www.b50.org

Canberra

I'm beginning to think that there are various quality available on the market. I use thread tape on my taps and it is very difficult to tighten the nut and sealing washers without the tap turning. This means holding the body of the tap when the material is rather prone to deformation damage. I figur...

Canberra

The main problem is the thread into the tank and material used on the taps makes it impossible to tighten the tap securely without it fracturing. The tap body is so soft it easily deforms if you try to hold it whilst tightening and this can cause the seal to fail and hinder the taps rotation. They r...

Canberra

After shearing <218 <218 yet another tank tap made from high quality butter on my 3 gallon B50SS tank I am wondering has anyone found good replacement fuel taps <201 <201 to fit the tank without re-tapping the threads that can mate up with the standard hose fittings :?: Good quality brass would be p...

Canberra

I've been running with the lower clearances as per eebtr7 for great many years. From what I can see lower clearance may give longer valve timing but by small margin and it would depend if the cam is worn anyway so in effect would act as a re-adjustment. The old sit on TDC on firing was included in s...

Canberra

Oh,to be young again (and foolish). Great story, although sad for the nether regions.

Canberra

Very neat
John

Canberra

Hi Beat,
Lynn and I wish you all the best. It'll take time to get strength back so don't over do things without a brace for a while - take it slowly.
John

Canberra

So that's where I have been going wrong all these years

Brilliant

John

Canberra

My CCM rocker box came with capped hole. I just pushed out the cap and the bored hole came with the recess for the o-ring. One day I'll get around to bushing it. That o-ring works until you get a bit of wear in the aluminium's bore then the dreaded oil leaks come. Even replacing o-rings does not wor...

Canberra

I remember that one Jeff. The 10-32 is 60 degree, similar size and works well as a bodge for worn threads. Slightly less TPI but wouldn't be noticed on a standard 2BA nut. Although I doubt if you'd find a deep thread to be tightened into before it becomes a bind. I remember when I worked in a metrol...

Canberra

Knowing BSA it was a way of getting rid of 20 inch stock on hand. Not sure which other BSA models came out with 20 inch. Nothing mentioned on the website but are the tyres road rated?

John

Canberra

Thank you very much Jerry T. Your timing was excellent. Leightons just refurbished a B50H seat for me and they made a foam using yours as a guide. Apparently your seat had a one piece foam as designed specifically for the B50H. I have only seen foams which were cut down longer B50SS versions to suit...

Canberra

Happy Birthday and don't let those germs get by. Have one (or two) glasses of scrumpy from Lynn and I.

Regards again from bottom of the world (or the top whichever way is up).

Canberra

No 2 - same. Must be starting technique or state of ignition coil.

Canberra

Why not have a word with your local exhaust shop? I got one in Canberra to hand build mine which is a lot more complicated that what you are looking for and it is 1 3/4 OD. It needed a few extra bends to bring it under the frame and out of the way of the kick start which is still a standard part. I ...

Canberra

Hopefully we can all escape lock-down and get some warmth. I ended up respraying the bike and doing some work on other parts. I used a Ford paint which I thought I could get everywhere years ago. Tango was nice but only ever used on 69 x V8 race bred XB falcons so have to get it specifically mixed a...

Canberra

Could it be the original hepolite piston had a long skirt. Maybe they needed the liner to be at a sufficient length but the con rod and bottom of the liner proved a conflict. That created the need for the cut outs on the lower sleeve. With modern short skirt pistons maybe the liner could be shorter ...

Canberra

Hi Skippy, I see a little birthday cake against your recent posts. Hope all is well and you get a chance to get out for a drink (alcoholic or not) to celebrate.

Happy returns, Regards, John

Canberra

There are a range of electronic ignitions on the market nowadays and we all have preferences and comments on them. Boyer had to upgrade their units as the earlier ones was severely affected by even a small battery drop. Pazon which I am using recommend replacing most original ignition components alt...

Canberra

How is the battery? I've had the misfortune of running a Boyer with the battery on it's way out. I had huge problems starting until I replaced the battery. I use a different electronic system now which is less prone to voltage drop.

John

Canberra

On the B50 there are two designs for the valve mechanism. The later is spring loaded to release the valve lifter. I changed mine many years ago so am unsure of the parts involved. I agree with Momus. Welding may bring up more issues with heat treatment than you're trying to cure. I believe Stan did ...

