Search found 371 matches

by JB
Fri Jul 12, 2019 8:12 am
Forum: Tech
Topic: Final Drive Sprocket
Replies: 4
Views: 133
Flag: England

Re: Final Drive Sprocket

According to the manual it's a 1" 3/16 (30.16mm) Whitworth Form thread and the torque setting is 100 lb/ft (13.8Kg/m).

Having said all of that, I've never bothered with a torque wrench and simply done it up "tight as ***k"...if you know what I mean :laugh
by JB
Mon Jun 24, 2019 10:49 pm
Forum: Tech
Topic: 8inch front brake
Replies: 16
Views: 1191
Flag: England

Re: 8inch front brake

The critical part with these brakes has always been that the cams need to be adjusted with the minimum of slack of the operating arms without any binding. The reason this is essential is that the piston on each leading shoe is operated by a crank with the radius created by the slot machined into the...
by JB
Tue Jun 11, 2019 6:36 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 4133
Flag: England

Re: 1000-Series 2/4-stroke Concentrics

Well done on succeeding with your quest of getting that carb to work differently to how it was originally supplied. With my B25T trail bike I approached this from the opposite end from you in that I wanted the fueling to be as good as possible at the bottom end all the way through, simply because cl...
by JB
Wed Apr 10, 2019 11:49 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 4133
Flag: England

Re: 1000-Series 2/4-stroke Concentrics

I stumbled on the Amal Norton spray tube when building a tuned B50SS with a CCM big valve head & MX cam many years ago, I bought a used 32mm carb without realising it was different ( I was a teenager at the time :???: ). The newly built and the much-anticipated engine was totally gutless, even with ...
by JB
Fri Apr 05, 2019 2:05 pm
Forum: Parts & Bikes wanted
Topic: Quality rubber instrument cup
Replies: 5
Views: 422
Flag: England

Re: Quality rubber instrument cup

Just checked his site properly, it appears he has UK made ones Part No 60-2600 for £11 ea, although no pic I'm hopeful you should be ok :cool:
http://www.grintriumph.com/Clocks.htm

John
by JB
Fri Apr 05, 2019 2:00 pm
Forum: Parts & Bikes wanted
Topic: Quality rubber instrument cup
Replies: 5
Views: 422
Flag: England

Re: Quality rubber instrument cup

Hi Brad You could try Grin Triumph in Scotland http://www.grintriumph.com/ I seem to recall him advertising a range of rubber gaiters that were made in the UK using the correct materials meaning that they don't disintegrate like the crap EMGO ones! Whether that's the same with the rubber parts you w...
by JB
Tue Apr 02, 2019 9:25 pm
Forum: Project bikes
Topic: 1971 B50T Victor 500 Restoration.
Replies: 67
Views: 10079
Flag: England

Re: 1971 B50T Victor 500 Restoration.

Keep it up Gene, following this with much interest: :thumb
by JB
Mon Apr 01, 2019 12:22 am
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 4133
Flag: England

Re: 1000-Series 2/4-stroke Concentrics

I wish I could help with a direct answer to your question but I can't, I've only ever owned one 1000 series carb from a CCM 580 which was sold many years ago. I never knew there was a difference between 2t & 4t Amal carb body machining on the central air feed for the jet block, it's not something I'...
by JB
Sun Mar 31, 2019 11:33 pm
Forum: Tech
Topic: Big tank for 1971 B25T
Replies: 30
Views: 2858
Flag: England

Re: Big tank for 1971 B25T

Purely from memory... I seem to recall that the main difference with the aluminium TR5T tanks compared to the similarly shaped aluminium T25T Trailblazer tanks was two extra threaded bosses for a tank strap...memories do play tricks though :???:
by JB
Wed Feb 13, 2019 9:22 am
Forum: Project bikes
Topic: BSA B50T from Trial to Race bike
Replies: 25
Views: 2221
Flag: England

Re: BSA B50T from Trial to Race bike

WOW...what an amazing transformation :thumb
Just from the photos it looks like you've done a high quality job... I'm very interested in reading more about this bike and its build.
Cheers John
by JB
Mon Feb 11, 2019 7:12 pm
Forum: News
Topic: Nigel Rollason RIP
Replies: 9
Views: 2582
Flag: England

