Search found 1023 matches
- Sun Sep 22, 2019 10:07 am
- Forum: Tech
- Topic: Never change the gearbox oil
- Replies: 7
- Views: 2519
Re: Never change the gearbox oil
Yes third gear tooth for me too which locked the back wheel - in traffic.
- Wed May 15, 2019 10:23 am
- Forum: Int BSA Rally and other meetings
- Topic: April 27th 2019 bsaoc motherlode ride
- Replies: 9
- Views: 4748
Re: April 27th 2019 bsaoc motherlode ride
You're an inspiration 2many, maybe enough for me to fire up my B50 after quite some again sitting in the shed with fuel drain plug and sump plug out. I did at least free-up the clutch a week ago when my 2 year old grandson wanted to sit on 'ampar's mo-bike, but still it sits there like a work of art...
- Mon Jun 26, 2017 9:49 am
- Forum: Tech
- Topic: Kickstart spring fitting technique?
- Replies: 8
- Views: 2618
Re: Kickstart spring fitting technique?
Has Rupert or any one advised that the spring's hook be a loose fit on the quadrant?
- Mon Jun 26, 2017 1:47 am
- Forum: Tech
- Topic: Clutch cover oil seal
- Replies: 9
- Views: 3226
Re: Clutch cover oil seal
Leaking seal problem here recently too. Some seals must be junk, my new one I pressed in by thumb but must have shrunk. It remained on the shaft when the plate was removed and is now too loose in the plate to effectively glue. Just falls through. So I put the old seal back in, which required the use...
- Thu May 18, 2017 2:57 pm
- Forum: Tech
- Topic: Electric Start
- Replies: 635
- Views: 180883
Re: Electric Start
I like how he got the pegs back where they belong. Yes, but looks like the old shin-tickling kick start problem remains. my el. start must be a add on, :thumb Good to see some photos of Doug's latest, at last, not much about officially, as yet. In issue 64 of Old Bike Australasia mag there's a phot...
- Tue May 02, 2017 1:27 pm
- Forum: Tech
- Topic: crush washer on oil filter
- Replies: 2
- Views: 1455
Re: crush washer on oil filter
I didn't know it's proper name, if this is the washer you mean (fibre?)
22.3mm is the diam of it's seat, filter thread diam is 22.05 and washer O.D. would be 28.75
so 7/8" I.D.
22.3mm is the diam of it's seat, filter thread diam is 22.05 and washer O.D. would be 28.75
so 7/8" I.D.
- Sun Apr 30, 2017 5:34 am
- Forum: Tech
- Topic: 20" front tyre (in UK)
- Replies: 11
- Views: 3520
Re: 20" front tyre (in UK)
Been good thanks Barry, been hanging around and can't resist a bit of 20" tyre talk. Seems that in the early 2000s the bikes using 20" were H*nda cr250 & yamahaha yz250 at least, so any dealer of those whatever they are, in UK ? might still have old stock of Dunlop D739 or D756 or Maxxis MaxxCross I...
- Sat Apr 29, 2017 1:29 pm
- Forum: Tech
- Topic: 20" front tyre (in UK)
- Replies: 11
- Views: 3520
Re: 20" front tyre (in UK)
The freshest looking 20" inner tube I've found (recently) is marked "motocross heavy" and made by Dunlop Japan, and is indeed heavy duty thickness.
As a matter of interest.
As a matter of interest.
- Mon Apr 10, 2017 12:33 pm
- Forum: Tech
- Topic: Genuine manual (& parts book)?
- Replies: 3
- Views: 1580
Re: Genuine manual (& parts book)?
I kept my manual for thirty years before getting another unit single. It was bad enough parting with the bike.
The front is a bit faded now so here is a little teaser of the back cover:
(and I've never seen a Rupert Ratio book)
The front is a bit faded now so here is a little teaser of the back cover:
(and I've never seen a Rupert Ratio book)
- Wed Mar 02, 2016 2:47 am
- Forum: Tech
- Topic: Front wheel centering
- Replies: 12
- Views: 3391
Re: Front wheel centering
Pete, your brake-side outboard spokes are already bent at the point where they pass over the hub flange, which forces a slight curve in the rest of the spoke length, accountable to tension and not particularly good engineering practice. Not that it matters to the ignorant or insensitive. However dep...
