Search found 394 matches

by JB
Wed Feb 05, 2020 2:53 pm
Forum: Int BSA Rally and other meetings
Topic: Pendine Sep2020
Replies: 3
Views: 178
Flag: England

Re: Pendine Sep2020

Hi Minety, couldn't agree more, my good lady is the same and besides if the hotel's any good it should have a bar ;-)
Cheers John
by JB
Thu Jan 30, 2020 12:46 pm
Forum: Int BSA Rally and other meetings
Topic: Pendine Sep2020
Replies: 3
Views: 178
Flag: England

Re: Pendine Sep2020

Hi Gerry, I'm up for this, any excuse to ride a motorbike around parts of Wales is all I need :grin:
by JB
Wed Jan 29, 2020 10:11 am
Forum: Tech
Topic: B25 no return oil to tank
Replies: 12
Views: 496
Flag: England

Re: B25 no return oil to tank

minetymenace wrote:
Wed Jan 29, 2020 9:31 am
I'm up for that too...19th/20th September 2020, a weekend.... anyone else?
Yes, might be up for that <200
by JB
Wed Jan 15, 2020 12:47 pm
Forum: Project bikes
Topic: BSA B50T from Trial to Race bike
Replies: 29
Views: 4921
Flag: England

Re: BSA B50T from Trial to Race bike

It's a catch tank for all the breathers Minety <200

Very nice build of your race bike Claudio...very impressed :grin:
by JB
Thu Jan 09, 2020 11:33 pm
Forum: Tech
Topic: B25/T25 Factory big Bore and Hop up kits.
Replies: 5
Views: 377
Flag: England

Re: B25/T25 Factory big Bore and Hop up kits.

Jeff
There's a copy of that article on this site Part 1 here viewtopic.php?f=85&t=3325 and Part 2 here viewtopic.php?f=85&t=3326
by JB
Thu Dec 19, 2019 12:52 pm
Forum: Tech
Topic: OIL FEED PIPE THREADS
Replies: 9
Views: 508
Flag: England

Re: OIL FEED PIPE THREADS

Thanks for the info, just compared to another one , can only be a previous owner mod, strange things happen here in deepest darkest Africa !! Back in the day parts were hard to get and often a long way away, so they would get by with what was ever avaliable. Not the first time I’ve come across some...
by JB
Thu Dec 19, 2019 9:28 am
Forum: Tech
Topic: OIL FEED PIPE THREADS
Replies: 9
Views: 508
Flag: England

Re: OIL FEED PIPE THREADS

5/16 24tpi is UNF, 5/16 BSF is 22TPI. Both versions of the oil pipe threads are UNF as you can see from the attached :thumb
BSA Oil Pipe Serv Sheet.jpg
by JB
Wed Dec 18, 2019 11:47 pm
Forum: Tech
Topic: OIL FEED PIPE THREADS
Replies: 9
Views: 508
Flag: England

Re: OIL FEED PIPE THREADS

The crankcase oil feed & return threads on 1971 oif singles is 5/16 UNF for early models which was changed to 3/8 UNF mid season, I think there was even a service sheet on modifying early engines to 3/8 threads.
by JB
Sun Dec 15, 2019 9:33 pm
Forum: Tech
Topic: Fitting Allen screws to rocker box on B50.
Replies: 27
Views: 1256
Flag: England

Re: Fitting Allen screws to rocker box on B50.

Without digging out my drawing what are the reference S holes? They are the ones for the head steady. If they are helicoiling the outer holes why not those? They take more stress than the outer holes. John The S holes are also Helicoiled, they're marked up differently as they use a longer insert th...
by JB
Wed Dec 11, 2019 2:30 pm
Forum: Tech
Topic: Fitting Allen screws to rocker box on B50.
Replies: 27
Views: 1256
Flag: England

Re: Fitting Allen screws to rocker box on B50.

UNC is a stronger thread into an aluminium casting (Std Metric threads are also coarse threads) due to having greater thread depth, remember with the std studs that the tightening torque to the rockerbox is applied by the fine threaded UNF nut. Interesting to note that P92 was going to have all of t...
by JB
Fri Dec 06, 2019 11:42 pm
Forum: Tech
Topic: B50 7" Headlamp
Replies: 10
Views: 661
Flag: England

Re: B50 7" Headlamp

malcward wrote:
Fri Dec 06, 2019 6:48 pm
Yes there was yet another version for the Rocket 3 and Trident, with the 7" shell . Cheers malc
The very same forks and electrical hardware as Triumph/BSA unit 650 twins with twin carbs!
by JB
Fri Dec 06, 2019 10:07 am
Forum: Tech
Topic: B50 7" Headlamp
Replies: 10
Views: 661
Flag: England

Re: B50 7" Headlamp

As far as I'm aware all larger BSA/Triumph's models used wider spaced steel fork yokes with the 7" pancake headlight, the 650 Trophy & Firebird were the only exception and they needed a different wire stay (third version) to take the smaller MCH66 headlight that was fitted across our range of bikes.
by JB
Thu Dec 05, 2019 11:49 pm
Forum: Tech
Topic: B50 7" Headlamp
Replies: 10
Views: 661
Flag: England

Re: B50 7" Headlamp

The only difference between the different export versions would have been the dip pattern fitted to the MCH66 shell, just as there was only style of taillight and indicators irrespective of what market it was sold into. I am as certain as I can be that 7" headlights were never factory-fitted items t...
by JB
Tue Dec 03, 2019 11:28 pm
Forum: Tech
Topic: B50 7" Headlamp
Replies: 10
Views: 661
Flag: England

Re: B50 7" Headlamp

As far as I am aware every Triumph & BSA oil in frame unit single and all of the Triumph C series twin variants, left the factory fitted with a Lucas 5" MCH66 headlight. If it has a 7" headlight it was almost certainly fitted later on.
by JB
Mon Oct 07, 2019 5:14 pm
Forum: Tech
Topic: Different gas cap in 1974?
Replies: 18
Views: 1818
Flag: England

Re: Different gas cap in 1974?

My understanding was that the early cap is known as 2" Monza and the later one was a 2 1/2" Monza and that the sealing washer is different between the two versions.
by JB
Thu Sep 26, 2019 11:32 am
Forum: Tech
Topic: 1974 B50 rear fender longer then the 1973?
Replies: 3
Views: 842
Flag: England

Re: 1974 B50 rear fender longer then the 1973?

The difference between the oif unit singles short rear mudguard and the longer Tr5T mudguard was mainly due to the fitting of the new bigger rectangular Lucas 917 rear light assembly with the aluminium casting. The new tail light assembly was initially introduced in 1973 on the T140 and eventually b...
by JB
Tue Aug 13, 2019 9:51 am
Forum: Tech
Topic: ongoing problem/headlight wire
Replies: 20
Views: 2949
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: 2949
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: 2949
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: 2949
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: 1413
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: 2087
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: 1028
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: 3065
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: 3729
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: 102
Views: 13344
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: 102
Views: 13344
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: 1289
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: 1289
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: 14991
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: 102
Views: 13344
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: 5306
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: 29
Views: 4921
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: 6260
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: 1702
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: 87
Views: 20951
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: 2291
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: 87
Views: 20951
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: 1812
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: 4215
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.