Nice A10, the alt is really rare, only on the last of them. It looks the same as the very early Triumph alt, 1953 - the stator is mounted in the outer primary case, not to the inner case. But pull it apart and I'm sure to be wrong. Missing the nice BSA only fuel deflector under the carb, keeps the raw fuel off the mag after you tickle. I prefer the QD rear wheel, but hey, it's a '62, the last A10.
Keen eye and thanks for the info on the alternator models! I actually have the fuel deflector but had to take it off while I wait for some replacement HT pickups - the current ones were pointed right at the deflector when exiting the magneto and causing the HT leads to bend at a steep angle which I didn't like.
I believe that the alternator was "police spec" to cope with the extra electrical demand of additions such as a radio. Earlier police bikes were sometimes fitted with a car dynamo slung in front of the frame downtubes. Also, as far as I know, BSA never sold a twin carburettor A10. Even the Rocket Gold Star had just the one. Only the very early A7 Star Twin 500, before the engine redesign that introduced the A10 in 1950, had twin carbs.
Wow! So glad you mentioned this because it makes a lot of sense - this was said to have been in service for the police department in Indonesia! (I forgot to mention that). You're right about the twin carb too my mistake, although I did have a Super Rocket a few years back that someone had made a dual carb adapter for.😁
@@wheelhousegarage Must say that I'm not really a fan of twin carbs on British bikes. In my experience it's a lot of hassle keeping them in tune and you can't really feel the extra performance anyway.😊
@@wheelhousegarage I do have a soft spot for the A10. My first motorcycling experience, at the age of 8 or 9, was a ride round the block on the pillion of a plunger A10 double-adult sidecar outfit. That was at the time when the Morris Mini Minor and Austin Se7en had just been released, and were replacing the sidecar outfit as cheap family transport here in the UK.
As far as I can tell the primary drive cover looks like it has been substantially modified by the screw on cover over the alternator. Originally it would have been the same cover as fitted to the 1958-59 B31 and 33 models which was a solid cover. It would be interesting to remove the inspection plate and see what modification has been made inside. Also the drive end of the crankshaft would have been built with a longer pin to carry the alternator rotor and the shock absorber cam and spring assembly would have been deleted. I bet someone has fitted a Japanese alternator set-up in there so it's just as well you still have the dynamo. A lovely bike but did the Indonesian police really order it in Nutley Blue? Back in those days police always seemed to ride black bikes.
