Author Topic: B44SS cutting out & difficult to restart  (Read 193 times)

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chrisday59

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B44SS cutting out & difficult to restart
« on: 30 April, 2022, 22:15:23 »
 I've just bought my first BSA, a 1969 B44 Shooting Star. The previous owner gave me the run down on how to start it, although I haven't quite got the knack yet so it takes a bit of effort. Standard instructions - Ignition On, Petrol On, tickle carb WELL, move kick starter until it won't move any further, pull in valve lifter lever, advance the kick starter a little more, release the valve lifter &  let the kick starter return to the top, then kick firmly down. Takes me a few goes (sometimes lots), but it gets there.

But after riding a few minutes, when slowing down for junctions, the engine dies. Not 'stalls' as in as it comes to a stop and I haven't pulled in the clutch, but while still rolling up to the junction. I can't catch it on the throttle. Once it's stopped, I can't restart it. Well obviously I can eventually, but it takes ages. I've tried the obvious, kicking it over with the valve lifter pulled in several times to clear any potential flooding, tickling again in case it's too lean.

As I said, I've just got the bike so I don't have any benchmark of previous performance. And I haven't stripped down either the ignition or the carb yet, as I'd like to eliminate user error before mucking about with something that apparently worked before I bought it. I.E. the only thing that changed was the nut connecting the handlebars to the rest of the bike. (me).

Anything obvious that I'm missing?

Chris


DAVE BRADY

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Re: B44SS cutting out & difficult to restart
« Reply #1 on: 01 May, 2022, 07:44:33 »
Hi Chris,

It sounds like there is probably an issue with fuel at very small throttle openings.  This points to the pilot jet possibly needing some attention if the bike has not been run for a while and has had fuel sitting in the carb.  There could be a bit of a blockage.  Does the bike tick over?  If not try setting the pilot screw out about 1 1/2 turns from fully in and screw in the throttle stop to lift the slide a bit until it does.  The manual has a good guide for this.
You could give the carb a bit of a clean without removing it by taking the float bowl off and removing the pilot screw.  Some carb cleaner may clear any blockage but if this does not work then removal for a deep clean may be best. Timing checked against the owners manual will eliminate that as a problem.

Dave.

chrisday59

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Re: B44SS cutting out & difficult to restart
« Reply #2 on: 01 May, 2022, 12:31:45 »
Thanks Dave, I got a bit of time to play this morning so played with the pilot & throttle stop as suggested. Seems to have done the trick, but I'll wait until the rain clears before taking her out for a play. Once she was running better I used a few blasts of carb cleaner. I'll take the timing cover off and look at the points next, so at least I'm familiar Hopefully just the cable isn't seated properly.

B44RVictor

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Re: B44SS cutting out & difficult to restart
« Reply #3 on: 01 May, 2022, 20:53:43 »
Chris,

When starting mine, I always do what you're doing there but also open the throttle very slightly to set forward the timing.  Don't open it too much as that will cause a kick-back, just enough to take up the slack (1mm-2mm) and it should kick-up first time.  It doesn't have to be a hard kick either, just nice and even right the way through.

If it's stalling on tick-over, get someone who's experienced to set the carburettor up properly.  The tick-over on a B44 should be very slow but nice and even.  I've seen lots on video that are turning over too quickly and are "hunting".   I tried every way but loose to get my tick-over right but found it too difficult for a layman like myself and took it to a specialist.  I was, and still am, amazed at the result - she's ticked over beautifully ever since.