Search found 129 matches

by BasilF
Mon Jan 18, 2021 4:23 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

Final chapter:- Fitted a smaller diameter master cylinder. IMG_20210116_100717_1.jpg This gives a lighter lever pressure but more lever movement. I've had problems bleeding the system. It seems to work best if I do it on the bench with the banjos uppermost and the master tilted with the outlet high....
by BasilF
Thu Jan 14, 2021 5:43 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

kommando wrote: Wed Jan 13, 2021 10:14 pm Mini drum brakes are 7" so you could use one as a rear brake plate, rears are SLS and 1.25" shoe width, fronts are TLS with 1 .5" show width.
Looking at my notes, the BSA brake uses the shoes, springs and snail cams of the late model Morris Minor, not the Mini.
by BasilF
Thu Jan 14, 2021 2:45 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

The studs are cast into the slave cylinder with a T top holding them in. Not enough thickness on the alloy slave cylinders to rely on just threads.
by BasilF
Thu Jan 14, 2021 11:40 am
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

Kommando; Slave cylinders are 7/8" dia so the ratios are 3.9 for the 5/8 master and 6.16 for the 1/2. My current master is 5/8 but I've ordered a 1/2 to try although the 5/8 seems OK. I expect that the 27 recommended for a disc is because they have no self-servo effect like a twin leading shoe drum....
by BasilF
Wed Jan 13, 2021 12:10 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

Post 3 final. You can now start on the hydraulic lines. Mead and Tomkinson used chunky BMC brass fittings as used on the mini at the time. For my second conversion I helicoiled the banjo thread on the cylinder from 3/8 BSF to 3/8 UNF which allows the use of much prettier and more modern looking moto...
by BasilF
Tue Jan 12, 2021 11:17 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

The red rectangle on the hole layout drawing represents the front and back faces of the cylinder.. These are symmetrical about and tangential to the circle centred on the axle. The cylinder mounting studs are not.
by BasilF
Tue Jan 12, 2021 5:37 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

Post 2 of 3 The conversion is straight forward (the second time round). Get a BSA OIF backplate and dismantle. Keep the shoes, snail cam adjusters and return springs. Put the rest on Ebay at exorbitant prices. Cut off the part where the mechanical cams were down to a level about 1mm above the brake ...
by BasilF
Tue Jan 12, 2021 1:47 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

Post 1. We all know that Mead and Tomkinson did their own hydraulic front brake conversion for racing but I recently read “Thunderbolts and Lightning by Peter Crawford” where he states that it was the intention to introduce a hydraulic front brake for the 1971 season based on BMC Minor and Mini comp...
by BasilF
Mon Jan 11, 2021 1:14 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

Re: B50 hydraulic drum brake

Finally got a day with the roads not frozen and almost dry so I could test the hydraulic brake. At moderate deceleration the lever force seemed about the same as the mechanical brake but as you brake harder it is much more proportional than the mechanical brake. There is also much less lever travel....
by BasilF
Fri Jan 01, 2021 4:36 pm
Forum: This Forum
Topic: Picture orientation
Replies: 5
Views: 525

Re: Picture orientation

Lack of gravity? Is that why the picture is upside down.
Next posting will be about hydraulic front brake which is circular so it won't matter.
by BasilF
Thu Dec 31, 2020 7:48 am
Forum: This Forum
Topic: Picture orientation
Replies: 5
Views: 525

Picture orientation

Does anyone know why, when I post a picture, it isn't always the right way up in the posting. It can be on its side or upside down. When you click on it to view it full screen it then displays the correct way up.
Example:-
Boxrevised1.jpg
by BasilF
Thu Dec 31, 2020 7:42 am
Forum: Project bikes
Topic: 1972 B50 SS Return to Flight .
Replies: 75
Views: 2070

Re: 1972 B50 SS Return to Flight.

Boxrevised1.jpg I managed to fit a regulator and Pazon ignition box in the original electrical box but had to leave out the big capacitor and stick the flasher unit to the base of the box. I was impressed with vapour blasting. It seemed to seal the aluminium surface so the metal looks bright for a ...
by BasilF
Tue Dec 29, 2020 5:57 pm
Forum: Tech
Topic: indicators
Replies: 3
Views: 251

Re: indicators

Check the earth (+ve) from the headlight shell to the frame.
by BasilF
Mon Dec 28, 2020 5:29 pm
Forum: Tech
Topic: Concentric premier pilot jet
Replies: 3
Views: 175

Re: Concentric premier pilot jet

Steve. The pilot hole it supposed to be 16 thou. The cross drillings are way bigger than that and there are 4 of them so it's only the hole in the end that is critical. I'll check which guitar string is closest to 16thou and see how it fits.
by BasilF
Mon Dec 28, 2020 5:15 pm
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 883

