Search found 851 matches

by BSA_WM20
Mon Aug 05, 2019 9:59 am
Forum: Tech
Topic: ongoing problem/headlight wire
Replies: 19
Views: 473
Flag: Australia

Re: ongoing problem/headlight wire

It is probably a simple resonance thing. Simple in theory , impossible in practice to work out. The chrome plating makes it worse particularly if the chrome did not get a couple of heavy coats of copper over a highly polished surface so prevent the micro cracking on the chrome becoming a crack initi...
by BSA_WM20
Sun Aug 04, 2019 8:33 am
Forum: Tech
Topic: ongoing problem/headlight wire
Replies: 19
Views: 473
Flag: Australia

Re: ongoing problem/headlight wire

My thoughts would be to take a broken one to a wire fabricator and get one made in a 400 grade of stainless. My B50 had the pancake headlamp so the only other though would be yours are under stress on the smaller headlamp. I also do not remember a heavy steel brace inside the shell. Next questin is ...
by BSA_WM20
Sat Jun 22, 2019 12:05 am
Forum: Tech
Topic: 8inch front brake
Replies: 16
Views: 1708
Flag: Australia

Re: 8inch front brake

To be honest Gerry, I really can not remember. Not much chance of a photo in the immediate future , there are 14 bikes ( or will be bikes ) and about 6 tons of parts between it & the door. The container was an "emergency temporary" storage when I moved. The 2 20 x 10 sheds that are to replace it are...
by BSA_WM20
Thu Jun 20, 2019 12:25 pm
Forum: Tech
Topic: 8inch front brake
Replies: 16
Views: 1708
Flag: Australia

Re: 8inch front brake

Hi in reply to BSA wm20's comment can I ask a couple of questions. First is you recommend a rear brake spring on the rear lever only then go on to describe your brake as having a spring fitted to both levers. Are you able to explain why this is? Second is you don't seem to be recommending a heavier...
by BSA_WM20
Wed Jun 19, 2019 8:20 am
Forum: Tech
Topic: 8inch front brake
Replies: 16
Views: 1708
Flag: Australia

Re: 8inch front brake

The problem is the outer case is a lot heavier than the inner so what happens is the outer just barely moves enough to allow the shoe to stop making contact and the inner takes up all of the slack. The solution is to put a rear brake clock spring on the rear lever. Also make sure that the outer is n...
by BSA_WM20
Sun Jun 02, 2019 3:33 pm
Forum: Tech
Topic: Tube Size
Replies: 4
Views: 613
Flag: Australia

Re: Tube Size

It will all depend upon the quality of the tube. f it is a cheap tube that was very thin to start with and you are now stretching it even further than it was designed to go then it will be more lible to a catrastropic failure. If it is an expensive tube with thicker rubber it will not make any diffe...
by BSA_WM20
Fri May 31, 2019 9:37 am
Forum: Tech
Topic: B44 Alternator Repair
Replies: 7
Views: 808
Flag: Australia

Re: B44 Alternator Repair

[quote=Canberra post_id=77941 time=1559279458 user_id=27] I believe the rotors that were prone to failures on earlier engines were replaced by a modified unit. So only replace with a new rotor and don't look at a second hand one. I think the magnets are stronger as I gather the originals loose magne...
by BSA_WM20
Wed May 29, 2019 9:31 am
Forum: Tech
Topic: b25ss timing cover bung plug/past shortage of B50 kickstart quadrants
Replies: 17
Views: 1322
Flag: Australia

Re: b25ss timing cover bung plug

Interesting. Definately not a B25ss part and not a B40 GA part either Might be for a B40GB. A bit miffed about how it would be for the gearbox oil as that section of the cavity between the inner & outer cover should be dry. If it is full of gear oil then that would make the engine crankcase breather...
by BSA_WM20
Mon May 20, 2019 7:22 am
Forum: Tech
Topic: c15c - B44 type frame
Replies: 19
Views: 1681
Flag: Australia

Re: c15c - B44 type frame

Down here there are 1973, 1974 1975 & 1976 A 65's Most are 71 models, with 72 upgrades fitted and all sorts of engine & frame numbers. A friend had a 1974 A 65 that was 10 numbers away from my USA spec 1973 and had a German compliance plate fitted to the frame & painted Interplod white. Apparently y...
by BSA_WM20
Sat May 04, 2019 6:05 am
Forum: Tech
Topic: Truckle slide
Replies: 20
Views: 2374
Flag: Australia

