Author Topic: B31 & small BSA bikes  (Read 3008 times)

Online muskrat

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Re: B31 & small BSA bikes
« Reply #30 on: 10.02. 2018 07:01 »
G'day Tim.
My mate is a former 250 Prodi Champ (Bathurst Mt Panorama early eighties), 5'0", 7 1/2 stone wringing wet, has a B33 racer (ready for Broadford), a B31 scrambler, the DBD34 Goldie and a Catalina. Then there's the Aprillia RS250 (track day next week), 125/250&360 Pursangs, T140, CBX1000 and XJR1300 and rides the balls off all of them.
The little B31 in question is a road rider that had been fiddled with in a previous life. On the last ride of 1000 Km he was just wanting a little more out of corners on the long hills. The valve guides have already been shortened to accommodate high lift cams.
Cheers
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Online chaterlea25

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Re: B31 & small BSA bikes
« Reply #31 on: 10.02. 2018 15:31 »
Hi Muskie,
I have fitted 2 x 2446 scrambles cams to a B33, It improves all round get up and go
I have the same cam pair to fit to my all alloy B33/ GS project

John
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Online KiwiGF

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Re: B31 & small BSA bikes
« Reply #32 on: 09.04. 2020 12:52 »
To resurrect this very worthwhile thread  *smile* my b31 got finished, quite a while ago actually, it even got an award at a recent norton rally (possibly it was the only entrant in non norton category tho  *woo* )

Here’s some pics from the norton rally weekend, held just before the “lockdown” in nz so we must have been lucky no one there had the virus. I dared to add my bike to the “norton singles” line up for judging.

My mate on the mk3 commando was annoyed he spent all that cash only to find himself unable to overtake a humble b31 on the tricky back roads of Taranaki  *whistle*

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1956 A10 Golden Flash (1st finished project)

1949 B31 rigid “400cc hot rod” (2nd finished project, + favourite bike)

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Online Greybeard

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Re: B31 & small BSA bikes
« Reply #33 on: 10.04. 2020 20:59 »
That front brake though!  ;)
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Offline RDfella

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Re: B31 & small BSA bikes
« Reply #34 on: 10.04. 2020 21:35 »
Agree with John re using 2446 cams. Would they need the 696 pinion for 350cc? I have most of the singles cams and used 2442/2446 or 2442/1891 for racing my B31. Tried the 2450/2454 cams and was disappointed. Could never get it to perform. Always found raising compression on most engines with a lowish standard ratio to give the most noticeable 'sparkle' so aim for around 8:1 for road work.
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Online KiwiGF

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Re: B31 & small BSA bikes
« Reply #35 on: 10.04. 2020 22:36 »
That front brake though!  ;)

Yes I know  *pull hair out* but it needs a new, longer, cable to be adjusted properly. It does work REALLY well though despite the lever angle, I welded a spacer on the leading shoe cam bearing face, which made it the best drum SLS drum brake I’ve come across, I guess only until the shoe wears down to match the trailing one again.

I will probably do the “reverse lever” mod when I fit the new cable.

One day I’ll get around to it  *work* (but today is the day the goldwing gets some long awaited TLC to the rear suspension’s electric pre load adjuster .....yawn).
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1956 A10 Golden Flash (1st finished project)

1949 B31 rigid “400cc hot rod” (2nd finished project, + favourite bike)

GL1800 Goldwing, well, the wife likes it

KTM 950 ADV, cos it’s 100% nuts

1952 Armstrong Siddeley Whitley for rainy days (with wife)

Offline stev60

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Re: B31 & small BSA bikes
« Reply #36 on: 13.09. 2020 04:12 »
Done up a while ago 47 C10 and 53 C11, C10 was just a trailer of parts, good learning curve
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Online Rex

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Re: B31 & small BSA bikes
« Reply #37 on: 13.09. 2020 08:32 »
I have a BSA-related bike in a 1936 Ariel Red Hunter. Back in the days of the weekly Blue 'un and Green 'Un people used to regularly debate the advantages of singles vs twins and I could never understand why anyone would sing the praises of a plodding old single over a multi of some sort, but riding this bike through the country lanes and hills and dales I can see exactly why they loved singles.
I also have a Panther 600 for when some real torque-y plodding is required.. *smile*
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Online berger

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Re: B31 & small BSA bikes
« Reply #38 on: 13.09. 2020 11:46 »
hi rex -TORQUE'Y plodding reminds me of when I was I teenager. a builder fella called ted used to come to my dad for lathe work he needed doing on his bikes. he had a panther with what I would describe as a scaffold frame with boards on it and more often than not it would be loaded with bricks and other building material. I often wondered how it stopped.
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Online Greybeard

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Re: B31 & small BSA bikes
« Reply #39 on: 13.09. 2020 14:25 »
hi rex -TORQUE'Y plodding reminds me of when I was I teenager. a builder fella called ted used to come to my dad for lathe work he needed doing on his bikes. he had a panther with what I would describe as a scaffold frame with boards on it and more often than not it would be loaded with bricks and other building material. I often wondered how it stopped.
Did he have very thick-soled boots?
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Offline Rocket Racer

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Re: B31 & small BSA bikes
« Reply #40 on: 28.09. 2020 01:53 »
I've got a c12 sitting waiting patiently that could really do with a new home as I have such a queue of bikes ahead of it. Maybe once I retire I'll do it along with a completely basket case c11  *spider*
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A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
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