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#484159 04/02/13 4:44 pm
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run990 Offline OP
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my 65 a65 thunderbolt has the later type oil tank fitted with the chrome cap combined with dipstick.now if i fill the oil tank so the level is at max when hot the oil tank breather blows some oil when the engine is run hard ,when the level gets to the lower mark the breathing stops & my minor oil leaks dry up.
are the oil caps the same between a65s & the unit singles,my bike has the open rear type frame its a bit of a bitsa & wonder if it has the single oil tank fitted .even at minimum it holds around 2.5 litres of oil .
its not a severe trail of oil but its strange that it stops at minimum oil level.
any ideas anyone

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The A65 and B44 oil caps of that type have different part numbers.


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run990 Offline OP
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thanks for that info ,now trying to find the various dipstick lengths ,see if mines wrong ,or the tanks wrong.

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6 pts 3.4 lit= 1962 5.5pts/3.1 lit 1963-1965 5.0pts/2.8lit 1966 on. These capacities are are from my Haynes book.

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run990 Offline OP
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looks like my tank is the later type with the wrong dipstick,it stops blowing oil at about 2.5 litres close enough to 2.8 for me .it would also explain why when full i get bad oil emulsification but none when at minimum ,which is infact the correct level.
will save me a bit of cash that extra bit of oil every change.bike has recently completed a complete month of daily use with only one item coming loose so i will treat it to a branded oil rather than supermarket own brand.

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And there are several different lengths of filler necks on oil tanks depending upon weather the bike had side covers or was bare.


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If you've got 2.5lt at the low mark you can't be too far out. Try adding 250cc and see what happens,if thats ok try another 250cc. 2.5 lt in the tank is probably plenty, 3lt definitely is.


1971 BSA A65 Lightning "Bitsa"
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run990 Offline OP
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its due an oil change so i will add a measured amount & see where i end up on the stick ,i will add my own marks if its way out .

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Try to get some Morris straight 40w or 50 wt

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run990 Offline OP
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i used some change before last was not impressed ,seemed to foam up alot untill warm,i used asda semi synthetic last time,engine sounds way quieter from cold,also seems less prone to wet sumping even though its a thinner oil.i still have enough for another change so may give it another go .it could have been the cold weather affecting the straight oil as i used thru winter.


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