www.b50.org

roadplough

Yes third gear tooth for me too which locked the back wheel - in traffic.

roadplough

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...

roadplough

Has Rupert or any one advised that the spring's hook be a loose fit on the quadrant?

roadplough

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...

roadplough

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...

roadplough

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.

roadplough

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...

roadplough

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.

roadplough

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)

roadplough

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...

roadplough

Ozevo wrote:(How do you get the oil pump scavenge pick-up pipe out?)

grip, twist and pull.

roadplough

Luckily it's not usually seen from this angle

roadplough

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 ...

roadplough

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...

roadplough

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...

roadplough

Probly, he bloom ingot no ally by.

not a cast iron one anyway.

roadplough

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...

roadplough

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!

roadplough

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 ...

roadplough

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/

roadplough

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

roadplough

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...

roadplough

Onya Barry, I'm right here as it happens and also surprised I haven't commented.

viewtopic.php?f=2&t=4703

roadplough

b50ss17 wrote:Really good news for the cables Brad.

Particularly if the casing is black rather than (OEM) grey !
Some would seem to like them an inch or so longer as well.

roadplough

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...

: not the only alloy front rim on a B50 I've seen like this.

It may be that if that rim was reversed in relation to the hub, it would fit with a conical ?

roadplough

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.

roadplough

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...

roadplough

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?

roadplough

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...

roadplough

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...

roadplough

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

roadplough

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...

roadplough

Not a bad idea though Beat, you have reserve and when that runs out you have reserve

roadplough

pretty good considering the make-shift set up
What fun

roadplough

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...

roadplough

Canberra wrote: 6mm closer to the right fork leg.

I think that's just about where the front wheel should be for the std B50 back wheel to line up with it.
Same deal as using a pre-OIF TLS front wheel on a OIF axle in the B50.

roadplough

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...

roadplough

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...

roadplough

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.

roadplough

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.

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