www.b50.org

SteveS

Hi Ian A previous contributor on this site did what you are considering - see here . There is a fair bit of cutting an re-modelling required to clear the oil filler location. Also the tank is quite a bit longer so sits a bit too far back in my opinion. I'm planning on doing something similar on anot...

SteveS

Hi Basil

I will be interested in the responses you get as I have just sent off an application to the DVLA with the same docs as you describe for my A65.

I successfully completed applications for my B50T in Nov 2018 and more recently my A75 in Jan 2020.

SteveS

Hi eebtr7 That's interesting about bikes getting damaged at sea and returning to the UK. I've not heard that before, although I have read about unsold stock coming back to the UK - see below. The salt water damage may explain why some Y suffix bikes have been so extensively updated with later 69 par...

SteveS

. I've got no further with my main project but atleast the Lightning is back together, just waiting for the BSAOC Vehicle Report so that I can get the bike registered with the DVLA. . A65 Lightning 1967 Right Side View.JPG . P.S. 20/06/2020 Received info back from BSAOC, great service as usual. :th...

SteveS

Link here - BSA B50 MX Crankcases

SteveS

Hi Craig Depends how bad the thread is. You could try a 'thread restoring file', plenty on ebay etc. just need to check the thread you have and count the tpi (teeth per inch) so that you purchase the appropriate file. Another way may be to turn a knackered fork oil seal holder into a die by cutting ...

SteveS

Hi crankbuster

Which kick start lever is in your clip? It looks a bit like the Triumph T160 type

SteveS

Hi Ian

Thanks for providing that link to the thread that Stan contributed to, as I was searching for it the other day and couldn't find it

SteveS

Hi Beat

According to b50.org under 'Frame Codes' CE is March 1971 and apparently

Swiss men voted to give women the vote and allow them to hold office.

SteveS

Are they the ones with the built in cracks?

SteveS

. Hi Neil I can understand your need for the experiment, as genuine B50 rocker box castings are thin on the ground. Thanks for letting us know, it will help others in the future. I am wondering though, if the rocket shafts on the C15 are in exactly the same location as the B50? Yes they are :thumb ...

SteveS

Hi Tom

Thanks for posting the details about E&V's rockers, I wasn't aware he was making them.

I was thinking the same as you about Stan

SteveS

Hi Momu That "bloke" is Stan Millard - HPStan, very well known and respected in the Flat Track community over in the US. Did you see Stan's high port B50 head? May help with your head plans - see here . If you get time it's worth checking out Stan's posts. If you use the advanced search and put his ...

SteveS

Hi Momo Some of the guys have done more than just theorise, but I don't think you will get anything off the shelf. If you check Stan Millard's Photobucket page here there are a few pics of the mods he did to B25 rockers to improve the ratio. I'm fairly certain he used the B25 rockerbox (eccentric ad...

SteveS

Hi Momu

I've found the stand very useful; rebuilt several unit single motors over the years using it.

I guess a stand that rotates

like a spit

could be useful although I can't think of an assembly sequence that would be better in a rotated position?

SteveS

. Hi I found the type that locates on the front and bottom engine mount very adaptable, plus the one below has the benefit of being able to rotate. . Engine Stand.JPG . If you need any dimensions let me know. . I believe some people have used part of a damaged frame to form the main tube and then w...

SteveS

. Hi Phil There appear to be a few references to B25R on the internet linked to products to suit that model. I have to admit I am not aware of the model. However I have checked Rupert Ratio's book, Unit Single Manual, Volume 3, Lesser known Models. On page 62, Chapter 11, Special Order Models, the ...

SteveS

Hi Some of the big tanks had mounts fitted for a tank brace / strap as standard(?) - see discussuion here . This discussion got me checking the nos seat I bought last month, turns out it's a short one. So I can confirm the other observations i.e. seat is cut off at front, 13mm from front edge of mou...

SteveS

I stand corrected, parts list shows the distance piece :shock: I've checked all my oif bikes and some have the spacer and others do not. Looking carefully where there is no spacer the engine mount has been squashed inwards by previous owners (?). The frame mount is only 1/8" thick so if the front en...