Re: Nigel Rollason RIP

Very sad to hear this, I've just been reading about him and his incredible life and especially the part he played in the history and folklore of these great bikes.
by JB
Mon Jan 21, 2019 9:27 am
Forum: Tech
Topic: B25 oil pump drive spacer
Replies: 7
Views: 997
Flag: England

Re: B25 oil pump drive spacer

From memory if you change an early two ball bearing crank to a roller on the drive side you will need to machine the shoulder on the crankshaft on the timing side. The earlier two ball bearing crankshaft was located on the driveside ball bearing. You have to machine the shoulder down that the timing...
by JB
Tue Dec 18, 2018 3:50 pm
Forum: Project bikes
Topic: Typhoon BX60V
Replies: 63
Views: 8973
Flag: England

Re: Typhoon BX60V

minetymenace wrote:
Tue Dec 18, 2018 1:44 pm
How you going to mount the headlamp? With wire stays as per the oifs? I was considering using the Duc 250 wire stays that wrap round the stanchions but had space issues as I have clip-ons. How about an X75 wishbone?
I spy a chrome X75 wishbone in the last picture :ban
by JB
Fri Dec 14, 2018 2:44 pm
Forum: Tech
Topic: Advantages of a Power box/Podtronics over a Zenor Diode
Replies: 10
Views: 1414
Flag: England

Advantages of a Power box/Podtronics over a Zenor Diode

As someone who has only ever used the original Zenor Diode, with a solid state rectifier, on a good number of old Brit bikes and without ever having cause to change, I'm curious as to what the advantages are and if it's worth changing over? I've only ever had one issue with a zenor diode in 30 odd y...
by JB
Thu Nov 15, 2018 2:10 pm
Forum: Project bikes
Topic: Typhoon BX60V
Replies: 63
Views: 8973
Flag: England

Re: Typhoon BX60V

Wow...that's impressive a B50 with a Triumph 5 speed box and an A65 primary drive & case and a 600cc engine too :shock: Fantastic work, looks very good and should be an improvement over the original in a number of ways, it makes a lot of sense as the next generation B50 in the development cycle. :ok...
by JB
Thu Nov 08, 2018 9:30 am
Forum: Tech
Topic: B50T side stand
Replies: 7
Views: 1150
Flag: England

Re: B50T side stand

These break or bend because they are used while the bike is being started. As a prop stand they are fine, as a support to bare the weight of a Heffalump leaping up and down on it while trying to turn the engine over compression, they leave a little to be desired! +1 :thumb If you are going to try a...
by JB
Wed Nov 07, 2018 6:29 pm
Forum: Tech
Topic: Truckle slide
Replies: 20
Views: 1949
Flag: England

Re: Truckle slide

Sounds like you have got a good result from your experiments there Dave.
it would be interesting at some point to compare how yours runs to mine although I've not really had the issues you've described from low down after I'd thrown away the old worn 106 needle jet and eventually ended up with a .105.
by JB
Mon Nov 05, 2018 8:26 pm
Forum: Tech
Topic: cam followers
Replies: 54
Views: 7507
Flag: England

Re: cam followers

The OIF B25 & T25 production run was months before the B50, so it looks like the modified cam followers were introduced on the 250's first :???:
For some reason I thought they were introduced before the OIF bikes although I am not sure of that <201
by JB
Fri Nov 02, 2018 6:24 pm
Forum: Tech
Topic: cam followers
Replies: 54
Views: 7507
Flag: England

Re: cam followers

The thin ones are the earlier ones and the stronger thicker ones came along later, can't remember the change year, something like 1969? It's worth mentioning that the stellite pad is not particularly hard; ones I've tested were in the high 40 Rockwell C range and yet they possess high wear resistanc...
by JB
Fri Oct 26, 2018 11:22 am
Forum: Tech
Topic: Barber Road Race results(failure!)
Replies: 7
Views: 1346
Flag: England

Re: Barber Road Race results(failure!)

It looks like the ball seating is deeper than it needs to be! It also looks like you could probably take 0.080"/0.100" off the top and achieve a greater angular clearance without losing the engagement?