- Wed Mar 02, 2016 12:53 am
- Forum: Tech
- Topic: Alloy Sump Plate (oil pump scavenge pick-up pipe)
- Replies: 9
- Views: 3132
Re: Alloy Sump Plate (oil pump scavenge pick-up pipe)
grip, twist and pull.Ozevo wrote:(How do you get the oil pump scavenge pick-up pipe out?)
- Mon Feb 15, 2016 11:28 am
- Forum: Tech
- Topic: Sump guard plate
- Replies: 19
- Views: 5927
Re: Sump guard plate
- Wed Feb 03, 2016 5:33 pm
- Forum: Tech
- Topic: Rocker breather valve
- Replies: 25
- Views: 7025
Re: Rocker breather valve
Vacuum may be enough to suck oil through a loosely toleranced oil pump and if so then the scavenge side may also be too loose to return the over-supply of oil ...wet sumping. The timed breather is the only oil escape route. To avoid an oily left leg, stick a clear tube onto the breather outlet atop ...
- Wed Feb 03, 2016 4:08 pm
- Forum: Suppliers and New Products
- Topic: 20 inch tyres
- Replies: 12
- Views: 5972
Re: 20 inch tyres
Hi Stan that's a pedal-bike tire at that link. Probably fit a wm1 but you have to ride around with the front wheel in the air all the time. Apparently there are NOS red tires and blue tires somewhere in USA, left over from the Japanese makes of those corresponding colours brief production of 20" fro...
- Wed Feb 03, 2016 1:52 pm
- Forum: Tech
- Topic: Rocker breather valve
- Replies: 25
- Views: 7025
Re: Rocker breather valve
I think I mentioned this before Pete, but one was made as a special request. Then it snowballed, despite my protests. What would I know, I'm locked in a building with no view out and forced to work! C'mon Mark, you were almost enthusiastic at the time. pesB50rockerbreather.jpg It's a really easy wa...
- Mon Dec 28, 2015 10:43 am
- Forum: Tech
- Topic: B50 Hole in piston
- Replies: 68
- Views: 15793
Re: B50 Hole in piston
Probly, he bloom ingot no ally by.
not a cast iron one anyway.
not a cast iron one anyway.
- Sun Dec 27, 2015 1:31 am
- Forum: Tech
- Topic: Conical hubs B50 vs TR5T
- Replies: 7
- Views: 2256
Re: Conical hubs B50 vs TR5T
Not to dispute what Trevor says but there may not be much metal lost in turning it un-laced first, which should give an indication of how much stress the drum is handling after lacing and you could be lucky - if not adept enough at lacing to retain roundness ? Dunno, I've never tried it, just a thou...
- Sun Dec 27, 2015 12:55 am
- Forum: Tech
- Topic: Clear coat for polished aluminum?
- Replies: 16
- Views: 4721
Re: Clear coat for polished aluminum?
Nothing, but failing any more specific recommendation, as some one suggested here ages ago find out what the aircraft industry uses.
And let us know!
And let us know!
- Sun Dec 27, 2015 12:47 am
- Forum: Tech
- Topic: B50 Hole in piston
- Replies: 68
- Views: 15793
Re: B50 Hole in piston
Eeeeer indeed. Way off there Roadie. How far off is way? About as far as that hole is from the bullseye! Detoation can knock a hole in a piston in less than a minute. And sounds like a backfire in a lawnmower shop. You can run for years on a crumbling big end. Like yanking on the cord of a worn out ...
- Tue Dec 22, 2015 5:42 am
- Forum: Tech
- Topic: B50 Hole in piston
- Replies: 68
- Views: 15793
Re: B50 Hole in piston
IMO incorrect timing alone is unlikely.
Given known good fuel, if my timing was so advanced that it could knock
a hole in the piston before the big-end broke up, it's bound to kick back rather than start-up.
