Search found 411 matches

by JB
Mon Jun 01, 2020 9:15 am
Forum: Tech
Topic: GPS Speedometer
Replies: 4
Views: 194
Flag: England

Re: GPS Speedometer

Very nice looking bike :thumb

I really like the paint job on the tank, I normally prefer the BSA steel tank version to the Tr****h version you've used, but you've done such a great job with the paint curves that it works really well.
by JB
Mon Jun 01, 2020 9:06 am
Forum: Tech
Topic: B40 triple clamp material
Replies: 13
Views: 322
Flag: England

Re: B40 triple clamp material

Almost certain it would be a steel forging.
by JB
Wed May 20, 2020 10:42 pm
Forum: Tech
Topic: Tyres
Replies: 10
Views: 318
Flag: England

Re: Tyres

Those K82's look an interesting option Malcolm, they appear to be a mixture of the K70 & a K81 and a good range of widths for 18-inch wheel size. :thumb
by JB
Tue May 19, 2020 5:09 pm
Forum: Tech
Topic: Tyres
Replies: 10
Views: 318
Flag: England

Re: Tyres

The K70 is a very good tyre and especially so for a 250, don't forget they were the std fitment on A65's, T120's and T140's until the later ones changes to K81's.
by JB
Tue May 19, 2020 10:20 am
Forum: Tech
Topic: Tyres
Replies: 10
Views: 318
Flag: England

Re: Tyres

Although currently the only unit single I've got that's roadworthy is a B25T model with trail tyres, if and when I get my B50SS Road bike project up and running I would definitely fit Dunlop K70's front and rear, it's similar to what was fitted to these bikes when new and they look spot on, especial...
by JB
Fri May 15, 2020 4:25 pm
Forum: Tech
Topic: Blown main fuse
Replies: 4
Views: 188
Flag: England

Re: Blown main fuse

Sorry to hear that Jerry. It's possible the fuse could have gone for physical reasons and that's why glass fuses are useful, you will be able to see if the fuse has either melted (electrical) or simply broken. If it's failed due to a short circuit then it's not always easy to find the reason why it ...
by JB
Thu May 14, 2020 11:00 am
Forum: Project bikes
Topic: B25 SS CV19 project
Replies: 44
Views: 1248
Flag: England

Re: B25 SS CV19 project

It's worth noting that the original shortened seat base used a front bracket that was 1/2" or so higher... why this was done I've no idea :???:
by JB
Wed May 13, 2020 10:26 pm
Forum: Project bikes
Topic: B25 SS CV19 project
Replies: 44
Views: 1248
Flag: England

Re: B25 SS CV19 project

Hi John and Jerry, My pan is so damaged if Jerry goes down the 2 gallon tank route I would be interested in your pan John. I would just need new good foam and cover to suit, which Leightons can make to suit . Attached shows the bodge from BSA for reducing the foam length. I would be interested if a...
by JB
Wed May 13, 2020 11:56 am
Forum: Parts & Bikes wanted
Topic: 1970 OIF B25 parts.
Replies: 6
Views: 439
Flag: England

Re: 1970 OIF B25 parts.

As Kommando has said, BSA & for that matter Triumph bikes, built from August through to December were built to the next year model spec, hence a late 1970 date will be a 71 model with the 71 model year build finishing at the end of July and so on. General exceptions would be pilot/press models that ...
by JB
Wed May 13, 2020 7:53 am
Forum: Project bikes
Topic: B25 SS CV19 project
Replies: 44
Views: 1248
Flag: England

Re: B25 SS CV19 project

Jerry, looking at your pictures your seat base is clearly wrong for the larger tank, if it helps I have a spare seat base for the larger tank in good condition that I can sell you if you're interested? If you decide you really want to go for the smaller tank and if your seat foam is no longer needed...
by JB
Mon May 11, 2020 8:42 am
Forum: Tech
Topic: B40 Valve seat fit
Replies: 2
Views: 151
Flag: England

Re: B40 Valve seat fit

I don't have a B40 but almost certain it will be the same as B25/B50's with a reverse tapered seat that's cast in, from what I know only certain Triumph engines from the early 70's changed to fully machined heads with the valve seats shrink fitted.
by JB
Fri May 08, 2020 9:43 am
Forum: Project bikes
Topic: B25 SS CV19 project
Replies: 44
Views: 1248
Flag: England

Re: B25 SS CV19 project

Going from your pictures your seat foam and base look usable to me. Remember that when the seat cover is stretched tight it tensions the foam and holds everything together tight. The base also looks good and should repair easily 👍
by JB
Thu May 07, 2020 5:16 pm
Forum: Project bikes
Topic: B25 SS CV19 project
Replies: 44
Views: 1248
Flag: England

Re: B25 SS CV19 project

I would try and reuse the original seat foam if at all possible! The BSA original was moulded to shape and has a variable density due to coring out the moulding and because of this is, in my experience, more comfortable compared to a pattern seat foam I had, I say had because I binned it....it was n...
by JB
Tue May 05, 2020 1:39 pm
Forum: Tech
Topic: MX Exhaust Question
Replies: 7
Views: 417
Flag: England

Re: MX Exhaust Question

The hideous bracket on the frame looks like the strengthened silencer bracket for the twin silencers your bike was originally fitted with, the earlier version was a known weakness that nearly always broke! Your downpipe looks like the original one, try some fine grade wet/dry paper in the area of wh...
by JB
Wed Apr 29, 2020 8:56 pm
Forum: Tech
Topic: B25 piston
Replies: 15
Views: 758
Flag: England

Re: B25 piston

Is this the standard piston for a 1971 B25? None of the illustrations I can find show a split skirt. There appears to be no markings for front and back. There is also a small witness mark on the crown where the sparkplug may have been touching it. Genuine BSA pistons were a solid skirt type and wou...
by JB
Tue Apr 28, 2020 8:08 pm
Forum: Project bikes
Topic: It's finished
Replies: 6
Views: 531
Flag: England

Re: It's finished

Excellent job John and well done for finishing it :thumb You must be well pleased with how it's turned out, I really like the silver frame finish especially compared to BSA's primer grey :roll: It looks to me that you might be doing some greenlaning at some point? If so, I would seriously consider f...
by JB
Thu Apr 16, 2020 5:08 pm
Forum: Tech
Topic: Classic Bike Racks B25 B50 TR5T
Replies: 11
Views: 757
Flag: England

Re: Classic Bike Racks B25 B50 TR5T

20180513_110724.jpg I helped to organise the original batch of these with a another forum member who fortunately had in his possession an old chrome one that was the type that was designed to fit our particular model of bike rather than an awkward universal rack. I originally posted on here in sear...
by JB
Wed Feb 05, 2020 2:53 pm
Forum: Int BSA Rally and other meetings
Topic: Pendine Sep2020
Replies: 7
Views: 1670
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: 7
Views: 1670
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: 1455
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: 6235
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: 1027
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: 1327
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: 1327
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: 1327
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: 2968
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: 2968
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: 1449
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: 1449
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: 1449
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: 1449
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: 2530
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: 1141
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: 3698
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: 3698
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: 3698
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: 3698
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: 1850
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: 2465
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: 1231
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 ...