B50 hydraulic drum brake

1608825214707.jpg 1609164783598.jpg With lots of help from Beesa71 I've been converting a conical hub backplate to hydraulic. It's now ready to road test but the weather isn't really suitable (I'm not doing hard stops on wet or icy roads at my age). If it proves to be any good I'll do a how to writ...
by BasilF
Mon Dec 28, 2020 1:36 pm
Forum: Tech
Topic: Concentric premier pilot jet
Replies: 3
Views: 175

Re: Concentric premier pilot jet

Forget the above. More magnification and modifying my guitar to 5 strings has revealed that there is a hole at the end. It was just blocked.
by BasilF
Mon Dec 28, 2020 12:55 pm
Forum: Tech
Topic: Concentric premier pilot jet
Replies: 3
Views: 175

Concentric premier pilot jet

Pilot.jpg Photo shows the pilot jet from my new premier concentric carb. It screws in the opposite side to the air bleed screw and takes the place of the blanking screw and fixed pilot in the normal concentric. It has 4 small holes in the side of the shaft but no hole in the tapered end. Is this a ...
by BasilF
Thu Dec 24, 2020 7:17 pm
Forum: Tech
Topic: How do you remove?
Replies: 2
Views: 222

Re: How do you remove?

If it is threaded then, looking at the way it operates, it would have to be a left hand thread.
by BasilF
Sun Dec 13, 2020 8:27 pm
Forum: Project bikes
Topic: B50/44 Hybrid
Replies: 21
Views: 1028

Re: B50/44 Hybrid

Or ball bearings!
by BasilF
Thu Dec 10, 2020 10:26 am
Forum: Tech
Topic: Which Spark Plug?
Replies: 16
Views: 780

Re: Which Spark Plug?

I think the plug centre has to get hot enough to burn carbon off otherwise it will start shorting sooner or later because carbon conducts electricity. But it mustn't get so hot that it melts the centre electrode. Could be all bollocks though!
by BasilF
Tue Dec 01, 2020 5:29 pm
Forum: Parts & Bikes wanted
Topic: B50 Tank & Side panels
Replies: 6
Views: 444

Re: B50 Tank & Side panels

I also think the side panels are steel as you can see the recess pressed in where the front fasteners go.
by BasilF
Sun Nov 29, 2020 7:15 pm
Forum: Tech
Topic: Brake master cylinder.
Replies: 7
Views: 611

Re: Brake master cylinder.

No brace. Can't see one on the Mead and Tomlinson bikes. The hydraulic brake won't be more powerful. Hopefully just a bit lighter and more controllable.
by BasilF
Sat Nov 28, 2020 1:59 pm
Forum: Tech
Topic: Brake master cylinder.
Replies: 7
Views: 611

Re: Brake master cylinder.

No, upgrading to hydraulic drum like Mead and Tomlinson. Photos will follow if it isn't a total disaster.
by BasilF
Sat Nov 28, 2020 8:54 am
Forum: Tech
Topic: Brake master cylinder.
Replies: 7
Views: 611

Brake master cylinder.

Does anyone know if this Triumph master cylinder clamps to the handlebar with the standard 1971 pattern electrical switch? It looks like it might but £150 is a lot to take a punt on.
TRIUMPH T140 BONNEVILLE T160 TRIDENT 1973-78 DISC BRAKE MASTER CYLINDER 60-4102
triumphmaster.jpg
by BasilF
Thu Oct 15, 2020 4:09 pm
Forum: Tech
Topic: 1974 tr5mx Engine Mounting Bolts
Replies: 7
Views: 904

Re: 1974 tr5mx Engine Mounting Bolts

Draganfly and PES in the UK both have them (21-2160) in stock. BSAUNITSINGLES in the US list them as in stock. Easy enough to make one but the plating charge for one bolt could be an issue.
by BasilF
Wed Oct 14, 2020 10:40 pm
Forum: Tech
Topic: 1974 tr5mx Engine Mounting Bolts
Replies: 7
Views: 904

Re: 1974 tr5mx Engine Mounting Bolts

There must be lots of bolt suppliers with UNF bolts in the USA. See chart below to find out what length you need. Plain section should go through both lugs.
ScrewBolt_HexHd_UNFine_THRpart.pdf
(101.37 KiB) Downloaded 37 times
by BasilF
Wed Oct 07, 2020 7:02 am
Forum: Parts & Bikes wanted
Topic: Electrical Box Mounting
Replies: 10
Views: 1232

Re: Electrical Box Mounting

The front mounting bracket for the later rubber grommet mounts is available in stainless steel from Classic Bike Parts https://classicbikepartsuk.uk/product/bsa-b50-electric-box-mounting-brackets-83-3813-83-3814/ If you can't get shouldered bolts the 1/4unf bolts with the Spacer - headlamp mounting ...
by BasilF
Fri Oct 02, 2020 9:59 pm
Forum: Tech
Topic: TR5mx Fork/Steering Stem
Replies: 16
Views: 1699