More likely is bad fuel.
http://motorbikewriter.com/fighting-dirty-fuel/
Given known good fuel, if my timing was so advanced that it could knock
a hole in the piston before the big-end broke up, it's bound to kick back rather than start-up.
More likely is bad fuel.
http://motorbikewriter.com/fighting-dirty-fuel/
- Tue Dec 22, 2015 12:28 am
- Forum: Parts & Bikes wanted
- Topic: 20 inch WM1 front rim
- Replies: 5
- Views: 1968
Re: 20 inch WM1 front rim
Hi John, what sort of tyre is it?
New 20" inner tube too or the old one?
Can get new alloy or steel 20" rims: http://www.central-wheel.co.uk/rims/mor ... d_rim.html
New 20" inner tube too or the old one?
Can get new alloy or steel 20" rims: http://www.central-wheel.co.uk/rims/mor ... d_rim.html
Re: Grommets
Hi Peter, a noble endeavor. it would look very non-original & might put people off buying them I'm of the same opinion but the angle works better so har-har to the originality wowsers. As a guide for specifying hardness (in the vein of never ask a question unless you already know the answer), mudgua...
Re: Grommets
Onya Barry, I'm right here as it happens and also surprised I haven't commented.
viewtopic.php?f=2&t=4703
viewtopic.php?f=2&t=4703
- Wed Dec 09, 2015 8:14 am
- Forum: Suppliers and New Products
- Topic: 97-4023
- Replies: 3
- Views: 3612
Re: 97-4023
Particularly if the casing is black rather than (OEM) grey !b50ss17 wrote:Really good news for the cables Brad.
Some would seem to like them an inch or so longer as well.
- Wed Dec 09, 2015 7:29 am
- Forum: Tech
- Topic: Chinese Akront rim quality
- Replies: 61
- Views: 15337
Re: Chinese Akront rim quality
Have a look at the spoke hole angles in this rim, and wonder if it might have been better to adjust some of those angles with a file...
It may be that if that rim was reversed in relation to the hub, it would fit with a conical ?
It may be that if that rim was reversed in relation to the hub, it would fit with a conical ?
- Tue Nov 17, 2015 10:32 pm
- Forum: Tech
- Topic: Chinese Akront rim quality
- Replies: 61
- Views: 15337
Re: Chinese Akront rim quality
Aha Trevor, you old side-valve, long time no post.
"I thought we had lost you"
I was under the apparent mis-impression that most wheel makers imported rims as a long coil and cut off the appropriate size hoops as needed.
"I thought we had lost you"
I was under the apparent mis-impression that most wheel makers imported rims as a long coil and cut off the appropriate size hoops as needed.
- Mon Nov 16, 2015 5:07 am
- Forum: Tech
- Topic: Chinese Akront rim quality
- Replies: 61
- Views: 15337
Re: Chinese Akront rim quality
What the Japanese motorcycle industry did well was looking at their own designs, realising progressive improvements relating to manufacturing techniques and material specs and implementing decisions. Yes, based on selling component conglomeration at little or no profit to undercut competition and m...
- Mon Nov 16, 2015 4:41 am
- Forum: Tech
- Topic: B50 Hole in piston
- Replies: 68
- Views: 15793
Re: B50 Hole in piston
The result of pinging is usually big-end failure.
Dark plug colour - I would think not running lean.
Too little exhaust back-pressure can easily hole a piston.
What Fuel?
Clear photo?
Dark plug colour - I would think not running lean.
Too little exhaust back-pressure can easily hole a piston.
What Fuel?
Clear photo?
- Fri Nov 13, 2015 3:43 am
- Forum: Tech
- Topic: Who has two cam plate springs fitted and what do you think?
- Replies: 14
- Views: 3628
Re: Who has two cam plate springs fitted and what do you thi
makes the spring pressure greater which seems to help with gear selection "Falls" into gear with more pressure but then it takes more pressure (through the gear selection train) to start the cam plate moving again. Of course the cam profile could be modified to compensate. Would be worth looking up...