Re: Truckle slide

I would bend a slightly different way The two pilot circuit holes are very small and in the middle of the bottom of the mixing chamber Thus only the air rushing across the exact centre of the throat will be causing the venturi effect to suck the idle mix out of the tiny idle ports. Concentrating the...
by BSA_WM20
Tue Apr 23, 2019 7:25 am
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 5633
Flag: Australia

Re: 1000-Series 2/4-stroke Concentrics

I have a similar tool. It is called a colortune. No wires no batteries, just a window into the cylinder so you can see the colour of the combustion flame Fairy simple yellow = too rich white = too lean Black = no combustion Blue = just about right. I would have suggested it to MM but he really likes...
by BSA_WM20
Wed Apr 17, 2019 11:40 am
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1835
Flag: Australia

Re: Bsa b40g engine tuning

The B 50 needle roller needs to be treated with a lot of respect. It is a very high speed roller bearing and if used under load at low revs will scuff the cage on the outer race till eventually the cage breaks up. The broken bits of the cage will be hammer welded onto the outer race & the engine wil...
by BSA_WM20
Thu Apr 11, 2019 10:14 am
Forum: Tech
Topic: Remote Oil Filter B40/B44
Replies: 10
Views: 1143
Flag: Australia

Re: Remote Oil Filter B40/B44

And it does make a difference which way the pipes are connected if the filter cartridge has a back flow valve. I use a similar filter but threaded 3/4 x 16 NP. Thus I can use lawn mower filters rather than car filters as I can get them very cheap . Mower filters all have very low bypass valves and n...
by BSA_WM20
Mon Apr 08, 2019 5:58 am
Forum: Tech
Topic: Imperial thread sizes
Replies: 16
Views: 1218
Flag: Australia

Re: Imperial thread sizes

getting way off topic but there was a lot of others factors. The over riding one being a somewhat arrogant belief that the UK was "naturally" better at designing & building motorcycles. Followed by university graduates becoming formula managers with no understanding of the product because all manage...
by BSA_WM20
Sun Apr 07, 2019 4:55 pm
Forum: Tech
Topic: Imperial thread sizes
Replies: 16
Views: 1218
Flag: Australia

Re: Imperial thread sizes

BSA was a good example of a vertically intergrated company They owned coal mines that dug the coal with machines made by BSA, processed by plants made by BSA hauled in trucks built by BSA ( or at least Daimler engines ) burned in furnaces made by BSA to run their factories. They owned the company th...
by BSA_WM20
Sun Apr 07, 2019 3:21 am
Forum: Tech
Topic: Imperial thread sizes
Replies: 16
Views: 1218
Flag: Australia

Re: Imperial thread sizes

Taps and Dies are rated on the percentage of material removed to make the thread. A 100% would have zero clearance between the threads of the nut and bolt and would be very hard to put together. So if you drill the hole before you tap for 100% then you will have full size threads. But if you drill ...
by BSA_WM20
Fri Apr 05, 2019 11:57 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 5633
Flag: Australia

Re: 1000-Series 2/4-stroke Concentrics

MM will most likely post his final results here because he is a man of his word and he said he would.
However if you want to follow the work as it progresses search the same titled thread in the Gold Star section of the Britbike site which is where this thread originated from.
by BSA_WM20
Fri Apr 05, 2019 11:52 pm
Forum: Tech
Topic: Imperial thread sizes
Replies: 16
Views: 1218
Flag: Australia

Re: Imperial thread sizes

As much as it urks me to force a wrong thread into a hole the boys are quite right . All the 1/4" x 26 tpi are whitworth profile ( BSF ). Even tools like thread chasers for a lather are also the wrong profile. OTOH I do have a die set from the 50's where the CEI die is the correct angles. So if you ...
by BSA_WM20
Tue Apr 02, 2019 4:08 am
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 5633
Flag: Australia

Re: 1000-Series 2/4-stroke Concentrics

Same post on a different forum brings different things to mind ... I assume that you have already found this thread... Trevor, I joined B50.org at Shane's urging. He thought someone here might have the answer I seek. Yes, I had found that thread some time ago but it doesn't address my question. Sen...
by BSA_WM20
Mon Apr 01, 2019 2:01 am
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 5633
Flag: Australia

