Search found 441 matches

by JB
Mon Jan 18, 2021 3:53 pm
Forum: Tech
Topic: kickstart cotter pin
Replies: 9
Views: 259

Re: kickstart cotter pin

You don't want it too soft though, especially because it's threaded, something like untreated 1.1730/EN8 at least imo. The cotter pin should be fitted from left with the nut on the right...surprising how many times you see them fitted the wrong way around!
by JB
Sun Jan 17, 2021 11:29 pm
Forum: Tech
Topic: woodruff keys
Replies: 8
Views: 324

Re: woodruff keys

. So, in theory, you don't need one on the clutch as it is on a taper, but this tapper is not able to take the force, - not in theory nor in praxis !! this is why PES and NEB making splinned main shafts. <203 Providing everything is assembled correctly then the taper is perfectly able to take the f...
by JB
Wed Jan 13, 2021 10:32 am
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 39
Views: 1039

Re: B50 hydraulic drum brake

What diameter master cylinder are you using please? It's the T140 style that accepts the 71 style Lucas block switches our bikes were fitted with. It might be worth trying out a smaller cylinder from a 125 bike (my daughters Rieju 125 has a very small piston) as the drum brake slave cylinders combi...
by JB
Tue Jan 12, 2021 11:44 pm
Forum: Project bikes
Topic: B25 trials project.
Replies: 87
Views: 10119

Re: B25 trials project.

Hi Beat, the 3 degrees BTDC static timing was the figure from Frank's ignition supplier, B25's only had a 12 degree ATU :idea: :thumb
by JB
Mon Jan 11, 2021 5:33 pm
Forum: Project bikes
Topic: B25 trials project.
Replies: 87
Views: 10119

Re: B25 trials project.

Hi Frank
Some excellent work you are doing with this bike :thumb
Sorry to disappoint you but I think you have got the ignition timing set wrong, 3degrees BTDC should be on the other side of your timing disc!
Timing.jpg
by JB
Thu Dec 31, 2020 12:28 pm
Forum: Tech
Topic: Flow bench Testing in South West England
Replies: 4
Views: 333

Re: Flow bench Testing in South West England

It's for a good condition T140E head that I've modified one cylinder only and left the other std, I want to check the seat flow at 1mm intervals up to 9.5mm, which is the max lift for a Spitfire profile cams.
by JB
Thu Dec 31, 2020 1:05 am
Forum: Tech
Topic: Flow bench Testing in South West England
Replies: 4
Views: 333

Flow bench Testing in South West England

I'm currently working on a project that I'd like some flow bench testing done.

I'm based in the SW of England and I'd be interested to know if there's anyone in this area who can do this? ? Failing that, does anyone here have any recommendations for someone who is able to do this?
by JB
Tue Dec 29, 2020 12:25 pm
Forum: Tech
Topic: B25 rebuild questions
Replies: 8
Views: 533

Re: B25 rebuild questions

Looking very good :thumb The normal trick with these engines is to pour about a 1/4 pint of oil through the oval pushrod inspection cap, that way the oil will drain down past the followers and cam into the sump. Once you've fitted the engine and filled the oil tank then it's the usual trick of remov...
by JB
Mon Dec 21, 2020 2:00 pm
Forum: News
Topic: Stan Millard
Replies: 20
Views: 1774

Re: Stan Millard

Very much saddened to see this news. Stan was a genuine one off, there is no doubt about that, witness the fact that he made his B50's competitive long after it had any right to be against much more modern machinery. He had many talents, we can all testify here, perhaps his greatest was his willingn...
by JB
Sat Nov 28, 2020 1:01 pm
Forum: Tech
Topic: Brake master cylinder.
Replies: 7
Views: 654

Re: Brake master cylinder.

mlb50 wrote: Sat Nov 28, 2020 9:04 am In my experience - Yes it will match the switch body from a 71 onward conical hub brake. Note there are 2 long screws and 2 shorter ones.
+1
by JB
Sat Nov 21, 2020 11:47 am
Forum: News
Topic: BSA Coming back!
Replies: 5
Views: 855

BSA Coming back!