Re: TR5mx Fork/Steering Stem

Its threaded both ends, a course thread into the bottom yolk and a fine thread into the bearing adjusted nut. Heating the bottom yolk will certainly help if it is tight.
by BasilF
Fri Aug 28, 2020 3:55 pm
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1583

Re: B25SS exhaust pipe

IMG_20200826_174856~2.jpg
Here is a photo. Cut and shut was half way round the front bend.
by BasilF
Fri Aug 28, 2020 3:32 pm
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1583

Re: B25SS exhaust pipe

I had the same problem with the b50 pipe I recently bought. Tightening the front bend would have stopped it fitting through the frame at the back so I cut about 15mm out of the vertical part of the front bend and then welded it back together. To be fair, it is a bastard of a pipe to make compared wi...
by BasilF
Wed Aug 26, 2020 10:21 pm
Forum: Project bikes
Topic: My B50SS
Replies: 53
Views: 15909

Re: My B50SS

Mikuni is an option. Does the Mikuni (VM?) fit to the existing air cleaner and do you have the correct jetting.
by BasilF
Wed Aug 26, 2020 6:45 pm
Forum: Project bikes
Topic: My B50SS
Replies: 53
Views: 15909

Re: My B50SS

Had a few rides now and it is as much fun as I remembered from 1972. I've posted elsewhere about my registration and short circuit problems. New lithium battery is behaving well and terminals are more recessed than original. IMG_20200813_093009.jpg Last ride produced a new problem with a sticking ca...
by BasilF
Wed Aug 26, 2020 6:34 pm
Forum: Tech
Topic: Lozenge Silencer
Replies: 6
Views: 1352

Re: Lozenge Silencer

Had a go at making a new lozenge silencer as a spare for my B50/ IMG_20200716_114704.jpg Made a wooden buck from the measurements of an original silencer. To get a more curved shape, rather than fold a channel and then make the ends into a lozenge I made a top and then sides and welded them all toge...
by BasilF
Fri Aug 21, 2020 11:09 am
Forum: Tech
Topic: Cooked battery
Replies: 11
Views: 1390

Re: Cooked battery

Solved. A heat shrinked part of the positive battery lead was close to the battery carrier and touched it due to vibration when the bike was pulling at low revs. The battery carrier is rubber mounted but obviously touches the frame somewhere because it is connected to earth. Once the heat shrink and...
by BasilF
Wed Aug 19, 2020 1:27 pm
Forum: Tech
Topic: Cooked battery
Replies: 11
Views: 1390

Re: Cooked battery

Trawling through YouTube, 14.5volts seems a very common voltage for motorcycle rectifier/regulators. There also seems to be consensus that about 14volts is the maximum that should be fed to a fully charged lead acid battery if you aren't going to damage it eventually. I can't see a satisfactory solu...
by BasilF
Tue Aug 18, 2020 6:26 pm
Forum: Tech
Topic: Cooked battery
Replies: 11
Views: 1390

Cooked battery

I went for my first long ride today and had to turn back early due to a misfire. Got home and found the battery was boiling. The battery was known to be quite old and not well charged before the ride. I have a podtronics rectifier regulator fitter but no 2MC capacitor. I've fitted a voltmeter and th...
by BasilF
Thu Aug 13, 2020 6:48 pm
Forum: Tales Of Woe
Topic: Registering an historic BSA
Replies: 9
Views: 2117

Re: Registering an historic BSA

IMG_20200813_085323.jpg End of the saga. Got a probably illegal number plate (Slocombes of Neasden was the dealer who sold me my first B50 in 1972). Took the bike out for its first road ride and it ran well. Only an intermittent speedo (dodgy cable) and poor front brake (cable needed lube) needed f...
by BasilF
Thu Aug 06, 2020 7:55 am
Forum: Tales Of Woe
Topic: Registering an historic BSA
Replies: 9
Views: 2117

Re: Registering an historic BSA

After the rejection I wrote back on 24th June Saying that ; 1 In 2014 when it was imported, a title document didn't seem to be a requirement. 2 The motorcycle was a wreck when bought and in all probability hadn't been registered for road use in 30 years so was unlikely to have had an American title ...
by BasilF
Tue Jun 23, 2020 2:26 pm
Forum: Tales Of Woe
Topic: Registering an historic BSA
Replies: 9
Views: 2117

Registering an historic BSA

My long delayed application for an historic registration for my US import B50 came back rejected today. I thought that the letter from HMRC saying all import taxes had been paid, together with dating certificate and correct application form would be enough but they are asking for "the original non-U...
by BasilF
Fri Jun 19, 2020 6:44 am
Forum: Tech
Topic: Engine Builder
Replies: 7
Views: 1467

Re: Engine Builder

If you are going to do it yourself then Rupert Ratio's book is a great help.

http://www.ratiopublishing.co.uk/The-Ru ... l-Volume-1