SteveS

Correct, no spacer required

THIS IS INCORRECT - please ignore and see comments below

SteveS

Hi Remember the oif 71 B25T/SS crankcases are essentially the same casting as the B50 but with different machining carried out. So it is possible to convert a set of B25 crankcases to B50, although there is a fair amount of work required. The crankcase throat of a oif b25 has enough meat to take a s...

SteveS

The B50 rocker box is unique to the B50. However some of the guts are interchangeable. See here

SteveS

.
The Indians have finally got round to making a copy of the locking Feridax throttle - see here. Not seen any reports on forums about the quality but the price (£14GBP) looks good

SteveS

.
The two oil holes in the cam follower stem align with the thicker end of the foot, so when fitted the oil-ways will face to the rear.

I don't know if there is an engineering convention that dictates this orientation?

SteveS

Hi Malc

Thanks, simplest solutions are the best ones

SteveS

. I think the part number is 97-4004, Washer - damper tube (Dowty) as shown in the parts book, number 32 in B50 72 parts list. You can find them on ebay etc. Also someone like Goodridge would stock them. If you can't find 'Dowty' try 'Stat-O-Seal'. If we knew the exact spec. i.e. id, od and thickne...

SteveS

Yes, I can see this one, worth the wait

SteveS

Hi Beat You never cease to amaze me with your ideas and innovations :thumb As Plato said 'Necessity is the mother of invention'. Regarding the 'the wingwheel', it will be interesting to see how it performs with hard use. You may find you may have to adjust the angle of the vanes so that it acts more...

SteveS

Hi

The B50SS used a 2:1 ratio speedo drive gearbox (BG5330/24), but as stated above the B50T was supplied with a 21/10 ratio speedo drive gearbox (BG5330/104) to compensate for the slightly larger diameter of the Dunlop Trials Universal tyres fitted as standard to the 'T' model.

SteveS

So, it’s likely to be one of three things: Speedo head Cable Speedo drive at rear wheel Speedo head Try putting a bit in a drill and running the speedo with it. Or instead of a tight-fitting drill bit you could use a small thread tap, as the 1/8" square end is an ideal size to drive a speedo/tacho. ...

SteveS

Hi Claus

Worth taking a look at these two threads:

This one may help you identify the correct relationship between speedo head and the speedo drive

This This one may help with regard to aftermarket choices

SteveS

Hi Tom

Looks great

Did it come in on budget?

SteveS

Thanks Chris, taken note of your comment about the lifter pad, although part number didn't change(?) I checked my parts books (which I should have done to start with) and the parts numbers for the internal components match up. The C15 seems to use an additional 1/2" thrust washer somewhere unless th...

SteveS

Hi

B50 rocker boxes are a bit thin on the ground. I've finally got hold of a good B50 rockerbox casting but don't have the innards. My question is how much of the contents of a C15 or other unit single rocker box (barring the B25 with eccentric rocker spindles) would fit the B50 rocker box?

SteveS

Hi Beezergeezer

See the previous thread here. I think there may be other discussions about the same subject.

Years ago my Dad fitted an early A65 oif centre stand to his T25T with no issues. He retained the side arm although he reworked and shortened it slightly

SteveS

Some of you will be familiar with Brad Jones previous work including: OIF B25 /B50 Incomplete Guide BSA Motorcycles - The Final Evolution From the inside - BSA / Triumph's Umberslade Hall Research Establishment Revealed Brad has now published another book entitled: Norton Villiers Triumph - Viable p...

SteveS

That seems like a good deal. Wish I had the parts to trade

SteveS

Hey Beat

Not sure if you were being serious but it made me laugh!

the new piston. in 90 mm bore (it is much shorter because I had no money to buy a long one)

SteveS

Apologies, misread the post

. The RAL color I quoted is for the frame components. For future reference I'll edit my post to make it clear.

SteveS

Hi

RAL7038 is commonly quoted. (THIS IS THE DOVE GREY FOR THE FRAME COMPONENTS - NOT HUBS)

See topic here

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