www.b50.org

kommando

The Regina does fit tight but that sounds like too tight, have a word with Mark at PES, are the rollers getting into the root of the Talon sprocket teeth or riding high. The B40WD and B44 cases are the same and I have ran the same setup 28 tooth main sprocket and 72 link chain on a B40 with no issues.

kommando

The 20 TPI is the pre OIF rotor nut, so either dropped into the wrong box or a supplier assuming they were the same.

kommando

E T coil was AC as output from alternator was unrectified.

kommando

The Sparx regulator rectified and controls the voltage but it does not have a capacitor so adding one may help. If they changed from single phase to 3 phase alternator and the Sparx unit is the 3 phase unit then you need to have either a resistor plug or plug cap, otherwise the emf from ignition spa...

kommando

Model year is the second of the 2 letters at the start of the matching frame and engine numbers, C is 69, D is 70, first is the month but that ran from Aug to July. So 69 model year ran in production from Aug 68 to July 69 etc. Looks like a 70, why it does not look like the catalogue photo is crysta...

kommando

I opened up the exhaust port to the old pipe diameter and ill go up one tube size for the exhaust.

Never seen one but the 70 model year pipes are supposed to be larger, so 70 pipes may fit you modified head saving the need for custom pipes but then you look to be able to do that anyway ;) .

kommando

Dealer fit via factory supplied kit but full sized clocks may be left over from 69/70 kits that were full sized but that kit had issues with the OIF frame rails.

kommando

Too late, already been mentioned and Madsunday confirmed he is aware of the mod.

kommando

Yes, and the 69 camplate and fork will fit and rectify the earlier gearbox, you can even retro fit it back to the C15/B40 with work to the camplate by adding a bush to the pivot hole.

kommando

The B25, TR25W, B44 SS and VS gearboxes are the same, only the gearbox rear chain sprocket is different.

kommando

I fit a washer on top of the tube so the setup matches the alloy tank arrangement and the spacer then limits the crush on the top rail rubbers and directs it to the large top rubber. It works but no idea if its correct.

kommando

A further problem has emerged, dull heavy knocking when under moderate load when the motor is hot, which gets less when the applying heavier load, up hills etc. Pinking is worst at low revs and under load, the more load the noisier it is but as the revs pick up it goes away, dropping a gear the inc...

kommando

I think someone has got confused with the B25/B44 etc, as MM says the B50 breathes out through the primary, the earlier timed breather was out through a hole in the camshaft when it lined up with a hole in the bush and then out to behind the outer timing cover. Pre B50 you need to block off the cent...

kommando

I have covered this before in here. The B44 and the B40 head gaskets are not the same. run a B44 gasket and you will have leaks. No, the NOS B40 and B44 gaskets are both -048 thick and on 6 stud heads are interchangeable B44 back to B40, early 4 stud B40 gaskets are different and missing the sectio...

kommando

I would take the rockerbox off and check the drain holes for the valve spring recesses are clear all the way down past the barrel/crankcase joint with a long thin piece of wire. Sounds like the exhaust one at least is blocked and the retained oil is being sucked into the valve/guide.

kommando

They all smoke on start up if you primed the engine correctly and used oil on the rings, even a dry ring assembly method will smoke. Until you get the engine under load and get the combustion pressures down under the rings then it will smoke, but leave it too long and the bore will glaze so only run...

kommando

It was posted elsewhere, by a Renold employee selling Renold chain on the side, colour me sceptical. Their Synergy chain has the chance to work but that is not sold by the Motorcycle Renold chain distributor. As a company Renold have abandoned the Motorcycle market, why would you buy a product off a...

kommando

520 is correct, stay away from current Renolds chain. How about Renold chain, or is that what you meant? The quality is suspect, Renold's themselves no longer make any chain they say is suitable for motorcycle use, but allow one distributor to box up chain made by Renold with their brand on the box...

kommando

520 is correct, stay away from current Reynolds chain.

kommando

Normal issue is 3rd, on this one it's open the box and follow the gearbox blueprint procedure outlined in this site. Pay particular attention to clues like bluing on shift forks shims etc, also check the camplate spring including flat plate.

