www.b50.org

FGF

Sincere apologies Beat for the picture.
I am really a great fan of your project .
I liked this picture which shows the side car cross pionneers in very difficult conditions.
I saw many races when i was younger and this bike discipline is always very hard .
Regards Francois

FGF

Hello Beat ,
When you tell us about your snowboard , do you mean this kind of practice ?

FGF

Hello , The oil pump gasket is very thin near the drills . ( 1 mm on the right side ) It has to stay well tightened. oil_pump_e.jpg The nuts are locked , nylstop or else but the studs seem to be dry fitted at factory. Do you advise to tighten the three studs in the crankcase with Loctite or keep the...

FGF

Thanks a lot Mark and take care in England.

FGF

I forgot Beat ,

Andrea DOVIZIOSO could try your side car when it 'll be ready , he 's free at the beginning of 2021 :

https://www.paddock-gp.com/motogp-video ... te-dessai/

The best developer for you !

FGF

Hello Beat ,

Just a 34 mm bore with original valves , it 'll be a little B50SS cafe racer ...
Not a side car cross SINGLE MONSTER ! ....I'd like to hear it's deep sound

a few weeks on you tube ?

FGF

Little garage cold this season ...
Engine inside the desk , near the heater and the computer :

hardening the Loctite ...

FGF

Thanks for all . i 'd prefer to be careful with the clutch , taper with key . For the timing pinion ( 70-1580 ) , i 'm ready to use a file if the '' 5.08 mm'' is the right value. If the pinion is fitted with a too hight key , the dismounting will be hot ... Has someone the real hight dimension to ve...

FGF

Thanks Gerry , The timing gear is lightly press fitted , so if the woodruff key is too high the gear could be blocked out . there is a gap between the key and the gear which must be respected ... So, i wouldn't like to fit a too high key ...5.08 mm '' maxi '' and i 'm not so skilled than '' BEAT '' ...

FGF

Hello , can you tell me the right way with the woodruff keys ? i 've received two identical keys for the alternator shaft and the timing shaft which have closes diameters. reading '' british unit single '' , i find the dimensions and for these two : ( very useful anyway ) alternator hight : 5.97 mm ...

FGF

hello , just an omission , replacing the timing crank pinion i 'd like to be sure of it 's position : pinion.jpg the front face ( 1 ) with no shoulder outside and the rear face ( 2 ) with the shoulder inside against the worm gear ? is it correct ? the timing mark is on the flat face outside ( red ar...

FGF

An English bike with no leaks ...is it ever an English bike ??
nice work anyway.

FGF

Hello Gerry , No problem for this. It's true that the 3D files are sometimes difficult to translate. But there is a good news , Solidworks recent releases can open CATIA V5 and CREO files directly without step or IGES files. so i can send my original files if need be. at this moment , i prefer a pri...

FGF

After working with my fisrt sofware, I restored both files with a 2016 release of Solidworks with the standard option. (pictures joined) I can make the Step with this release of Solidworks , maybe it can change the restoration for you. My old licence of ProEngineer- CREO is obsolete but i can ask a ...

FGF

Hello , The original file is made with an educational release of a wellknown software ( i prefer to write it in a personal mail ) because i was a mechanical teacher until 2019. When i recover the Step or Iges file with Solidworks ( another 3D software ) there is only a little problem with the Step r...

FGF

Lastly , some good news , fine !

FGF

Hello ,

I 'm always waiting for my oil pump , being overhauled at PES for many weeks ...times are tough !
so , i continue the B50 CAD design .

This assembly avalaible .

FGF

i try to give an access on the GRABCAD website .
to download a file , create an account and download it in the free library.

prefer the second release '' B50_frame_V2.IGS ''

FGF

Hello , I've designed a copy of the B50 frame with my own CAD . i 've used the blueprint of B50.org and some measurements on my own B50SS. a few little functions are missing and some little mistakes , i guess . if you find some , please tell me . next , i'll design the swingingarm and it's spindle w...

FGF

The oil seal with the smaller inner diameter is for the camshaft 40-0679/70-8153. metric 19.05 x 30.22 x 6.3mm The oil seal you require is 40-0243/70-3833 and used on ALL models. metric 21.35 x 30.22 x 6.3mm regards Chris Ripe Motorcycles Thanks Chris , i 'm happy to see that the '' 21.35 mm ID '' ...

FGF

Hello Johnu ,
on my B50SS 1971 the bracket is fitted directly on the two central nuts ,like in the owner 's manual .

