Search found 1886 matches

by kommando
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...
by kommando
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.
by kommando
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 ...
by kommando
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...
by kommando
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...
by kommando
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.
by kommando
Sat Jan 16, 2021 8:55 am
Forum: Tech
Topic: B25 iron oil pump on b50
Replies: 4
Views: 158

Re: B25 iron oil pump on b50

Yes.
by kommando
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.
by kommando
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/...
by kommando
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 ...
by kommando
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
by kommando
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.

Image
by kommando
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...
by kommando
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.
by kommando
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.

Image
by kommando
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

KiwiB44 wrote: Tue Jan 12, 2021 7:05 am Thanks Kommando, those two seem to have both gears in stock so I’ll go with one of them, the “other” part numbers quoted for gears, are they the equivalent Triumph numbers and the same item?
Yes, same parts, one number for the BSA parts books and the other for the TR25W parts books.
by kommando
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.
by kommando
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.
by kommando
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.
by kommando
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...
by kommando
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...
by kommando
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...
by kommando
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...
by kommando
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...
by kommando
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.
by kommando
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.
by kommando
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.
by kommando
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.
by kommando
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
by kommando
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.
by kommando
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...
by kommando
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.
by kommando
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...
by kommando
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
by kommando
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
by kommando
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.
by kommando
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...
by kommando
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...
by kommando
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...