Sorry to see this happen after all the effort to get as far as you did with it.
by JB
Thu Oct 25, 2018 8:48 am
Forum: Tech
Topic: B50T rear shocks
Replies: 12
Views: 1341
Flag: England

Re: B50T rear shocks

No they were std off the shelf items from memory, I'm sure that they will tailor them for you if that's what you want?
by JB
Wed Oct 24, 2018 11:22 pm
Forum: Tech
Topic: B50T rear shocks
Replies: 12
Views: 1341
Flag: England

Re: B50T rear shocks

I have got a set of Hagon 1" longer than std on my B25T and they seem to be very good for the riding that I do and the extra height seems to counteract the larger 21" very well along with a bit more ground clearance... seems to all work well to me ;-) I removed the chrome effect Hagon sticker and pa...
by JB
Mon Oct 08, 2018 10:23 pm
Forum: Tech
Topic: B40 breather
Replies: 25
Views: 3075
Flag: England

Re: B40 breather

The threads of the two rocker box studs either side of the pushrod tunnel can be a cause of leaks, especially if the threads have been repaired with a helicoil...don't ask me how I know this :???:
by JB
Sun Oct 07, 2018 4:23 pm
Forum: Project bikes
Topic: 1971 BSA B50T
Replies: 30
Views: 4699
Flag: England

Re: 1971 BSA B50T

WOW... :shock: That is VERY NICE... :grin: :grin: :grin:
What a fantastic job you have done with this bike, you must be well pleased with the result of this, BSA definitely got the design of these bikes right imo and you've captured this perfectly with your restoration :ok :ok :ok
by JB
Fri Sep 14, 2018 8:16 am
Forum: Tech
Topic: Podtonics or Sparx volytage regulator
Replies: 12
Views: 1774
Flag: England

Re: Podtonics or Sparx volytage regulator

I use a 12 degree AR unit off a Mk 3 electric start Commando on my B25 with stronger springs which gives a very progressive advance curve up to 4,500rpm. It's the last of the Lucas units before the RITA nishers came out and is an improved version compared to what our bikes had originally, it's a str...
by JB
Mon Sep 10, 2018 10:51 pm
Forum: Project bikes
Topic: B44 Victor Special
Replies: 8
Views: 2030
Flag: England

Re: B44 Victor Special

That's a great restoration job you've done there :ok The finished bike looks very impressive :thumb :thumb :thumb
by JB
Tue Aug 21, 2018 6:16 pm
Forum: Parts & Bikes wanted
Topic: Bike Magazine Winter 1971 Issue No 3
Replies: 0
Views: 864
Flag: England

Bike Magazine Winter 1971 Issue No 3

I know this is a long shot...but here goes :???: I've a collection of every Bike magazine from the 1970's from when it first started here in the UK in the Summer of 1971, I'm missing just one issue which is the Winter 1971 which is the 3rd issue. If anyone has or knows of a copy of this, I'd be very...
by JB
Mon Aug 13, 2018 8:59 am
Forum: Tech
Topic: Best valve guides to use.
Replies: 18
Views: 2706
Flag: England

Re: Best valve guides to use.

Jeff, standard valve stem sizes on BSA valves are meant to be different with the exhaust stem always slightly smaller in diameter than the inlet. The reason for this is that they are made to a standard engineering convention call 'Hole Basis' which is the corner stone of engineering Limits & Fits. A...
by JB
Thu Aug 09, 2018 1:07 pm
Forum: Tech
Topic: b50 bottom end
Replies: 15
Views: 2270
Flag: England

Re: b50 bottom end

Agree with BSA_WM20
From memory the dove grey frame colour was dropped around May 1971 the vast majority of B50's were made after that date with black painted frames, unless yours is a rare genuine Dove Grey framed B50 of course?
by JB
Fri Aug 03, 2018 5:44 pm
Forum: Project bikes
Topic: Hammer of the Gods - B50SS Project
Replies: 133
Views: 20933
Flag: England

Re: Hammer of the Gods - B50SS Project

Fantastic result, you've built a thing of beauty, I bet you spend as much time admiring your hard work with this terrific bike as you do using it :lol: :thumb :thumb :thumb
Good tyre choice too, I they look right compared to modern low profile tyres on these bikes.
by JB
Thu Aug 02, 2018 5:16 pm
Forum: Tech
Topic: Best valve guides to use.
Replies: 18
Views: 2706
Flag: England

Re: Best valve guides to use.

