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Title: Concentric carb on B33
Post by: STEPHEN TAYLOR on 15 Jun, 2020, 19:18

I'm seriously thinking about buying a new carb for my 55 B33, is any one using a Concentric and can tell me what bore, cutaway, jets etc. I've looked at several forums but the advice is a bit mixed. Or maybe I'll just spend a bit more and put a new Monobloc on!
Thanks

Title: Re: Concentric carb on B33
Post by: morven21 on 16 Jun, 2020, 17:21

Am running a Concentric on an M21, goes well. If u like, i'll go look, spec; it will be a starting point.

Title: Re: Concentric carb on B33
Post by: STEPHEN TAYLOR on 16 Jun, 2020, 19:19

Thanks,

Title: Re: Concentric carb on B33
Post by: B44R Victor on 19 Jun, 2020, 16:45

Hi Stephen,

I've just replaced my carb on my B44R with a new one and had a good service from Amal Carburetters in Salisbury, Wiltshire. I managed to get the original carburetter replacement and had several conversations with Amal regarding setting up etc. You can contact them at www.amalcarb.co.uk.

Title: Re: Concentric carb on B33
Post by: Christouring on 26 Jun, 2020, 21:58

I've been running a mk1 concentric on my '53 B33 without air filter. All ok with the recommended settings. 230 main jet. Is affected massively by air filter of any sort and I haven't managed to make it work by varying settings as recommended by Amal. So yes fine without air filter - unsuccessful with air filter.

Title: Re: Concentric carb on B33
Post by: STEPHEN TAYLOR on 28 Jun, 2020, 10:03

Thanks very much for your replies. I decided to buy a new Monobloc, bike runs much better, no backfiring, starts easy cold, warm or after a 30 mile run - and it ticks over. I've bought 2nd hand carbs before but there's always been wear on the slide / body etc.

BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: STEPHEN TAYLOR on 15 Jun, 2020, 19:18