Re: 1000-Series 2/4-stroke Concentrics

Funny how one compartmentalizes ones brain. Same post on a different forum brings different things to mind Stan Millard ( Hp by Stan ) would be the go to person. Fairly sure he did a bit on amal 1000's some time back. He has not really posted much since his hospital visit last year but might respond...
by BSA_WM20
Tue Mar 26, 2019 2:06 pm
Forum: Tech
Topic: B44 Crank Ball Bearing - Sludge trap removal
Replies: 15
Views: 1442
Flag: Australia

Re: B44 Crank Ball Bearing - Sludge trap removal

In that case grind it carefully to match the curve of the plug and make sure you press down really hard. We mount the crank in the press and put about 100kg on the ned of the rattle gun it get Sludge traps out. Even then 1 i5 5 requires the left handed drill and easyouts. If yours is center punched,...
by BSA_WM20
Mon Mar 25, 2019 7:06 am
Forum: Tech
Topic: B44 Crank Ball Bearing - Sludge trap removal
Replies: 15
Views: 1442
Flag: Australia

Re: B44 Crank Ball Bearing - Sludge trap removal

Most of the standard BSA bearings are C3. Critical means instances where running clearances are given in 0.0001". Elsewhere it was cruely suggested that BSA specified C3 to allow for little innacuracey in machining. What is considered critical in 2000 was standard tollerances back in 69. My B40GA ra...
by BSA_WM20
Fri Mar 22, 2019 1:15 am
Forum: Tech
Topic: B50 - Reaming New Camshaft Bushes
Replies: 8
Views: 935
Flag: Australia

Re: B50 - Reaming New Camshaft Bushes

My plans for world domination included my new empire donating me a fully tooled up workshop. Unfortunately, something went wrong in my chosen career path and like most people I've ended up with a shed and dreams of becoming a skilled machinist with tools to match, have evaporated. The abundance of ...
by BSA_WM20
Fri Mar 22, 2019 12:52 am
Forum: Tech
Topic: B50 - Reaming New Camshaft Bushes
Replies: 8
Views: 935
Flag: Australia

Re: B50 - Reaming New Camshaft Bushes

It is not a difficult job and any 1/2 decent machinist with a vertical mill and the right sized tooling can do it. However the problem is the time taken to do the job & the willingness of the customer to pay. Most head reconditioners will have a mill of sufficient accuracy to do the job. Weather the...
by BSA_WM20
Tue Feb 05, 2019 12:32 pm
Forum: Tech
Topic: Prop stand
Replies: 13
Views: 1586
Flag: Australia

Re: Prop stand

The cross hatching was there to prevent slip on hard surfaces like concrete.
by BSA_WM20
Sat Feb 02, 2019 9:26 am
Forum: Tech
Topic: sealing header pipe at head
Replies: 36
Views: 10692
Flag: Australia

Re: sealing header pipe at head

I have used the same method as Stan for decades. Got the port trued round then got the local exhaust shop to expand the pipe till the ID of the pipe is the same as the ID of the port. Run the ngine for a few minutes without a pipe to expand the head then slip the pipe in quickly and allow everything...
by BSA_WM20
Tue Jan 08, 2019 9:10 am
Forum: Tech
Topic: B44 Oil consumption
Replies: 29
Views: 2391
Flag: Australia

Re: B44 Oil consumption

Rule of thumb Smokes heaviest on full throttle acceleration = worn rings / not yet seated rings Smokes heaviest on the over run = worn guides If it had been hond too fine it can take better than 1000 miles to properly bed in & stop smoking and this is regardless of the compression figures. Next is w...
by BSA_WM20
Sun Jan 06, 2019 3:10 pm
Forum: Tech
Topic: New B40 oil leak.
Replies: 25
Views: 2241
Flag: Australia

Re: New B40 oil leak.

We tend to judge bikes by today's standards , not those of when they were made. We have a yard full of Rolls Royces from 1969 to 1974. They all leave puddles of oil on the ground where they stand. Dripping oil was not a problem in the 70's Now they can be made to be oil tight, but is not how they le...
by BSA_WM20
Sun Dec 16, 2018 1:31 am
Forum: Tech
Topic: B50s and modern fuel
Replies: 28
Views: 3399
Flag: Australia

Re: B50s and modern fuel

I presume the paint thinners used to increase the volatiles is cellulose and not white spirit. I just bought the lowest price 5l can of thinners on ebay, it has toluene and a few other volatile contents and dissappears if you leave the top off. Down here toluene is limited to 35% as is benzene . Th...
by BSA_WM20
Sat Dec 08, 2018 3:14 am
Forum: Tech
Topic: Chainguard?
Replies: 4
Views: 959
Flag: Australia

Re: Chainguard?

