Motorcycle Discussions > British Bikes
bsa lightning
marty 31:
my 1969 lightning has been professionally rebuilt and now on the road, it starts fine, and runs fine, but when its fully hot, stopped then re started its a pig to get going, it has brand new consentric carbs, the correct jets set to the makers settings, but the plugs always look sooty and damp, one thing that has been pointed out is there is no heat spacers between the carbs and manifold, just a gasket, could this be the problem? or would dropping the needle in the carbs one (last) notch help? thanks in advance for any advice and help.
L.A.B.:
--- Quote from: marty 31 on September 23, 2018, 10:55:15 AM ---one thing that has been pointed out is there is no heat spacers between the carbs and manifold, just a gasket, could this be the problem?
--- End quote ---
Yes, it could be, or at least the lack of heat spacers won't be helping matters so I suggest you fit them because they should be there (70-7821 according to the parts list).
https://www.draganfly.co.uk/index.php/bsa/bsa/a50-a-a65/1969/category/313-69-cylinder-barrel-valves
--- Quote from: marty 31 on September 23, 2018, 10:55:15 AM ---or would dropping the needle in the carbs one (last) notch help?
--- End quote ---
The Lightning needles should be at the No.1 weakest position (clip in the top groove) according to the '69 - '70 factory manual.
marty 31:
my needle settings are set second last setting(2nd weakest) so I will try dropping them, also look at my parts list and try and get spacers, as the carbs seem very hot, after fully warmed up, thanks for the advice
L.A.B.:
--- Quote from: marty 31 on September 23, 2018, 05:46:18 PM ---also look at my parts list and try and get spacers,
--- End quote ---
There should also be an O-ring (622/101) on the carb side of each spacer.
https://www.draganfly.co.uk/index.php/bsa/bsa/a50-a-a65/concentric-carburetter
marty 31:
after looking at the parts list, the heat spacer looks more like a thick gasket, would that be right? or as I was expecting would it be a proper spacer? ie maybe 10-15mm thick or so?
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