www.b50.org

midgie

Typical std b50 rod trick, breaks there every time, you were very lucky not to destroy the cases.

midgie

The b50 crankshaft nut is the plain type Steve, its possible to put a 5/8" cycle tap through a 5/8" unf nut, this works a treat.

midgie

A problem I have seen many times, is owners mix up the normal inspection plug and the vented type that has no internal clearance, which then fouls the clutch pushrod adjuster screw.

midgie

Genuine new old stock b50mx engine with factory labels from late 1971.

midgie

Genuine new old stock b50 crankcases for sale, complete with all studs and bearings condition perfect, still has the factory part no. tag. Pm me if interested.

midgie

The offset measured across the brake drum to the edge of the rim for a std wm3 rim is 1. 7/8".

midgie

None of the 250 or 500cc oil in frame singles ever left the factory with a chain oiler, it was blocked off with a fibre washer and a 1/4" unc x 5/8" setscrew. The bsa badged oif 250cc machines also had qty1 screwed breather plug fitted as std. The b50 of course didn't need it with the breather alrea...

midgie

B50 stud centre's are approx 80mm.

midgie

Spot on JB.

midgie

You need the lobe on the cam facing the gearchange quadrant, the slot will be upright. Dab a bit of paint on the top of the adjuster screw to show you its in the correct position and not 180 degrees out,adjustment should then be no more than 90 degrees either way from the vertical position.

midgie

Nice work Gene, looks super.

midgie

The oif 250, and early b50ss/t machines had a hook type spring anchor on the prop stand, this changed to the barrel type on the later ones, both had the cross hatch on the foot.

midgie

minetymenace wrote: ↑
Thu Dec 20, 2018 6:26 pm
Early oif B25 Chris, my is on the left and B50 type gearbox mainshaft and kick start mech..

Yes I agree that's all correct for the b25fs.

midgie

minetymenace wrote: ↑
Thu Dec 20, 2018 6:26 pm
Early oif B25 Chris, my is on the left and B50 type gearbox mainshaft and kick start mech..

Yes I agree that's all correct for the b25fs.

midgie

Bracket shown in shot is the oif b25 item, mounted on the r/h side. Hence not for the b50.

midgie

The later thick foot followers were fitted as std on the oif 250 singles. But I have found on a few of the very early examples the earlier thin foot type had been fitted from the factory. The b50 always used the thick foot type (71-2513) from the start.

midgie

I have used 88mm bore on the standard liner for many years, never had a problem.

midgie

Have found one

midgie

Has anyone got a spare front genuine mudguard they could sell me please? must be in good condition, but not worried about the paint, cheers.

midgie

Just arrived. b50 crankcases superb condition complete with all studs etc. other b50 parts also. pm me for price if interested.

midgie

beat wrote:

midgie

There is no gasket fitted as std between the crankcase and inner timer cover. the factory used a kind of sealant like wellseal. I have seen these gaskets that were fitted after market on some motors I have had in from the usa.

midgie

High winds and non stop rain in the south of the uk, means not much happening on the bike front, well cheesed off.

midgie

It is best if before attempting to remove the inner timing cover, to pull the cotter (split) pin out of the shaft that holds the shift plate, and then pull that shaft out (which holds the shift plate) by using one of the 2ba screws from the cover screwed into that shaft to pull it, which then allow...

midgie

The ignition key was fs series with the steering lock being ejr series numbered 1-50. so two different type of keys. however the steering lock you show here is not the std bsa factory fitment.

midgie

The std b50mx mudguards were stainless. b50ss were painted steel as was the 71 model b50t. 72 model b50t was chrome plated steel.

midgie

Tank sold.

midgie

pm me thanks.

midgie

Don't worry scott, only some of the very early 'v' type b50 pumps had them. most of the b50 pumps are without thrust washers.

midgie

I agree, its so true and made me chuckle.

midgie

I have a nos l/h footrest that you could buy. pm me.

midgie

b50ss home market 3 gallon tank complete with filler cap and taps. very nice condition and clean inside. £150

midgie

Looks great Ian, nice job.

midgie

If it was mine it would have to come to bits, no b50 I have ever owned has been noisey.

midgie

I had a pair of nos genuine mudguards plated for my 72 b50t restoration cost was £300.

midgie

Hi, I need the 5/8 UNF alternator/crankshaft nut please. I'm looking for the one with the shoulder on. I have a collection of 20 tpi versions and shoulderless correct threads bought in error, but not the one I want for a 73 motor. Is there some confusion out there over this thread? The parts book s...

midgie

Check out the wiring first. a 35 amp fuse was fitted as std.

midgie

Thanks for the reply midgie. Now clear. I’m collecting a B50 bottom end and thought that possibly the slotted screw and lock nut was a repair on this particular engine. So folks, I,ll be on the lookout for a barrel,piston and head for this engine! Cheers I can help with barrel/piston. pm me if inte...

midgie

All the b50's had this slotted adjuster to tension the gearchange return spring for more positive selection. only the very last of the b25's had this also.

midgie

That's looking very nice.

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