding a plethora of interesting machines.Check out the event on this

website:Occhio Lungo.

Anyhow the carburation seems okish,a little rich on the slide maybe,I`m going to try out a 3,1/2

and I`ll go with Gordon on the main jet 230 or 220 is my next try.

Cheers, Alan H.

Previously wrote:

Hi Alan,

Following your recommendation plus advice from Gordon, I went for a 230/106 setup, and I can confirm the bike is running like a dream and idling smoothly.

Thanks bothfor the excellent information - the power of the community does it again!

Grant

Hi Grant,

Glad to hear you`ve got it sorted.

Cheers,

A.H.