Way back in the mists of time, when I had dark hair and less wrinkles, I bought a kit of parts to make a 1958 Huntmaster.
With that kit came a brand new concentric.
FB dwellers will know that the bits are painted and are coming back together at last, having been pushed to the back of the bike restoration queue for too long, so the end is in sight.
My question is, given that my FH would have had a monobloc and that I can easily look up the jetting for the monobloc, how should I jet the concentric?
Concentrics and Monoblocs
- simon.holyfield
- Holder of a Platinum Anorak
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Concentrics and Monoblocs
Last edited by simon.holyfield on Wed Oct 18, 2023 10:08 am, edited 1 time in total.
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
- Steven.Carter
- Holder of a Platinum Anorak
- Posts: 4311
- Joined: Mon Feb 28, 2011 4:45 am
- Location: Eastleigh, Hampshire
- Contact:
Re: Concentrics and Monoblocs
Ahh,, mines got a 200 main jet,,, middle clip position. Best thing about a concentric is the tickler is easy to get at.
She looks very shiny
She looks very shiny
- simon.holyfield
- Holder of a Platinum Anorak
- Posts: 4701
- Joined: Mon Oct 17, 2011 11:16 pm
- Location: Norfolk
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Re: Concentrics and Monoblocs
Thanks Steve. That paint job would have provided a lot of us with new carburettors.Steven.Carter wrote: ↑Wed Oct 18, 2023 9:15 am Ahh,, mines got a 200 main jet,,, middle clip position. Best thing about a concentric is the tickler is easy to get at.
She looks very shiny
What concentric are you using? Do you know what size the slide is?
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
- Steven.Carter
- Holder of a Platinum Anorak
- Posts: 4311
- Joined: Mon Feb 28, 2011 4:45 am
- Location: Eastleigh, Hampshire
- Contact:
Re: Concentrics and Monoblocs
Its a 3.5 slide and its a 920 Amal, I forgot to say that
- Roger Gwynn
- Holder of a Golden Anorak
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- Location: Norwich, UK
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Re: Concentrics and Monoblocs
Surely a 626, 600 series 26mm choke. 926 does not exist! The starting point for this conversion is that Concs run about 10% richer than Monos so 10% smaller jets and one size smaller slide.
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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