www.b50.org

Hi Chris,

nice bike - are these standard T140 forks?
Enjoy BC!
Jeff

Awesome project!!! Very very nice! This gives me the much needed motivation to continue with the rebuild of my B50

Hi Pete,

would take 2 sets as well. That is one great effort you're doing!
Price is of lesser importance, if you consider the time, frustration and money you spend if cheap scrap quality parts are being used.

Hold on on that rig!
Regards
Jeff B

AWJD wrote [I can't speak with any great authority on this subject but I note that my B50T has 37k on the clock and my B50MX has also had a pretty hard 40 odd years of existence. In both cases, the rod has never let go and I therefore assume this type of failure must be relatively rare.] I can't spe...

Hi all, made one according to Rupert Ratio's pattern for me. It works very well and has enough clearance for all work. It can be laid on the side and is general stable. The drawing in the RR book was good enough for me though I am not a very skilled mechanic and reader of tech drawings. :smile: Jeff

Hi all, I am just in the process of dismantling my B50 engine. Everything is apart and I am going to dismantle the crankshaft now. However, it seems that the removal of the oil drive gear worm and distance piece from the crankshaft is not described in detail anywhere (Haynes, Rupert Ration, works ma...

that's one out of the way. i wonder how the original poster(JeffB) is going Just read this - the piston broke in two on my B50 - it sheard off in the ring groove. Except for a bent pushrod no further damage. I am just dismantling the engine for complete rebuild. Will go slow as this is my first ful...

The TRI-SPARK works very well on my A65 since 2 years now. The compact design attracted me most. No black box. I am very happy with it To me it makes a much higher quality impression than the Boyer with its exposed coils. The Boyer was working fine for 15 years or so, though. However on the B50 I st...

The K&N HU-600 (supposed for Huskys) is a good fit as well. At least that's what I put on my B50.
Outside dia: 152mm
Inside dia: 102mm
Height; 54mm

HTH

Nice bike!!! You did change to a 19" front wheel?!
How do you like it? I have a 19" too and I feel it as a little buit too stiff,feels almost chopper like.
My aim is to change to the original 18".

Hi Tom, the washer is normally not rotating. It is rivetted in place. Eventually it works loose with time. I think it doesn't matter if it rotates or not. Important thing is that it must be there and stay there. I had this washer fall of the fork and the roller fell into the cavity of the gearbox (o...

Hi all, when I purchased my B50 some years ago, the PO told me the bike would have 600cc. I was not sure if it is really true but didn't care as it was running well and reliable. However, after nearly 14000 happy km, the motor suddenly died and I could kick it over without resistance. It took a whil...

My B50 has a 90mm piston and the liner has a wall 1.8mm thick.
So what have I got???

Ha Ha - WM20 you don't know how close you are: haven't measured the compression but the motor blew some time later. I am now about to open it to see what happended.
It will get new rings (and many other parts) now anyway.

Did you find the cause for the problem? Hi all, sorry was off the board for a while-- problem solved. Guess what the trouble actually was: a blocked pilot circuit in the carb!!! I had to poke through the orifice with a thin wire to get it clean. The bike started first kick after that... :roll: A wi...

Hi, have you tried playing with the air screw?
My B50 refused to start until I tweaked the air screw just a little - that was all.
Small issues can cause big trouble.
Good Luck!

Nice find! Looks like a good clean up and a change of fluids will do!

Interesting to know, it is on the historical route 66.

Hi Ian, new AMAL carbs could be a problem. Sometimes there are residues from production blocking the channels. I would dismantle it and poke especially through the pilot circuit from the mixture screw opening with a thin (0.4mm) wire. A blocked pilot circuit made my B50 a non starter. Pressured air ...

I totally agree to Beat's statement about using "good" pistons. Pistons should always be the best available. This really makes a big difference in durability and overall performance I would say. The problem is often that it is very easy to get "economical" priced pistons from one of the known piston...

Hi Arnold, while you're at it, check the condition of the small round washer that prevents the roller from falling off! I've had this problem with a selector fork of my '67 A65. The washer seems to be rivetted on. One day i could not change into top gear anymore. After opening the gearbox I found th...

Actually there are two size seats. I know because I have both, the shorter one for the big tank and the longer one for the small (5-6ltr) tank.
Hth,
Jeff

<212 Nothing aginst SPEEDMASTERs SIR ! <972 Not for a B50 I agree, but it's a top rubber on my '67 A65 . It looks authentic, and has a super grip (wanna see my footrest rubbers???) and is always a source of amazement for fellow riders. ..and no i don't have points in the twin, though in the B50. :mr...

Big thanks for all the hints folks, I will try new lead and plug and all the other things you mentioned as soon as I have time. Unfortunately I have other things to do beside trying to fix the B50 (though this should have absolute priority I agree). I already disantled the points plate cleaned and r...

Hi Bike 18, no unfortunately not yet, just tried it again after checking the valves. It was about to start but didn't. :???: It sparks, has fuel (cleaned the carb completely), now I think it's the ignition timing or the auto advance (however, I still wonder how it can be the ignition as I drove it, ...

Checked the push rods and valve train tonight, all is okay. However, I found the contact breaker cam can be moved along it's axle (screw shaft) some mm's back and forth. Is this what Rupert Ratio means with "When cam came loose from the back plate - a welding spot will fix the problem"? Could this b...

Thanks for the advice!
I have a feeling that it may be the push rods as there is not much more left.
Will keep you posted.

Regards
Jeff

Hi all, took the B50 out for a ride, all was fine, it ran good, stopped for petrol, started her first kick, drove nice twisty roads, steered towards home and accelerated on a straight to 138 km/h (confirmed by digi speedo) sitting upright, all was fine. Drove the last kilometers home and just in fro...

Well done, Rickard!

Very nice bike and fantastic pictures!
I like the rider cap too - a motorcycle for men with caps (sorry ma'am).

Thank's for sharing.

Hi Rickard,
that's Mark Parkers RG250 framed A65 special.
Make a search in the BritBike Forum.
There are a lot of close up photos and the mods
being explained.
Cheers,
Jeff

Just confirmed the number. It's correct. Did CCM stamp their numbers over a BSA pattern? Did CCM produce their own cases or did they use surplus BSA parts? Maybe the BSA pattern was already on the blank space for the engine number when they got the (surplus)cases from BSA? This motor was not offered...

Thanks for the fast info Ed!
The number is stamped over a BSA logo pattern.
What is different from a stock B50 case?

Thanks,
W.

Hi All, I am a new B50 owner. Did so far only about 300km with it, half of that today on this beautiful sunny Sunday- it's 10PM now and I still can't get the silly grin out of my face':smile:' Together with the B50 I've got another 3/4 B50 in parts. The engine has a strange number: 90849758507':?:' ...