Search found 430 matches

by JB
Wed Oct 21, 2020 10:23 pm
Forum: Tech
Topic: Ok..now its got me mad..spark plug
Replies: 11
Views: 422
Flag: England

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: 177
Flag: England

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: 177
Flag: England

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: 422
Flag: England

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: 742
Flag: England

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: 461
Flag: England

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: 1195
Flag: England

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: 1142
Flag: England

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: 1142
Flag: England

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: 430
Flag: England

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: 984
Flag: England

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: 407
Flag: England

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: 407
Flag: England

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: 1163
Flag: England

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: 840
Flag: England

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: 840
Flag: England

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: 1163
Flag: England

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: 825
Flag: England

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: 1926
Flag: England

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: 1195
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: 1498
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: 1213
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: 1213
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: 1213
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: 734
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: 55
Views: 5534
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: 55
Views: 5534
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: 1099
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: 55
Views: 5534
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: 579
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: 55
Views: 5534
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: 55
Views: 5534
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: 1083
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: 1844
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: 1146
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: 1748
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: 2928
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: 2928
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: 2061
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: 7962
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: