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- Tue Jan 26, 2021 6:50 pm
- Forum: Parts & Bikes wanted
- Topic: B50MX 24T Gear wanted
- Replies: 1
- Views: 48
- Mon Jan 25, 2021 8:56 pm
- Forum: Tech
- Topic: B44 piston into a B40
- Replies: 1
- Views: 101
Re: B44 piston into a B40
Stay away from any NOS shell ie the Vandervell ones as they were Whitemetal. You want Aluminium/run bearings and I would use T100 ones with no oil hole. Small end bush bore 0.7503" to 0.7506" From https://www.bsaunitsingles.com/Archives/Owners_Manuals/B25SS%20B44SS%201969-70%20Workshop%20Manual%2000...
- Thu Jan 21, 2021 8:02 pm
- Forum: Tech
- Topic: Piston ring gap
- Replies: 6
- Views: 192
Re: Piston ring gap
Total seal have their own recommendation, use that not the BSA manual.
- Wed Jan 20, 2021 11:39 am
- Forum: Tech
- Topic: b40g mainshaft/sprocket seal too small ?
- Replies: 4
- Views: 129
Re: b40g mainshaft/sprocket seal too small ?
B40G engines were made from 66 and through to the end of production of the Unit Single. The crankcases followed the changes in the main production versions other than the rear mount and some other minor details. So if the B50 seal is slightly larger then B40G's of the same era will most likely have ...
- Tue Jan 19, 2021 7:57 pm
- Forum: Tech
- Topic: b40g mainshaft/sprocket seal too small ?
- Replies: 4
- Views: 129
Re: b40g mainshaft/sprocket seal too small ?
Your housing must be worn, could you trim the 53mm, they are steel inside although they can be fully coated with rubber so maybe once the rubber is off the OD it may fit but use sealant on the OD as steel outer seals do lead on the OD. I would not like to silicone it in if really loose as wet sumpin...
- Mon Jan 18, 2021 1:16 pm
- Forum: Tech
- Topic: kickstart cotter pin
- Replies: 9
- Views: 281
Re: kickstart cotter pin
Soft so its sacrificial, cotter pins are a lot cheaper than kickstart spindles. Always have spares, change them often before they distort too much, I buy them without the flat and file to suit each kickstart spindle. Triumph flats are not the same as BSA flats but some dealers stock the Triumph cott...
- Sat Jan 16, 2021 1:31 pm
- Forum: Tech
- Topic: New Build Oil Types
- Replies: 9
- Views: 300
Re: New Build Oil Types
Engine and primary are shared, a good non synthetic 20/50W with high ZDDP levels and no friction modifiers for running in.
EP90 for gearbox or an 85W90 or 75w90 modern gear oil.
EP90 for gearbox or an 85W90 or 75w90 modern gear oil.
- Sat Jan 16, 2021 8:55 am
- Forum: Tech
- Topic: B25 iron oil pump on b50
- Replies: 4
- Views: 158
- Fri Jan 15, 2021 10:48 pm
- Forum: Tech
- Topic: B25 iron oil pump on b50
- Replies: 4
- Views: 158
Re: B25 iron oil pump on b50
Only feed gears are wider, so B50 risks sump not being cleared and smoky engine.
- Fri Jan 15, 2021 7:36 pm
- Forum: Tech
- Topic: wet sumping valve
- Replies: 5
- Views: 248
Re: wet sumping valve
They are an accident waiting to happen on shell bearing engines more than roller bearing engines but not by much more. The issue is that gear pumps push oil out much better than they suck it in and are not self priming, so air in the feed line will stop the pump sucking completely. You can mitigate/...
- Fri Jan 15, 2021 3:36 pm
- Forum: Tech
- Topic: Gearbox part numbers and suppliers
- Replies: 12
- Views: 411
Re: Gearbox part numbers and suppliers
No, just to the main body to stop the feedside to return side leak. But you do point out another potential leak route which could be fixed using the same X ring. This route is along a much longer length of shaft inside a hole than the body so will try and see what pressure is needed to force oil up ...
- Fri Jan 15, 2021 3:21 pm
- Forum: Tech
- Topic: b40 main bearing which side?
- Replies: 2
- Views: 62
Re: b40 main bearing which side?
Single roller goes to the driveside which has the heavier load, the ball goes on the lighter loaded timing side.
Or you can go 2 rollers
viewtopic.php?f=60&t=3591
Or you can go 2 rollers
viewtopic.php?f=60&t=3591
- Thu Jan 14, 2021 7:46 pm
- Forum: Tech
- Topic: Gearbox part numbers and suppliers
- Replies: 12
- Views: 411
Re: Gearbox part numbers and suppliers
My fix for shaft leakage, Norton pump in pic but do it on unit since pumps too.


- Thu Jan 14, 2021 7:40 pm
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1145
Re: B50 hydraulic drum brake
Mini drum brakes are 7" so you could use one as a rear brake plate, rears are SLS and 1.25" shoe width, fronts are TLS with 1 .5" show width. Looking at my notes, the BSA brake uses the shoes, springs and snail cams of the late model Morris Minor, not the Mini. I am talking rear brake not front bra...