Obviously it remains to be seen if anything emerges from this recent news report but it looks like a new BSA design facility is going ahead here in the UK to be followed by a manufacturing/assembly plant also in the UK. I for one would certainly be interested in a UK based revitalised BSA and if the...
by JB
Wed Oct 21, 2020 10:23 pm
Forum: Tech
Topic: Ok..now its got me mad..spark plug
Replies: 11
Views: 1339

Re: Ok..now its got me mad..spark plug

For what it's worth, I'm running a Champion N3G in my 1971 B25T, with no starting issues whatsoever.
Mid-November cold start at 30 seconds in :thumb
https://www.youtube.com/watch?v=bDnvUzuykxg&t=6s
by JB
Wed Oct 21, 2020 11:04 am
Forum: Tech
Topic: Help! Kickstart Mech and Clutch Arm Reassembly?s
Replies: 5
Views: 829

Re: Help! Kickstart Mech and Clutch Arm Reassembly?s

You probably know this but I couldn't help noticing that in your first picture the gearchange pivot spring adjuster is missing it's 5/16" UNF locknut.
Below is a picture showing the locking nut in position.
Gear Spring Adjustment.jpg
by JB
Wed Oct 21, 2020 10:52 am
Forum: Tech
Topic: Help! Kickstart Mech and Clutch Arm Reassembly?s
Replies: 5
Views: 829

Re: Help! Kickstart Mech and Clutch Arm Reassembly?s

The kickstart assembly all looks okay to me, the first tooth is always relieved on the quadrant to help with the initial engagement of the kickstart. You can trial assemble the outer cover and play around with the clutch operating arm as it's easy to adjust the arm and rack engagement a tooth at a t...
by JB
Wed Oct 21, 2020 10:43 am
Forum: Tech
Topic: Ok..now its got me mad..spark plug
Replies: 11
Views: 1339

Re: Ok..now its got me mad..spark plug

I will have to check what plug I'm using but I have no problems starting my B25T from stone cold and that's without a choke fitted either! Is there plenty of fuel coming out when you tickle the carb? It's possible with care to adjust the tickler either way to increase or decrease the amount the carb...
by JB
Thu Oct 15, 2020 10:57 pm
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1627

Re: B25SS exhaust pipe

If anyone here is struggling with the fit of a poor pattern B25 OIF exhaust pipe there is, from what I can tell, a genuine BSA one for sale here https://www.ebay.co.uk/itm/Triumph-T25-Trailblazer-BSA-B25-Exhaust-Pipe/154060166161?hash=item23deb39411:g:f~YAAOSwm39fRnVa From experience the original BS...
by JB
Thu Oct 15, 2020 10:33 pm
Forum: Parts & Bikes wanted
Topic: Electrical Box Mounting
Replies: 10
Views: 1295

Re: Electrical Box Mounting

Late style electrical box steel lid for sale here https://www.ebay.co.uk/itm/BSA-B25-B50- ... SwXrpfhEEC
by JB
Fri Sep 25, 2020 1:00 pm
Forum: Tech
Topic: GPS Speedometer
Replies: 11
Views: 2120

Re: GPS Speedometer

Steve, nice looking instrument, although from what I've just read in the instructions it would appear that the rev-counter functionality is for multi cylinder engines with 4 cylinders and above!
John
by JB
Tue Sep 22, 2020 11:22 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 2836

Re: tightening head nuts sequence

It's normal for critical bolts, especially connecting rod bolts, to be torqued dry! Triumph once suffered from a series of con-rod bolts breaking on their 650's twins that was traced back to an assembly line working putting a dab of tallow on the threads! Edit: Example copy for T140 Torque settings ...
by JB
Tue Sep 22, 2020 1:23 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 2836

Re: tightening head nuts sequence

The threads should be clean and dry and NOT oiled as the tightening torque will be increased due to the lowered friction caused by the oil! Tightening sequence isn't so important on a single cylinder engine as it is on a multi cylinder engine, as a general rule you just need to tighten in diagonals,...
by JB
Mon Sep 21, 2020 10:22 pm
Forum: Tech
Topic: B25SS Piston
Replies: 7
Views: 1072