- Thu Nov 12, 2015 7:01 pm
- Forum: Tech
- Topic: B50 stuck in gear
- Replies: 35
- Views: 6873
Re: B50 stuck in gear
I vaguely recall breaking one in a previous bike but I'm now not so sure if I was an actual victim or a phantom victim in sympathy, it's such a common thing. First part I bought for my current bike, without even looking in the gearbox, was a spare spring to carry about. Turned out to be the wrong pa...
- Thu Nov 12, 2015 12:58 am
- Forum: Tech
- Topic: B50 stuck in gear
- Replies: 35
- Views: 6873
Re: B50 stuck in gear
Another thing I do is scribe a line into the casing at the top of the spring to facilitate refitting as close as possible to correct position 

- Thu Nov 12, 2015 12:46 am
- Forum: Tech
- Topic: B50 stuck in gear
- Replies: 35
- Views: 6873
Re: B50 stuck in gear
It took me a while but I'm there now Perhaps not quite. See where the cam plate has rubbed on the spring and left a wear mark just above the break? The tip of the back plate has acted as a fulcrum, hence the wear mark above the break. If you put the broken spring back in (with it's backing plate) y...
- Mon Nov 02, 2015 2:48 am
- Forum: Tech
- Topic: fuel tap - reseve
- Replies: 2
- Views: 1324
Re: fuel tap - reseve
Not a bad idea though Beat, you have reserve and when that runs out you have reserve 

- Fri Oct 30, 2015 5:32 am
- Forum: Project bikes
- Topic: Newbie!
- Replies: 6
- Views: 2766
Re: Newbie!

What fun

- Fri Oct 30, 2015 4:59 am
- Forum: Tech
- Topic: Gearbox Shift Pattern
- Replies: 7
- Views: 2471
Re: Gearbox Shift Pattern
The reasoning of course is that road racers need to do the up-shift more quickly than shifting down and particularly if banked over it's easier to dab down on the lever whereas off road riders often need to shift down quickly while standing on the pegs and going up steep hills so again, easier and q...
- Tue Oct 27, 2015 9:07 am
- Forum: Tech
- Topic: How to do Wheel Alignment
- Replies: 19
- Views: 5832
Re: How to do Wheel Alignment
I think that's just about where the front wheel should be for the std B50 back wheel to line up with it.Canberra wrote: 6mm closer to the right fork leg.
Same deal as using a pre-OIF TLS front wheel on a OIF axle in the B50.
- Thu Oct 15, 2015 3:09 am
- Forum: Tech
- Topic: B50SS tyres
- Replies: 38
- Views: 7450
Re: B50SS tyres
The 4.50/ K70 is probably 85% profile so would be about the same diameter as 3.50x18 A too low profile compromises contact patch migration per lean angle and steering geometry. Heavy modern bikes sort of need low profile tyres and usually steeper steering rake to compensate. Whereas the B50 is relat...
- Wed Oct 14, 2015 2:27 am
- Forum: Tech
- Topic: B50SS tyres
- Replies: 38
- Views: 7450
Re: B50SS tyres
100/90 will fit between the stays once forced past the fork leg stay mounts but I suggest getting the full profile Metzlers because the bike was designed to use that profile and relative sizes. No time to elaborate at the moment but low profile tyres do not suit bikes as well as they suit cars and a...
- Sat Oct 03, 2015 11:59 am
- Forum: Tech
- Topic: Chaincase oil level?
- Replies: 2
- Views: 1256
Re: Chaincase oil level?
The chain oiler is located in the in-board side of the primary case near the chain runs.
I don't use mine, does any one?
Oil leak while running would normally have to be above static oil level so probably either or both shaft seals.
I don't use mine, does any one?
Oil leak while running would normally have to be above static oil level so probably either or both shaft seals.
- Tue Sep 22, 2015 1:37 pm
- Forum: Tech
- Topic: B50mx Electronic Ignition
- Replies: 22
- Views: 6158
Re: B50mx Electronic Ignition
I have one of your early o-ring caps Mark, just the one, which I carry as a lucky charm which seems to prevent the originals from falling off. 