- Wed Jan 13, 2021 10:14 pm
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1145
Re: B50 hydraulic drum brake
Mini drum brakes are 7" so you could use one as a rear brake plate, rears are SLS and 1.25" shoe width, fronts are TLS with 1 .5" show width.
- Wed Jan 13, 2021 5:50 pm
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1145
Re: B50 hydraulic drum brake
Not sure if the 27:1 recommended ratio for a disc caliper works for a drum brake but here is a table of ratios, don't think it covers the mini slave diameter though but at least it covers the master cylinders.


- Wed Jan 13, 2021 5:44 pm
- Forum: Tech
- Topic: Gearbox part numbers and suppliers
- Replies: 12
- Views: 411
Re: Gearbox part numbers and suppliers
Yes, same parts, one number for the BSA parts books and the other for the TR25W parts books.
- Sun Jan 10, 2021 9:17 pm
- Forum: Tech
- Topic: Gearbox part numbers and suppliers
- Replies: 12
- Views: 411
Re: Gearbox part numbers and suppliers
Can recommend both PES and RIPE, PES more likely to be freshly made.
- Wed Jan 06, 2021 8:20 pm
- Forum: Tech
- Topic: auto decompressor/valve lifter ???
- Replies: 25
- Views: 1043
Re: auto decompressor/valve lifter ???
The Amal choke which works in an odd way, until it drops below the back edge of the slide it does nothing.
- Wed Jan 06, 2021 12:21 am
- Forum: Tech
- Topic: auto decompressor/valve lifter ???
- Replies: 25
- Views: 1043
Re: auto decompressor/valve lifter ???
I fitted a choke, works best after 5 to 10 min stop but needs quickly turning off as it 8 strokes badly.
- Mon Jan 04, 2021 9:03 pm
- Forum: Tech
- Topic: b40 lubrication system modification ?
- Replies: 15
- Views: 548
Re: b40 lubrication system modification ?
Not worked out my scheme yet but it will need an alloy sump plate with a pipe running up high enough above the oil level to grab the air with a reed valve under the sump. Norton version https://nycnorton.com/wp-content/uploads/2018/05/BreatherKit1.jpg I did my own version for my 850 and will post to...
- Mon Jan 04, 2021 8:00 pm
- Forum: Tech
- Topic: b40 lubrication system modification ?
- Replies: 15
- Views: 548
Re: b40 lubrication system modification ?
I am going off the B50 breather, not going to do it again. Too much clutch debris getting into the engine oil and having less choice on the engine oil so as to stop the clutch slipping. So next time I will be using a much smaller open breather but with a one way reed valve, it works on my 850 Comman...
- Mon Jan 04, 2021 4:49 pm
- Forum: Tech
- Topic: B44 piston in a WDB40
- Replies: 8
- Views: 303
Re: B44 piston in a WDB40
C15 push rods are shorter than B40 by 5/16" 7 5/8" long for the B40 and C15 are 7 5/16" I would not be sure that the B44 piston is lighter than the B40, lot of meat in the sides of that slipper piston so weigh before commiting, regardless of that the crank will need rebalancing to suit all the new p...
- Sun Jan 03, 2021 7:23 pm
- Forum: Tech
- Topic: b40 lubrication system modification ?
- Replies: 15
- Views: 548
Re: b40 lubrication system modification ?
The oblong shaped sump engines eg early C15 and B40 up to and including F type are opposite to later square shaped sump engines eg C15G B40G and later WD versions plus C25/B25/B44/B50. Mixing the pipes up kills your engine, early oblong ones the pipes are parallel, later square the pipes crossover i...
- Sun Jan 03, 2021 4:00 pm
- Forum: Tech
- Topic: b40 lubrication system modification ?
- Replies: 15
- Views: 548
Re: b40 lubrication system modification ?
which pipe on the union block is feed and return to oil tank Answers not to hand and workshop is too cold for me to go and look, easy way is to use an oil gun and force oil in the holes and see where the oil comes out on the pump face on the crankcase. The pump is really 2 pumps and the wide gear s...
- Sat Jan 02, 2021 10:58 pm
- Forum: Tech
- Topic: b40 lubrication system modification ?
- Replies: 15
- Views: 548
Re: b40 lubrication system modification ?
Then it will be a G or later and you can do the mod.
- Sat Jan 02, 2021 5:24 pm
- Forum: Tech
- Topic: clutch friction plates
- Replies: 7
- Views: 484
Re: clutch friction plates
Keep your thin plates as long as the tongs are not worn or recoverable and add an extra plate.
- Sat Jan 02, 2021 1:29 pm
- Forum: Tech
- Topic: auto decompressor/valve lifter ???
- Replies: 25
- Views: 1043
Re: auto decompressor/valve lifter ???