Canberra

I find it'll come down to what you want yourself. Original type patterns, albeit with better compound material, or go for a more modern sportier tyre. I have fitted Metzlers on mine at moment and they seem OK although I do normally prefer Avons. It came down to price as I find the B50 is rather hung...

Canberra

Jerry,

Does the large tank have a brace underneath going from one half of the saddle to the other? If so, it would be later version which would be worth selling. These larger tanks (with or without the brace) are as rare as the short seats that went with them.

John

Canberra

Being a short arse no wonder the seat on my B50SS feels as high if not higher than the B50T I have

.

This is a warning to anyone considering making a fibreglass version of the seat base

John

Canberra

Jerry,

Same dimension as mine 305 mm, so no issue with the mount. Mine also is forward in relation to the tank.

Let me know what you decide on use of tank/seat and will pm JB.

Canberra

Hi John and Jerry, My pan is so damaged if Jerry goes down the 2 gallon tank route I would be interested in your pan John. I would just need new good foam and cover to suit, which Leightons can make to suit . Attached shows the bodge from BSA for reducing the foam length. I would be interested if an...

Canberra

Couple of pics to see what BSA did to make the short seat in 71. BSA cut the foam in the centre and lost an inch off the overall length. Certain bodge as the front of the foam is same as the long seat resulting in foam being too narrow at its nose. This stresses the outer cover in use and results in...

Canberra

If you have a TLS brake hub in a 20 inch WM1 rim then a previous owner did that. To my knowledge no B50SS came out from the factory with TLS and 20 inch WM1 front rims. Only the B50T and B50MX used those 20 inch WM1 rims with SLS brake hubs. I know of a few B50T riders who changed the hubs for bette...

Canberra

Jerry, the dual seat/large tank version of the seat is not available. Over a number of years I have given up trying to source. The concept of the works using the longer dual seat/small tank version and cutting the pan off at the front of the pan and taking a strip out of the foam is a bodge but obvi...

Canberra

Hi Jerry, I have the same problem with my seat foam and the base had to be reworked with tinplate. Lot worse condition than yours, your base almost looks pristine! When you touch the hardened sections on the foam it falls apart. I was going to get some foam rubber and slice a section off the top of ...

Canberra

I found after a while the pipe through the primary case comes lose and leaks. I ended up manufacturing one with out of a hydraulic fitting and use a nut on the inside. Only issue is the fitting is vertical and lets oil blow into the breather. I have restricted it and it tees into the 1/2 inch breath...

Canberra

On the BSA frame drawing the datum is through the center of the swinging arm pivot and is parallel to the lower top tube. In no way I would consider that is parallel to the ground. I assume all B50 frames are same. In that case that datum would never relate to the ground as the MX has 21 inch front ...

Canberra

The length of the tube relates to the tank rubbers under the tank and the o-ring. I had to customise mine as I use two thicker rubbers and I also use a wedge shaped washer to straighten up the screw when it is in the frame. The original B50H design included that.

John

Canberra

Hi Webby,

Just checking -2 or 4 valve engine?

John

Canberra

Hi mlb50. There were DVDs created on the P92 and supplied by a site member (see here ) . Not sure if there are any more around. They are interesting as they show quite a few welcome upgrades to the original engine. Sadly they never made it to production. Search on the P92 topic (see here ) . John Ed...

Canberra

Without digging out my drawing what are the reference S holes? They are the ones for the head steady. If they are helicoiling the outer holes why not those? They take more stress than the outer holes.

John

Canberra

Engineering practice in Aluminium is coarse thread. My experience is in huge aluminium covers which are automatically fitted with helicoils for added strength and better wear on disassembly/reassembly with steel on steel thread contact instead of steel screw and bare aluminium. I do realise that wha...

Canberra

As far as I am aware B50 had UNC in the head and UNF on the nuts. I have a CCM head with socket cap screws which recess into the rocker box. You just need to be aware different bolt manufacturers use different head dimensions if you have to replace any. I had a thread give way and used helicoils. I ...

Canberra

Looks like a repeat of a previous year's result with South Africa

. Big

!

Better luck next time.

Canberra

Poop. No more Wales. Looks like I'll have to support England

John

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