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Old 10-07-2010, 02:44 PM   #1
cyclocrossbikes
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Default BSA won't start after sitting a long time

My bike (1964 BSA) ran fine when I parked it several months ago... Now it wont start. Replaced the plugs, sprayed some carb cleaner in it, then a little starting fluid... it fires up for a second or two but then quickly dies... What do I do next? Keeping spraying the starter fluid & keep kicking it over until it stays running? or is there something else I need to do? Thanks to anyone with some constructive help, and to any potential witty wise cracks just make sure it's really, really funny before you jump on. Don't really want to waste MY time reading crap you write to waste YOUR time.
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Old 10-07-2010, 02:57 PM   #2
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Default Re: BSA won't start after sitting a long time

Please please please dont use starting fluid. That highly-explosive ether is designed for cold-starting big diesel engines with many times the compression ratio of a simple Brit bike.

I cant remember if you have Amals still ?? If so try keep tickling til it warms/levels off.

Other (Amal) possibility is the low/speed ("idle") circuit is clogged or gummed. Need to pull that horizontal screw/needle and flush with spray nozzle of solvent til you get it out the hole in the (breather flange) body face and the tiny hole in the venturi...


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Old 10-07-2010, 03:09 PM   #3
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Default Re: BSA won't start after sitting a long time

+1 on dragons reply. If it has been sitting with gas in it, I'd bet on the idle passageway being clogged. It's only a 16 thou hole buried in the carb.
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Old 10-07-2010, 03:13 PM   #4
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Default Re: BSA won't start after sitting a long time

Thanks Dragon, I still have Amals and will stop with the starter fluid, I will try the solvent ( like carb cleaner? ) and see if that helps.... thanks for the quick reply too!
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Old 10-07-2010, 04:43 PM   #5
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Default Re: BSA won't start after sitting a long time

If it's been stashed outside damp possibly has accessed the fuel. this is in keeping with the clogged thing mentioned, but possible water build up from whatever (condensed in tank and settled or some shit) maybe that sort of thing
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Old 10-07-2010, 04:45 PM   #6
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Default Re: BSA won't start after sitting a long time

You'd be suprised how some water can get in there even under a tarp or garage
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Old 10-07-2010, 05:33 PM   #7
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Default Re: BSA won't start after sitting a long time

it's been in a garage, in denver.... pretty dry here, but worth keeping in mind.
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Old 10-07-2010, 05:51 PM   #8
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Default Re: BSA won't start after sitting a long time

In my experience (leaving a Bonneville chopper outside during 14-hour trucking workdays in the rainy South), rainwater running down throttle cables ends up in the bottom of the float bowl (heavier than gas), so the jet would never pick up gas / never fire.

Became a quick & easy routine - petcocks off, pull drain screw/plugs from bowls, see gas hit top of case with roly-poly globules of water, turn on petcocks for a second to flush bowls, reinstall drainplugs, ride away like normal.


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