Re: B25SS Piston

BSA had the capacity to make their own pistons in house and genuine BSA made pistons were diamond turned and of high quality. Triumph on the other hand bought theirs in, mainly from Hepolite; yet all 250's were made at Small Heath so you'd expect even the Triumph's 250's to be a BSA marked piston? H...
by JB
Wed Sep 09, 2020 8:50 am
Forum: Tech
Topic: B25 Rough Running..missing slightly
Replies: 17
Views: 2195

Re: B25 Rough Running..missing slightly

If it's running and miss-firing as you say and especially so if the carb is old, then there's a good chance that a worn needle jet is causing a regular miss-fire due to richness. Needle jets are really cheap and a new one will completely transform any bike running with a worn one.
by JB
Tue Sep 01, 2020 11:35 pm
Forum: Tech
Topic: B50 oil pressure switch removal
Replies: 8
Views: 1102

Re: B50 oil pressure switch removal

Lucas pressure switch Thread is NPT... not BSP.
You will be able to fit a BSP thread although it will damage the thread in the casting.
by JB
Tue Sep 01, 2020 6:02 pm
Forum: Tech
Topic: B50 oil pressure switch removal
Replies: 8
Views: 1102

Re: B50 oil pressure switch removal

Go careful with this, only going from memory although I'm fairly certain that Lucas used an American 1/8 NPT thread on their oil pressure switches, not BSPT as you'd have expected :shock: Similar to this one https://www.ebay.co.uk/itm/Oil-pressure-switch-replaces-lucas-SOB103-for-CLASSIC-Mini-MG-MGB...
by JB
Fri Aug 21, 2020 9:19 am
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 2480

Re: B25SS Burning Oil

Taking into account BSA's original 0.0005" tolerance on the valve stem diameters then the original factory stem clearance figures are: • Intake: .00020" to .0035" • Exhaust: .0025" to .0040" Which is huge by any modern standard. I made my own B25T's guides from Colsibro and as an experiment I went a...
by JB
Tue Aug 18, 2020 10:41 am
Forum: Tech
Topic: flywheel balancing
Replies: 15
Views: 1766

Re: flywheel balancing

Okay, sorry can't help you there as I've no experience or knowledge of doing this, all I would say is that if done separately it would have to be done between dead centres rather than knife edges/rollers and I guess there will always be an element of friction involved.
by JB
Mon Aug 17, 2020 10:56 pm
Forum: Tech
Topic: flywheel balancing
Replies: 15
Views: 1766

Re: flywheel balancing

I have statically balanced cranks a number of times the limitations of static balancing is that it only balances in one plane, not so bad on a single with a narrow crank, not so good on a twin that really benefits from dynamic balancing that balances in multiple planes. Dynamic balancing uses sensor...
by JB
Mon Aug 17, 2020 10:16 am
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 2480

Re: B25SS Burning Oil

What oil are you using for breaking in? Your better off using a straight 40 grade for running in a cast iron ring & liner set up and then switch to multigrade of your choice after 4-500 miles The piston grading was a factory method for mass assembly allowing piston selection from a stock of graded p...
by JB
Fri Aug 14, 2020 11:30 am
Forum: Tech
Topic: Gearbox vent 1971 B25T
Replies: 10
Views: 1592

Re: Gearbox vent 1971 B25T

Jeff K wrote: Thu Aug 13, 2020 2:03 pm you want a GL4 rated oil and not the GL5.
Jeff
:thumb
by JB
Mon Jun 29, 2020 12:52 pm
Forum: News
Topic: It's the big one
Replies: 12
Views: 2931

Re: It's the big one

Nice one Gerry, hope you had a good birthday :thumb
by JB
Mon Jun 01, 2020 9:15 am
Forum: Tech
Topic: GPS Speedometer
Replies: 11
Views: 2120

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: 2172

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: 1794

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: 1794

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: 1794

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: 1064

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: 57
Views: 8675

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: 57
Views: 8675

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: 1599

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: 57
Views: 8675

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...