www.b50.org

Thanks all,
Very helpful and I'll try these recommendations.

Any thoughts on the thread clean up for the fork slider I mentioned? It's actually from a BSA RGS.

HI all, 1. Looking for recommendations for an engineering business in the South West of the UK which can fit an Alpha big end and balance the crank on my B44. I've been using a business in eastern England, but it's a heck of trip up and down. 2. Are there any views on Italian Gandini pistons? Just a...

That's excellent - really helpful thanks!

Thanks, interesting info and history. So I suppose I’m back to my main query - can I fit a B50 kickstart quadrant into my B44 (which has a B44 mainshaft) and simply turn the ratchet mechanism the other way round?

Sorry, not ratchet, quadrants

Hi again, Had to leave this for a couple of weeks, but on it again. I went right through the parts books and only one mainshaft is listed for all B44 models 40-3254. The B50 appears to have just had one as well 57-4344. So is the long splined shaft mentioned actually a B50 one, or a B44 one? Would b...

Hello again all. The 3/4 kickstart quadrant for various seems quite hard to come by now. But B50 type seems to be available. I have a ‘68 B44 motor which lacks a kickstart quadrant. Can I fit a B50 type. I’m aware I’d need the B50 K/S ratchet parts as well, but aside from that, what issues/work need...

Thanks for that info. Appreciated.

Thanks. Yes matches my profile as well, so that’s resolved. Mine came out of a B44 EA numbered motor.

What characteristics can I expect from the GP cam?

Thanks for all the comments.

Both lobes have a flat rather than pointed top, which may suggest the GP profile. The cam is in good shape, no ridges or steps.

Would be interesting to know for sure.

It's on the side of the inner lobe, not on the timing wheel - the V stamp is on the camshaft itself.

The timing wheel is fitted correctly and the timing mark has an H against it, which I was also curious about.

Hi folks,

Working now on two B44 motors. Quick query:

Camshaft has a V stamp on the side of the inner lobe. Which camshaft is this please? Can anyone help?

Thanks for the replies. Spring dragging is a good thought and along the right lines I think. To answer a question, yes, the springs are all the same. I think the problem may be the spring cups dragging on the clutch centre as the plate lists them out. One seemed to be interfering a little when I did...

Hi all, So, the clutch pressure plate refuses to lift evenly, always lifting fully on one side only. Result is bad clutch drag (no slipping) All clutch components brand new Alloy pressure plate Springs are heavy duty, new and all the same length. Spring cups are new and all the same depth. New clutc...

Thanks again for the responses. I've not had a chance to look again at this again in the last couple of weeks, but as I'm waiting for a larger front sprocket, fitting this will give me a chance to look a few things over again. (I built the bike for long distance hill climbing trials and went too far...

Thanks, a good thought. But all mounts are tightened properly

By way of an update. Made an air intake rubber from two right angled reinforced silicon hoses, cut, shut and taped with some decent fuel proof stuff. Looks tidy, seals properly and does the job. Smoking. Pretty much stopped now. Looks like it was the rings that needed bedding in. Knocking. Still an ...

Definitely getting off topic, but enjoyable all the same! By way of an update, the smoke stops when I've been riding for a bit, but tends to be back when restarting the engine - until another few miles are ridden. A further problem has emerged, dull heavy knocking when under moderate load when the m...

Thanks all, mega helpful replies. A few points. The motor is a 1968 B40G, military model, so side points and later oil system/pump are standard, but thanks for the interesting post on the issue with the converted engine Tom. Re Jeff's post on the round BSA/Tri filters. Tried that, but the clearance ...

I should add that it smoked badly from revolution number 1 on start up - before the oil had time to get around the motor. Oil circulation started up OK after a short while, but no difference to smoke levels.

Hi all, I have a B40 motor in a 1971 T25T frame. I’ve posted on this in the past and thanks to everyone who replied on some tech issues when building this combination of bike. One problem remains. How to join the carb to the air filter. The carb on the B40 sits quite far left of centre, so two acute...

Thanks to all for your posts on this. It's appreciated.

Is there a part available that allows oil to be fed to the motor from the rear of the frame on an OIF? Thinking of some sort of 'gland bolt' (wrong word I know) to which an oil feed banjo and pipe can be fitted.

?????

Greetings to all.

Craig.

Is this still active and working properly? All attempts to add my bike were rejected.
Plus the location map throws up a Google error dated 2011.

Craig.

Do you have a photo of the alloy fuel tank?
How much are you looking for?

Craig.

Thanks. I think I'll be trying that solution. Now to find some tube ...

Hi, does anyone have some of the shouldered electrics box bolts they can pass over for a fee? Part number 21-2128 I need three. No one here in the UK seems to be selling these now.

Thanks!

Thanks. I'll try some of this. Maybe I'm worrying too much - oil pressure build up on the roller big ends is low, so reducing the chance of the seal blowing out.

Hi, I'm refurbishing a WD B40 lump. This has the crank end feed oil seal pushed in with no retaining circlip in contrast with later motors that have this circlip. However, the new oil seal is a very easy push fit. I've tried fitting alterative seals from a different supplier, but the same issue aris...

Thanks for the replies re this. All concur with what I've discovered so far and I appreciate the input. Rear engine mounts need spacers as mentioned, I'm having these made at the mo. Plus new rear engine plates, as the much wider rear engine mount casting on the OIF motors has the bolt hole placed f...

That's great - thanks!

Looks to be set up about the same as mine.

Hi all, I'm planning to fit an ex war department B40 motor into an OIF B25/T25T chassis. I also plan to use a B44 motor in the same chassis at a later stage. Any tips, warnings or things to take into account when doing this? I'm already aware of the need for rear engine mount spacing, as the pre OIF...

Hi all, Can anyone advise on the correct depth for the sprocket side rear wheel bearing into a conical hub. My bike is an OIF chassis B25 type from 1971, but the T25T 'badge engineered' version. I'm concerned about sprocket alignment. The wheel I have has had new bearings, but these were fitted to a...