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#816271 07/15/20 12:18 pm
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Am changing the engine oil on a 1966 BSA A65S. Can you advise where the half pint of oil that is supposed to be added to the crank case is filed from. There is a small cover to the right of the forward engine mount held with two small bolts, is this where the oil is added? Any assistance much appreciated thank you.

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Not knowing the situation with your engine..... just rebuilt, from another bike, etc...... maybe the sump oil is still in there?
There really isn’t any “Oil Fill” provision for the crankcase. Best I can think of would be down the rockers if the cover is still off. You could squirt it into the timing plug also.

Last edited by KC in S.B.; 07/15/20 3:50 pm.

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It is pointless adding oil to the crankcase, the clue is in the fact there is nowhere to put it in.
The only bike of mine with a separate oil tank that needs oil adding to the crankcase is my OK Supreme with total loss oiling


BSA B31 500 "Stargazer"
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Greeves 350
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Suzuki GSX1100 EFE "Sorcerers Apprentice"
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I have seen it advised in at least one service manual to add some oil to the crankcase when changing oil. This assumes, of course, that you have drained the sump as well as the oil reservoir, which is also recommended. I have added oil to the crankcase, and NOT added oil to the crankcase, with no apparent adverse effects. However, if you DO want to add oil to the crankcase, you CAN add it through the small inspection hole on the front of the crankcase that is used to locate the timing slot in the flywheel.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
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Sincere thanks KC, will try the timing orifice.

Best Mel

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Many thanks Mark

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Why do you want to put oil in the crankcase?
What possible purpose could it serve?
The oil will be sucked out and pumped up to the tank in seconds


BSA B31 500 "Stargazer"
Greeves 200 "Blue Meanie"
Greeves 350
Greeves 360
Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500 sprint/LSR bike "Deofol"
Jawa 500 "Llareggub"
Aprilia RSV Mille "Lo Stregone"
'35 & '36 OK Supreme
Kawasaki ZZR1400 "Kuro no senshi"
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It may be meant to promptly start feeding oil to the rockers.


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Prevents return side pump cavitation. This would only be a concern IMHO if the motor was completely dry, like after rebuild. Getting the pump gears willing to suck requires those gears be “sealed” with an oil coating. Otherwise, any pump will simply operate in air space bubble instead of pulling (or pushing) a liquid.
>>>>>>> as the song goes... “you’ve got to prime the pump..... “
And,....... If a guy’s just trying to be careful, it’s simple, can’t hurt anything to do it.

Last edited by KC in S.B.; 07/16/20 3:50 pm.

Down to 1 BSA, 2 Triumphs, 1 '56 Chevy
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sump oil provides a few seconds of flywheel flung Splash oiling
until the pressure feed and scavenge return side stabilize .

cold start damage is additive ... no one is forcing you to follow the maintenance procedures .

Last edited by quinten; 07/16/20 5:43 pm.

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