Same as on the 31 series Briggs, prone to failure and the loose bits can destroy an engine. Just use the bloody lever on the handlebars.
- Sat Jan 02, 2021 1:27 pm
- Forum: Tech
- Topic: B25 rebuild questions
- Replies: 8
- Views: 602
Re: B25 rebuild questions
Tygon is the best clear tubing, even the rubbish stuff is useful on a new build as you can see the oil flow. After a few months you can ditch the rubbish stuff confident your system is working.
- Fri Jan 01, 2021 10:16 pm
- Forum: Tech
- Topic: b40 lubrication system modification ?
- Replies: 15
- Views: 548
Re: b40 lubrication system modification ?
What version of B40 is your engine, if it's a G then you can do this to send cool oil to the top end.
viewtopic.php?f=65&t=2948
viewtopic.php?f=65&t=2948
- Wed Dec 30, 2020 8:16 am
- Forum: Tech
- Topic: indicators
- Replies: 3
- Views: 303
Re: indicators
And check the indicator bulb in the headlamp, it's connected to both sides but it's normal resistance only allows one side to light up. A short will allow both sides to light up.
- Wed Dec 23, 2020 5:52 pm
- Forum: Tech
- Topic: race tuning 250 and 350
- Replies: 15
- Views: 1032
Re: race tuning 250 and 350
The 4 main stud holes as the longer B44 studs are thicker and if left B40 size would stretch. Square head B44 valves are bigger but also longer so other parts/work is needed but you are still left with an inlet port not as good as on square head. Your B40 military is the same as a B40G case, so cann...
- Wed Dec 23, 2020 8:21 am
- Forum: Tech
- Topic: race tuning 250 and 350
- Replies: 15
- Views: 1032
Re: race tuning 250 and 350
The difference between a 90SS B40 head and a B44 round barrel head is the stud hole size. The 90SS head has bigger valves and ports than a std B40 head.
- Sat Dec 19, 2020 8:05 pm
- Forum: Tech
- Topic: race tuning 250 and 350
- Replies: 15
- Views: 1032
Re: race tuning 250 and 350
The B25 pump does have wider feed gears, the higher flow gets restricted by the plain big end and results in higher pressure if we ignore all the potential oil leak points. The pre B40G cases cannot take the B25 pump, so you need B40G or later cases including B44 cases. The B40G will have other issu...
- Wed Dec 16, 2020 2:55 pm
- Forum: Tech
- Topic: All Stanley Millard Posts ( HPbySTAN )
- Replies: 3
- Views: 882
Re: All Stanley Millard Posts ( HPbySTAN )
And this search is of all the Topics Stan started, so gets to a lot of his technical ones.
171 vs 2700+
search.php?keywords=&terms=all&author=h ... mit=Search
171 vs 2700+
search.php?keywords=&terms=all&author=h ... mit=Search
- Wed Dec 16, 2020 9:18 am
- Forum: P92 Tech
- Topic: French webpage on SM P92
- Replies: 0
- Views: 490
French webpage on SM P92
Google translate does a reasonable job so turn it on first.
http://www.lerepairedesmotards.com/essa ... on-p92.php
http://www.lerepairedesmotards.com/essa ... on-p92.php
- Wed Dec 16, 2020 9:16 am
- Forum: News
- Topic: Stan Millard
- Replies: 20
- Views: 1944
Re: Stan Millard
A sad day, hope the workshop in the sky has a special corner ready for him and a few B50's for his magic to be applied.
Is it possible to setup a forum corner with all his posts in one sub heading.
Is it possible to setup a forum corner with all his posts in one sub heading.
- Sun Dec 06, 2020 5:28 pm
- Forum: News
- Topic: UK will start charging 30% tax on classic Cars.
- Replies: 2
- Views: 360
Re: UK will start charging 30% tax on classic Cars.
The VAT has always been charged, with some useful form filling you can get the normal VAT rate on vehicles down to 5% based on its historic significance. I got my T120R through at 5% VAT by stating it was an export only model, which is correct T120 for UK and an extra R for the US T120R. The fact is...
- Sun Dec 06, 2020 3:14 pm
- Forum: Parts & Bikes wanted
- Topic: Decent Tank Taps
- Replies: 12
- Views: 1020
Re: Decent Tank Taps
Commando taps were always 1/4 BSP to match the tank, they varied in quality as did the Triumph ones before even the Chinese and Indians became involved. The last decent Triumph tap was one made by BAP of Italy but even then they are copied by India. No idea if these are genuine https://www.feked.com...
- Wed Dec 02, 2020 10:44 am
- Forum: Tech
- Topic: B40 Star Close Ratio Gearbox
- Replies: 2
- Views: 360
Re: B40 Star Close Ratio Gearbox
You need the 80/90SS close ratio gearbox. This covers all the variations by part number, as the boxes are thin on the ground complete it gives you the chance to build it up gear by gear. I posted it sideways to give highest resolution, when you download it use an editor to turn it round. https://i.p...