Apparently Peter came home from the international with pneumonia which is very naughty of him as you are only supposed to take photos back home with you.
So it might be prudent to leave him for a few weeks till he recovers.
by BSA_WM20
Sun Dec 02, 2018 10:06 am
Forum: Int BSA Rally and other meetings
Topic: 2018 BSA International Rally
Replies: 33
Views: 5704
Flag: Australia

Re: 2018 BSA International Rally

Now you have done it.
Beat will have spotted that electric start and will want details.
by BSA_WM20
Sun Dec 02, 2018 10:03 am
Forum: Tech
Topic: Crankcase Breathing
Replies: 22
Views: 3752
Flag: Australia

Re: Crankcase Breathing

taking notes were you John ?
by BSA_WM20
Sun Dec 02, 2018 10:01 am
Forum: Tech
Topic: A Front Brake Light Switch (By AA Milne)
Replies: 16
Views: 2051
Flag: Australia

Re: A Front Brake Light Switch (By AA Milne)

Test the surface? At 50mph, after 250ms the test surface is 18 ft behind you, what you meet on the bend may bear little resemblance to the the bit of road you've left behind. Of course there is a use for the back brake...just thought I'd make use of the wiring for a front brake light switch and kee...
by BSA_WM20
Sat Dec 01, 2018 6:17 am
Forum: Tech
Topic: A Front Brake Light Switch (By AA Milne)
Replies: 16
Views: 2051
Flag: Australia

Re: A Front Brake Light Switch (By AA Milne)

So am I the last person who tests the surface & stands the bike up for proper braking by jabing the rear brake first thus turning the already fitted brake light on ?
by BSA_WM20
Thu Nov 29, 2018 9:00 pm
Forum: Tech
Topic: B50s and modern fuel
Replies: 28
Views: 3399
Flag: Australia

Re: B50s and modern fuel

Big Snip I must admit, knowing that ethanol is hydroscopic, I had never thought about the storage issues in the filling stations. The only solution I can see is to get rid of ethanol in petrol all together. It causes more problems than it solves. I was wondering if anyone had tried additives to sto...
by BSA_WM20
Thu Nov 29, 2018 9:50 am
Forum: Tech
Topic: B25 / B50
Replies: 7
Views: 1116
Flag: Australia

Re: B25 / B50

Are FB well
Phones are for making phone calls.
FB is for telling thieves what you own, where your are and when would be the best time to pay your garage a visit with a big empty truck.
Shame I really missed him on here.
Good to know he is alive and annoying the young-ens.
Thanks for the update.
by BSA_WM20
Thu Nov 29, 2018 6:41 am
Forum: Tech
Topic: B25 / B50
Replies: 7
Views: 1116
Flag: Australia

Re: B25 / B50

which brings up the subject,
Does any one know how Stan is ?
Not heard a thing since he went into the big white house.
by BSA_WM20
Wed Nov 28, 2018 11:03 pm
Forum: Tech
Topic: B25 / B50
Replies: 7
Views: 1116
Flag: Australia

Re: B25 / B50

Mark Cook can weld a boss on the drive side to take the double bearing, weld up the barrel studs and re position then bore out the throat to take the bigger barrel. There is nothing time and money won't cure. If you are going to compete, a 250 will not be competitive against a 500 (obviously), but ...
by BSA_WM20
Wed Nov 28, 2018 10:59 pm
Forum: Tech
Topic: B50s and modern fuel
Replies: 28
Views: 3399
Flag: Australia

Re: B50s and modern fuel

Personal experiences & anadotes about stale fuel means nothing. There is a lot more to it than most people can appreciate. Those who know me & Shane ( the landlord ) will know the houses are 450 meters apart , on his farm. We buy our fuel from the same servo ( BP ) just around the corner. But there ...
by BSA_WM20
Wed Nov 28, 2018 10:22 pm
Forum: Tech
Topic: Crankcase Breathing
Replies: 22
Views: 3752
Flag: Australia

Re: Crankcase Breathing

AFAIK Rex Bunns blog with all of the data he collected from working on his B44 & B50 is still on the web. Everything you could ever want to know on breathing is there. By a long way a through venting system works best with check valves on both ends. In through the top & out through the bottom, accor...