FGF

Thanks Ghislain , then i don't understand : if i order a '' 40-0243 '' at PES , Draganfly or British unit single , they say that it 's suitable for the B50 1971 and it 's long sleeve gear bush ... on the picture supplier , i can read on the seal 0.75 - 1.18 - 0.25 '' 0.75 '' so 19.05 mm for the ID t...

FGF

Thanks Ghislain , for you the 40-0243 ( ID too short ) is a C15 part . PES sold it for the B50 and Draganfly sell the same with 0.75 '' as ID for a 40-0243 like PES. 0.75''' is too short for the bush. the B50 's bush is longer than the mainshaft for about 9/10 mm. The seal must be fitted on it for t...

FGF

Hello , i wanted to replace the back plate oil seal with one bought at PES 40-0243 ( 0.75 - 1.187 - 0.25 '') the sleeve gear bushes have been removed by two new ones bought at PES too. sleeve_bush (2).jpg outer diameter of the mounted bush : about 21.5 mm inner diameter of the new oil seal : about 1...

FGF

Hello , i was looking for a good one too. I bought a spare part but the lever and the spindle splines are not fines. i 'm not sure to really understand : the S*zuki spindle ( like this one ) can replace the BSA spindle ? correct diameter and length ... DRZ400_axe.jpg it seems to be more easily found...

FGF

Hello ,

waiting for my oil pump, i 've carried on the Frame file with my CAD .
i 've corrected some mistakes.

i use it to try to design a welded new tank and even new seat.

i can send an IGES or STEP file , if need be...
Francois

FGF

thanks Trevor ,

i 've finished mechanical teaching for a year .
i do enjoy such an accurate demonstration.

reading the posts , the two solutions are reliables :
to use the original head threads ( with your advises of course ! ) or to fit helicoils.

francois

FGF

Nice work Tom , thanks.
i 'd have prefered a solution with no machining , but these studs are really longs.
Francois

FGF

i was a great fan of motocross , younger.
i rode two bultaco 250 in the seventies , ( in the eighties some japaneses too

)

i 'd be glad to see your side car on a picture in action or not ...

FGF

It 's a good news , Thanks eebtr7 ,
you did it on a B50 or the B44 like tridenperu said ?

FGF

If it is the same as a B44 then you only need to use a couple of Allen screws at the right rear, it is these two studs that prevent the rocker box being removed. The rest of of them can stay the same so the issue of the head steady fix doesn't arise. Hello tridenperu , i 'd like to try your way on ...

FGF

hello Beat ,

the neck was in rest for some weeks but the brain always about 8000 rev/min.
take care about the engine anyway ...

next time , kickstarter or ...electric stater ?

Francois

FGF

Hello Beat , always a little sarcastic , you' re right , if the ball can't turn on itself , the pushrod could have an unusual wear ... i just wanted to tell that when the classic suppliers have no stock , the bicycles one have some compliants parts. as you wrote about the frequent engine dissassembl...

FGF

Hello , i found one 5.8 mm ball in a cycle and scooter shop , not a bike shop. these balls are used to make the steering bearing cycles. I fitted it wthout any problem , a little tight but it doesn't fall down like the 5.5 mm one ! i bought after a new one at PES when it was avalaible . i 'm not sur...

FGF

Thanks Beat
I put two because i didn't Know which supplier could sell Some of them to have a larger one.
Momus just gave me à solution.
As i needed PES parts Mark has advised me to keep a little offset .

Two solutions , I am very happy now.

FGF

Sorry Beat ,
what do you mean with '' wrong IMO '' ?

i 'm looking for new thrustwashers and it 's not easy :
i find the B50 genuine parts but no '' calibrated parts '' like B25 's ones.

FGF

Thanks Momus .

almost 0.03 '' , 0.8 mm with cold engine .

is this the BSA B25 value '?

FGF

sorry , i've forgotten ...

third solution : is it a problem to ride with a little offset between the valve stem and the tappet adjuster screw ?
the previous owner of my B50 rode like that , i don't really trust him .

FGF

Thanks Beat . i was curious to know if this problem was very usual on the unit singles . my second photo comes from the Web by a rider wich had this problem too. i 've taken a bit from the rocker arm , a little , for the rocker bore it 's not easy Momus , may be necessary. To choice shims , what abo...

FGF

Hello , removing the B50 rocker box , i find a wrong position for the Exhaust tappet adjuster : the end of the screw '' overcome the chamfer '' . rock_echap.jpg i wanted to fit a larger thrustwasher but the gap is very thin : there is a risk for the rocker to reach the housing. and the gap for the t...

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