BSA b44/50

kommando · Jul 21, 2021

Like the Norton gear pump the BSA one leaks from feed side to scavenge side via the shafts, I do the same mod as my Norton pump fix and add X rings to the shafts.

Plus you need to check the pump assembly as it can leak at the joints and the face where it sits against the crankcase.

EstuaryBoy · Jul 21, 2021

In my innocent days of youth (!) I commuted for four years on a B44, and whilst I did do top end work in pursuit of what I now believe to be the mythical: '90+mph' performance figures, the bottom end (apart from the gearbox) remained unmolested and totally oil tight and trouble free.....

Mike40M · Jul 21, 2021

Thanks for the answers, seems I have another winter job. Will also check the ball in the return suction pipe, which might prevent leakage between feed and return side of the pump going down to the sump. Luckily have a new spare pump.

kommando · Jul 21, 2021

Mike40M said:
Will also check the ball in the return suction pipe, which might prevent leakage between feed and return side of the pump going down to the sump.

No, all that does is stop the oil that was on its way back to the tank held in the pipe from draining back, a egg cupful at most.

baz · Jul 23, 2021

I think I may have found the problem
I took the outer timing cover off to access the anti wet sump ball and spring and realised I had the wrong blanking bolt that retains the spring against the ball bearing
It didn't quite meet the spring
I went and found a spare inner timing case that had the correct bolt and it was approximately 3mm longer
So I have re seated a new ball bearing and fitted the correct bolt
Put it back together and started it a couple of times to let the oil level settle
I've checked the oil level in the tank and I'll check again in 3 days
If there is no improvement I shall remove the oil pump and check it
Cheers

baz · Jul 30, 2021

Definitely had the wrong length bolt compressing the spring on the ball bearing
I've been starting the bike every day so I haven't been able to give the wet sumping a fair appraisal
But I'm now away from the bike for over a week and I measured the exact height of the oil in the tank before I left
Fingers crossed
Cheers

Mike40M · Jul 30, 2021

Presume the bolt is same as on earlier models. A screw 3/8 x 26 with a screwdriver slot. Intended to go in so it's flush with the case. Punched to lock.
What is the correct length of that bolt? Or rather how long shall it go in? No hurry to get an answer.

baz · Aug 6, 2021

Mike40M said:
Presume the bolt is same as on earlier models. A screw 3/8 x 26 with a screwdriver slot. Intended to go in so it's flush with the case. Punched to lock.
What is the correct length of that bolt? Or rather how long shall it go in? No hurry to get an answer.

Yes it's the same one
I don't have the measurement for you but it should compress the spring by approximately 3mm
Or at least it does on my bike
I've just checked the oil level in the tank after one week and it's stayed exactly the same as when I left it, so it was definitely the spring length that was the issue
I should add that I changed the ball bearing (1/4") for a 6mm one
In the hope it would seat better on a slightly different part of the hole
I gave it a sharp tap with a parallel pin punch and hammer to make sure that it seated properly
Cheers

baz · Sep 28, 2021

Having to do some alterations to this seat base to get the fit that I want

baz · Sep 29, 2021

I've managed to get the BSA bantam/c15 seat base to fit a bit better

baz · Sep 29, 2021

This is a photo of the seat before I modified the base
I'm hoping I can get the cover back together and looking reasonable

baz · Sep 29, 2021

The bike has not been started for 7 weeks and the oil is still at the same level in tank
I'm happy with that

baz · Oct 1, 2021

Managed to get the seat back together
I'm happy with it considering its humble beginnings as a pattern seat made for a BSA bantam !

Mike40M · Oct 1, 2021

Nice job. Seems you can open the oil tank without interfering with the seat. Had problem with that on one of them.

baz · Oct 1, 2021

Mike40M said:
Nice job. Seems you can open the oil tank without interfering with the seat. Had problem with that on one of them.

Yes I can open the oil tank cap (only just) it doesn't have a dipstick
So not be a problem

crusadersports · Oct 1, 2021

Baz, could we trouble you for a broadside view of the whole machine? Id love to see what the B50 looks like in that chassis with that Gold star tank topping it off!

baz · Oct 1, 2021

crusadersports said:
Baz, could we trouble you for a broadside view of the whole machine? Id love to see what the B50 looks like in that chassis with that Gold star tank topping it off!

I'm not back at home until Monday
I'll have a look through my older photos and see what I already have
But the bike is evolving I have adjusted the fit of the tank several times

baz · Oct 1, 2021

Here's a shot

crusadersports · Oct 2, 2021

baz said:
Here's a shot

Thats a fabulous looking bike baz. The B50 looks right at home in there and the sweep of the exhaust pipe is masterfully done. Even the relationship between the reversed gear lever and footrest looks like it should work well. I bet itll sound good through the Gold Star 'silencer', but will it twitter on the over run?

baz · Oct 2, 2021

crusadersports said:
Thats a fabulous looking bike baz. The B50 looks right at home in there and the sweep of the exhaust pipe is masterfully done. Even the relationship between the reversed gear lever and footrest looks like it should work well. I bet itll sound good through the Gold Star 'silencer', but will it twitter on the over run?

I hope it has the Twitter on the overun
I need to find the time to make the wiring harness etc etc to finish it but basically it's mechanically all there
I've bought an 8" TLS front wheel for it

BSA b44/50

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