Search found 378 matches

by JB
Tue Aug 13, 2019 9:51 am
Forum: Tech
Topic: ongoing problem/headlight wire
Replies: 20
Views: 1090
Flag: England

Re: ongoing problem/headlight wire

minetymenace wrote:
Tue Aug 13, 2019 8:41 am
Are the Trumpet Vonniebill ones the same shape?
7 inch headlight with wider yokes, so I doubt it, TR6 Trophy had the same 5 inch headlight as ours but again the yokes are wider so more than likely they're also different.

Hopefully you find a decent replacement :thumb
by JB
Tue Aug 13, 2019 9:48 am
Forum: Tech
Topic: ongoing problem/headlight wire
Replies: 20
Views: 1090
Flag: England

Re: ongoing problem/headlight wire

skippy wrote:
Mon Aug 12, 2019 11:49 pm
At least the alignment looks good.
:laugh Got to give you that LOL
Best go and check mine now :shock:
by JB
Tue Aug 06, 2019 8:11 am
Forum: Tech
Topic: ongoing problem/headlight wire
Replies: 20
Views: 1090
Flag: England

Re: ongoing problem/headlight wire

Just a thought, on these bikes the gap between the yokes is not fixed and there is room to increase or decrease the distance between the yokes. Very good point! As you say the top yoke is adjustable within the gap under the shoulder of the stem nut and can be adjusted up or down by sliding the fork...
by JB
Sat Aug 03, 2019 10:59 am
Forum: Tech
Topic: ongoing problem/headlight wire
Replies: 20
Views: 1090
Flag: England

Re: ongoing problem/headlight wire

I have never had one break, although I've always been aware of the issue, I've run with and without the internal steel bar and I prefer to run with it as it can stop the headlight shell from cracking around the welded nuts inside the headlamp, which has been the only issue I've had with the original...
by JB
Wed Jul 31, 2019 10:39 am
Forum: Parts & Bikes wanted
Topic: OIF speedo drive/gearbox
Replies: 3
Views: 514
Flag: England

Re: OIF speedo drive/gearbox

would a 2:1 drive with a larger axle hole (3/4 inch) be acceptable as a replacement? Yes in my experience it will be fine, I fitted a brand new old stock Smiths 3/4" bore 21/10 drive unit on my B25T. It's not a problem as long as the felt seal is a good fit on the drive collar then the drive unit w...
by JB
Tue Jul 30, 2019 1:00 pm
Forum: Tech
Topic: B40 and B44 motor in OIF chassis
Replies: 7
Views: 1091
Flag: England

Re: B40 and B44 motor in OIF chassis

But the issues that arise from removing it could be crushing of the lower frame rails when bolting on the footrests, plus twisting of these rails when standing on the footrests while riding off road. Do folk have any opinions here? The OIF footrest bolt is a complete pita,it's a known weakness, esp...
by JB
Mon Jul 29, 2019 10:39 am
Forum: Tech
Topic: Crank end feed oil seal loose?
Replies: 2
Views: 390
Flag: England

Re: Crank end feed oil seal loose?

Tricky one really <201 If this was a B25 with its plain big end then the problem would be more of an issue, but with your engine having a roller bearing big end then this is no where near as serious a problem. If it was mine I would probably bond the seal in place; providing it's not a ridiculously ...
by JB
Fri Jul 12, 2019 8:12 am
Forum: Tech
Topic: Final Drive Sprocket
Replies: 21
Views: 1236
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: 2169
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: 6953
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: 6953
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: 692
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: 692
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: 11787
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: 6953
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: 3883
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: 3038
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: 3540
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: 1329
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: 71
Views: 12412
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: 1779
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: 71
Views: 12412
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: 1397
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: 2766
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: 8570
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: 8570
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: 1564
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: 1687
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: 1687
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: 3571
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: 5517
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: 2069
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: 2361
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: 1182
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: 3212
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: 2724
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: 143
Views: 25318
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: 3212
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: 3212
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: 77
Views: 16545
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