My EP90 having arrived, I have just poured some into the gearbox of my 1965 B40F, having drained off the old stuff last week. The capacity I believe is supposed to be 3/4 pint. Yet the oil was coming out of the level tube when I had put in less than half a pint. Seems a bit odd. The only two explanations which spring to mind are: 1) there was residual oil in the gearbox? But surely the drain plug is at the lowest point when the bike is on its centre stand?; or 2) the oil level tube is too short? Maybe I need to take it out again and measure it? Any advice would be appreciated. Phil.
Or, another idea - long shot - maybe when I'm pouring it in it's pouring straight onto the top of the level tube? Unlikely, I guess. Phil.
Any thoughts on this, anyone? Phil.
The Rupert Ratio book on singles says the 1964 B40 takes 285cc of gearbox oil . Which is about 1/2 pint . Im sure I read some where that some of the later ones took 170 cc of gear box oil . I think you are trying to put to much in .
I can confirm that. I have a digital copy of the 1965 owners "instruction manual" for C15 & B40 models. For gear box oil it says "approx 1/2 pint all models "
manual can be found online here:
https://www.bsaunitsingles.com/owners_repair_manuals.htm
(this may be the American version of the manual but I've so far found nothing different. Looks like National Motorcycle museum website can provide uk manual for £6 ish)
The instruction manual I have says 3/4 pint (425cc.) I must have the wrong manual!
Anyway I've printed off the link sent by hoogerbooger. Thanks very much.