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#904066 03/01/23 2:29 am
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Been working on A65s for over 50 years, but never a unit single until this winter. Couldn't get started in the fall, so apart she came. Then I've been carefully reading B44 threads......best plugs, best ignition, etc. Just got a new carb from CBS, (a subtle plug for those folks). But in all my reading don't recall the AMAL chokes being discussed. I'll probably try it, but gotta scrounge up a handlebar lever. Thanks for any thoughts!

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We don't have chokes on our 69 B44VS machines. The tickler seems to be enough. We have the original 930 carbs so maybe a new carb would be different.

Gordo


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I have chokes on all my unit singles……but to be honest I tend to tune rich and really don’t use them. Except for one bike??? My absolute best running 1967 B44R would not start if the ambient temperature was below 45 ( +-) Anything higher and it’s a one kick starter….hot or cold. When it refused to start I’d have to bump start it and it’d fire right up…..but kicking would not get the job done.

It didn’t have a choke installed on it when I got it……adding one and using it seems to have cured that problem.

As far as I know……a lot of unit singles didn’t come from the factory with a choke installed.

Last edited by Gordon Gray; 03/01/23 12:52 pm.

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I fitted one to my B44 but it makes no real difference to cold starting, however it does make those troublesome hot starts after turning the bike off for 10 mins a breeze. Put the choke on on a after 10 min hot start and its a single kick starter but that chokes needs to come off immediately it catches as it 8 strokes, leave the choke on too long and you foul a plug.

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Thanks a lot, guys. If I find a lever in my pile I'll make a cable and rig it up. But I'm gonna start her today without it.

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Originally Posted by leon bee
Thanks a lot, guys. If I find a lever in my pile I'll make a cable and rig it up. But I'm gonna start her today without it.
That's probably the best way to know whether or not you'll need them at all.
Like Gordon's bike, my A65 used to start easy when the weather was above mid-40s. Prior to fitting chokes, anything below that I would have to take the air cleaners off and stick a pinky into the slide cutaway while doing some priming kicks, then again immediately after starting. That's essentially all the choke does anyway. That allowed me to play around with how much choke the bike wanted and, once warmed, reinstall the filters and go on my way.

I eventually leaned the bike out a bit to where I need to choke on most cold starts, but my plugs last longer.

If it's hard to start, try the finger in the hole trick. If you find that the bike starts fine today, maybe forgo the choke altogether.

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I have a 69 B44 VS and it didn't come with a choke. I previously had a B50 I purchased when new and it didn't have a choke. For both bikes a choke wasn't needed.


Current Bike: 1968 Triumph Bonneville T120R, 1969 BSA Victor Special, 1975 Norton 850 Commando John Player, M1030M1 U.S.M.C. Diesel
Previous British Bikes: 1968 BSA Lightning, 1969 BSA Lightning, 1969 BSA Firebird Scrambler, 1972 BSA B50 Gold Star, 1974 Triumph Trident
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I've got her running well and starting is not too bad. Another one back on the road, think I'll still try putting the choke together. So far, positive reviews from me for Vape ignition and Wassell carb.

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I use it for hot starts mostly. I use the extended throttle screw for cold starts. Sticks out an inch so can be turned with a gloved hand. In a half of turn, and no touching the throttle. Then back out once it starts witch is 1-3 kicks on mine.

Last edited by Roadwarrior; 03/06/23 11:55 pm.

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I had four unit singles, a B25, (2) B44's, and a B50. I tried fitting up a choke to one of the B44's but found it to be not very helpful. Probably have a choke assembly if I didn't give it away when I parted ways with the bikes. The b-44's were always easy starters, and I developed a system for the B50, making it an easy starter. The B-25 was not so easy...three or for kicks sometimes a few more but it was a daily rider for me for a few years, so it had to start, or I walked.
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My B44 uses a JRC carb with a separate choke circuit and pull-on lever, it works really well but doesn't count if you're comparing AMAL carbs.

However, my A65 uses two 930 Concentric carbs with no chokes at all. I find the bike usually starts after tickling both carbs and then 1 or 2 kicks.

On both bikes, it's essential to have fresh fuel and a well-charged battery before trying to start.

Last edited by gunner; 03/10/23 10:43 pm.

1968 A65 Firebird
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