I'm jealous of your Sunnen bench hone :lol: I know you don't use carbide ball hones, just warning people here about them as they do seem to get recommended by some people for sizing guides, they're good for certain jobs but not for bronze guides imho. The clearances I'm running in my B25 head with C...
by JB
Thu Aug 02, 2018 2:31 pm
Forum: Tech
Topic: Best valve guides to use.
Replies: 18
Views: 2706
Flag: England

Re: Best valve guides to use.

Jeff, I've read your previous posts on this subject with interest, my experiences is different to yours, I don't think it's better or worse... just different. I've replaced a number of valves and guides over the years on late 1,2 & 3 cylinder BSA & Tri***h bikes using what was available at the time,...
by JB
Wed Jun 13, 2018 6:12 pm
Forum: Project bikes
Topic: Ian Grout's New 73 CCM
Replies: 73
Views: 14664
Flag: England

Re: Ian Grout's New 73 CCM

Brilliant job Ian, you must be well chuffed to have this bike finished and to finally be able to race it :thumb :thumb :thumb
by JB
Fri Jun 01, 2018 8:35 am
Forum: Tech
Topic: Reed Valve Breather issues
Replies: 14
Views: 2480
Flag: England

Re: Reed Valve Breather issues

The timed breather works well on a 250 and the chaincase vented breather on a B50 also works well, if you ever run a clear tube on a B50 chaincase vent you will see oil clinging to the sidewall in ripples that vary with the engine rpm (there's a time lag but it does alter) for this reason it's impor...
by JB
Wed May 30, 2018 8:37 am
Forum: News
Topic: Bit short of cash tried to sell the B50
Replies: 8
Views: 2728
Flag: England

Re: Bit short of cash tried to sell the B50

That's a brilliant written comedy story you have told there, would have loved to have seen that, so funny it makes me laugh every time I read it :laugh :laugh :laugh
by JB
Tue May 29, 2018 5:28 pm
Forum: Tech
Topic: B44 Pushrods 1967-1968
Replies: 2
Views: 1037
Flag: England

Re: B44 Pushrods 1967-1968

I'm not sure if this is right... but that might be around the time when BSA beefed up the cam followers when the foot was made thicker and possibly a shorter pushrod to go with it?

That is purely my guess though :(
by JB
Mon May 28, 2018 6:56 pm
Forum: Tech
Topic: frame problems
Replies: 15
Views: 3140
Flag: England

Re: frame problems

He's not cheap but then the quality of his work is simply brilliant, I was amazed how good a job he did on mine, especially so as it was all done through the filler cap <119
by JB
Mon May 28, 2018 6:45 pm
Forum: Tech
Topic: Front wheel bearings
Replies: 4
Views: 1191
Flag: England

Re: Front wheel bearings

mlb50 wrote:I did. More protection can only be a good thing.
+1 Doing no harm leaving them in place and it just looks right with them there :ok
by JB
Fri May 25, 2018 12:59 pm
Forum: Project bikes
Topic: 1971 B50T Victor 500 Restoration.
Replies: 67
Views: 10079
Flag: England

Re: 1971 B50T Victor 500 Restoration.

Liking what you've done there with the front wheel, I too went for the Valtru rims and with the stainless spokes you've got a something that not only looks good but it should also stay that way :lol: Really good to see the B50T progressing and as Grace Jones once said 'keep it up' :thumb
by JB
Sun May 13, 2018 10:31 pm
Forum: Tech
Topic: Stainless Steel Luggage Rack
Replies: 23
Views: 4205
Flag: England

Re: Stainless Steel Luggage Rack

Well here it is finally and I'm really pleased with how this has all worked out. Many thanks to John for sending his rack off to be copied and also John at classic racks for such a good job. 20180513_110730.jpg 20180513_110724.jpg John from Classic Racks told me he is having issues loading new produ...