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Messages - BeenyBoy

Pages: 1 [2]
Singles / Re: B31 Magneto oil seal
« on: 23 October, 2017, 09:57:33 »
Thanks Andy...I'll shim it up to give just a hint of back-lash as per the manual

Singles / Re: B31 Magneto oil seal
« on: 22 October, 2017, 09:55:01 »
Just to close this one off:
The general consensus is that the oil seal should be fitted with the spring towards the inside
The problem with the mag rocking on its base was a simple one- there were only 2  locating studs; one of which was had be badly home made and was slightly too long- stopping that side of the mag from seating correctly. Made 3 new studs of the correct length..problem solved. "Jobsa guden" 

Singles / Re: B31 Magneto oil seal
« on: 20 October, 2017, 09:52:43 »
Thanks Dean... There are 2 studs diametrically opposite on the base of the mag and 2 threaded holes on the other diagonal. With the studs seated in the recess in the crankcase it still doesn't feel secure- its "wobbly".. Should there be bolts in the threaded holes ?

Singles / Re: B31 Magneto oil seal
« on: 19 October, 2017, 17:26:55 »
OK... I reckon the seal was originally put in the wrong way round so I'm going with my instinct on this one. However I am concerned that the mag doesn't sit very well on the crankcase "plinth" and actually rocks.... This cant be right surely ? It will clamp down with the strap but....

any thought appreciated

Singles / B31 Magneto oil seal
« on: 19 October, 2017, 14:51:32 »
Hi guys

Partway through a B31 rebuild and come to refit the magneto; I've put a new oilseal in the housing - my gut instinct says spring/open side  to the inside- ie towards the pinion or into the timing chest...  but when I've peeled the old seal off the pinion its fitted the other way round- ie spring towards the magneto.

Which is correct ?


Singles / Re: B31 Small end bush
« on: 28 September, 2017, 19:35:00 »
Thanks for that... suprosed there not available "off the shelf" though


Singles / B31 Small end bush
« on: 28 September, 2017, 16:52:32 »
Rebuilding a 1954 B31 and the small end bush is u/s- virtually in two clearly a replacement is required. (Bike hasnt run since 1974 )
Obtained a new one but it is far roo large both internal and external. Now I've just had an interesting chat with a nice man at Hawkshaws who have stocks of "old" "new" stock but he thinks these were supplied "unfinished" by BSA and need to be machined (reamed) prior to fitting....anybody come across this situation ?


Singles / Re: B31 piston rings +40
« on: 18 September, 2017, 11:22:32 »
Just a bit of follow up..  Peters Classic Bike parts in Holland have stocks of all sizes of rings; not cheap but at least available

Singles / B31 piston rings +40
« on: 15 August, 2017, 16:10:59 »
Hi guys

Anybody know where I can get a set of +40 piston rings for a B31 ?

Singles / Re: B31 Cush Drive Nut
« on: 25 July, 2017, 18:56:07 »
Well that proved to be a real **********.... got it off eventually ...lots of heat and a big hammer !... the nut is completely butchered but at least its off.  A lot of the problem was stopping things moving- the rear brake has seized so couldn't use that so ended up cutting a large wedge of wood and wedging this - with a rubber mat, between the rear wheel and the gearbox/frame.

Anyhoo ...thanks for you help guys   :)

Singles / Re: B31 Cush Drive Nut
« on: 23 July, 2017, 17:50:53 »
Thanks guys...I'll have another go in the morning


Singles / B31 Cush Drive Nut
« on: 23 July, 2017, 15:47:28 »
I cant get the cush dive nut off (B31 1955  Plunger) ...its been really butchered by a previous owner but I cant get it to move; There doesn't appear to be a tab washer behind it- between the nut and the spring- I've tried stiltsons and a big hammer but cant shift it.......any tips gratefully received !!


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