Hello to all again,
I'm well into my plan to update my 1964 BSA A65 Rocket and so far I've fitted a new 12V alternator, regulator rectifier and electronic ignition.
I've turned my attention to the monobloc carb and on stripping it down, found it was black inside, wear on the slide and choke and despite being in the ultrasonic cleaner and changing all the jets etc I've come to the conclusion it's had its day.
I'm thinking of changing it to a concentric as it looks like there is a long waiting list at Amal.
I have a concentric from my Triumph days but I'm not sure what size would be compatible.
Any advice from anyone who has an A65 on a single concentric would be gratefully received. The monobloc is a 389/201.
Thanks
Clarke
Have you tried Surrey Cycles?
Hi,
From the manual the later Thunderbolt has a 28mm Concentric, main jet 230, pilot jet 20, needle jet .106", needle position 1, throttle valve 3 1/2. This is with air filter fitted.
Dave.
Thanks.
I've sent an email to Surrey cycles, I did try Cheshire classic bikes but he said minimum 6 week wait.
I've also emailed Amal for advice. I think it's because I was used to the concentric that I prefer it.
I'll see what Amal says and if I can't get a monobloc I'll try Dave's advice.
Thanks again both.
Clarke
If you are not concerned ith originality you could fit a Mikuni. Allen's Performance do a kit for the A65
https://www.allensperformance.co.uk/carb-kit/carb-kit-listings/
Hitchcock for Amal carbs and parts and help.
Been good with me.