kommando

You need to match any unique features of your engine to known period correct factory racing team mods, a stamp alone is not enough. The stamp does look genuine as the BSA background is still present but its history will no doubt have been lost and could just be a stamp applied later on to factory re...

kommando

Main jets are typically reduced by 10% when moving from Mono to Concentric, that gets the mixture roughly the same. 25 on the pilot but the rest should either be the same or slightly weaker, the mains drop should take care down to 3/4 throttle so dropping the needle one slot should get you close.

kommando

The B44 1/4" stud was cycle for the nut and BSF for the head (odd considering at 1/4" both are 26 tpi so only the thread angle is different) , the hole is short so UNC may have too few threads, I went BSF for the helicoil on heads where the thread was stripped. 5/16 stud for headsteady is BSF into h...

kommando

BSA_WM20 wrote: ↑
Mon Nov 25, 2019 7:50 am

It might be a trick of the angles but the bearing looks to be narrower than the con rod which of course will not work

Trick of angles, these are OEM big end assemblies taken from fully functioning free spinning cranks.

kommando

Nothing like having the parts in your hand. Starting with the Big end insert, one B44 https://i.postimg.cc/xTHx7t5Y/IMG-20191123-102118.jpg one B50 https://i.postimg.cc/FFwCD2jD/IMG-20191123-102241.jpg Now the width Mark was referencing was the distance to the datum points on the crank between where...

kommando

200 ft lbs is correct for B44.

kommando

I will check and post tomorrow, just in case Mark intended to post 67.0 to 67.5 which still leaves you too wide but less error by a large factor.

kommando

Never come across it but I would reach the same assessment based on your investigations. The full correct fix would be to take a few thou off the big end pin tapers, but you have a fully assembled crank and no doubt no precision grinding machine lying idle in your workshop. So grinding a few thou of...

kommando

Happy to be proved wrong

kommando

Brackets for attaching various items differ with annual changes, underneath there is a common frame used from 63 to 70. You can't add the centre stand used on the Roadster to the Enduro without adding some mounting brackets underneath and losing the sump protection plate.

kommando

If you don't have the depth of metal to end the mounting hole before it enters the combustion chamber then the suggestion can't be followed, but if you have choices on positioning then pick the one that gives the depth, the restriction hole does not need to be long as it only to stop the disc of met...

kommando

[*]Manual. As per the pic, typically used on 4 stroke chainsaws etc. Just a tip, there is a known failure with these where the end cap comes off, if the feed hole into the cylinder is large enough for this to pass then you risk it entering the chamber and bouncing around, if the feed hole is smalle...

kommando

Thanks for taking the time to post this info.

kommando

MM +1 Also make sure the camplate can move the full distance for fourth, I reversed a plate once for 1 up 3 down and 4th became hard to get into as the camplate was touching the stop too early, easy filing job to fix. Probably not an issue as in my case it was coupled with a too easy to get 3rd but ...

kommando

Think of the oil pump as 2 pumps, the feed side is critical, the return side is less critical as if it stops returning the feed side will still run under the tank level drops giving a few minutes supply. If the feed side works then testing the return side can be performed as long as the tank is kept...

kommando

From the top of the site

http://www.ripemotorcycles.co.uk/RIPE%20unit.htm

a good place to start. Wassells now have the licence to use the Lucas name, the indicators they do are not bad and use the Lucas logo.

kommando

Spammers have bots trawling the forums for tel numbers and email addresses, so only reveal them in a Private Message.

kommando

I have never worked on a B50 or CCM, best if you use an oil can to force oil into the galleries and trace the route the oil takes, on the B25/B44 the oil for the big end does come out of the oil hole with O ring in the crankcase, then into the inner timing cover and then via the seal that goes over ...

kommando

That is the OPRV oil pressure relief valve, the blocked hole is the shortcut to the sump or oil pump, depending on the year, for oil that exceeds the 50psi the valve opens at. Its only needed for engines with shell bearing big ends which have small clearances and so produce back pressure, in a rolle...

kommando

I started with a frame and set of crankcases, much more doable in the US as the Victor Special was export only and few got sold in UK. I got a lot of parts from US cheap on sea freight before USPS went air only to UK, could only do it now if in US.

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