www.b50.org

kommando

https://www.ccm-britain.co.uk/?xhtml=xh ... mepage.xsl

https://www.ccm-britain.co.uk/searchfor ... BORE%20PES

kommando

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...

kommando

Total seal have their own recommendation, use that not the BSA manual.

kommando

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 ...

kommando

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...

kommando

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...

kommando

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.

kommando

kommando

Only feed gears are wider, so B50 risks sump not being cleared and smoky engine.

kommando

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/...

kommando

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 ...

kommando

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

kommando

My fix for shaft leakage, Norton pump in pic but do it on unit since pumps too.

kommando

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...

kommando

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.

kommando

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.

kommando

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.

kommando

Can recommend both PES and RIPE, PES more likely to be freshly made.

kommando

The Amal choke which works in an odd way, until it drops below the back edge of the slide it does nothing.

kommando

I fitted a choke, works best after 5 to 10 min stop but needs quickly turning off as it 8 strokes badly.

kommando

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...

kommando

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...

kommando

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...

kommando

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...

kommando

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...

kommando

Then it will be a G or later and you can do the mod.

kommando

Keep your thin plates as long as the tongs are not worn or recoverable and add an extra plate.

kommando

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.

kommando

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.

kommando

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

kommando

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.

kommando

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...

kommando

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.

kommando

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...

kommando

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

kommando

Google translate does a reasonable job so turn it on first.

http://www.lerepairedesmotards.com/essa ... on-p92.php

kommando

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.

kommando

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...

kommando

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...

kommando

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...

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