bbenxe's B50T flat/street tracker

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bbenxe
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bbenxe's B50T flat/street tracker

Postby bbenxe » Wed May 24, 2017 3:43 pm

Hullo!

Picked up a semi-running (MOT'd but not very healthy...) B50T a few months ago which would run a for a while and then start misfiring. That all turned out to be related to an ignition coil shorting out when warm because of it's clamp done up far too tight. Found this warning in some Boyer Bransden literature (even though I'm using a Wassel) after the misfiring was fixed by replacing the coil, but then started to come back 150 miles or so later.

Here's the bike as bought with the awful supertrapp that kept falling apart.


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Since then I've put a silencer that works (OK, stays on but doesn't necessarily silence very much... fine with me), replaced 32mm Amal with 30mm as the port hadn't been opened up to match, fitted a reed valve to the crankcase breather which I've strung underneath the tank, added the PES braided oil feed instead of the original hose, and made up a sumpguard. Oh, and very importantly, added some decals to the tank.

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I've also added the PES finned and magnetic plugged sump, but in doing so disturbed the non-return valve by poking up the scavenge tube so have new bits on order to stop it wet sumping now.

Current plans, in rough order are:

-Swap the awful gold bars for some black flat track bars.
-Put on a larger front drive sprocket as have been running out of revs at about 55mph at the moment. Think it's a 17T I've ordered.
-Smarten up the sidepanels.
-Either get rid of of the front mudguard and make up a brace or keep it and polish up the alloy.
Get rid of the red stripes on the rear mudguard.
-Get some paint on the tank.
-Oil filter.
-Fit MX cam.
-Open up the inlet to 32mm
-Get the frame stripped and repainted. It's been painted a metallic blue at some point and done pretty well, then sprayed black over the top which rubbing off in all sorts of places now.

Really enjoying the big single. I've got a little one (Matchless 250) and another big one (S*zuki DR600) but this thing is just so much fun on the road, and I've been very impressed with the 8" TLS front brake thus far.
66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200

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Re: bbenxe's B50T flat/street tracker

Postby minetymenace » Wed May 24, 2017 5:12 pm

:ok
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bbenxe
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Re: bbenxe's B50T flat/street tracker

Postby bbenxe » Tue Jun 06, 2017 2:01 pm

Been putting lots of miles on recently, rides out with friends, the VMCC, and the AJSMOC. Running very well, but really feeling the need for more teeth on drive sprocket. Fortunately Mr Hingley is letting me borrow his pullers if he can find them in his garage so I can put on a 17T sprocket.

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New handlebars look great, and I've made up a fork brace now that I've yanked the front mudguard. Might be going to a 19" rim at some point so left a bit of room for that.

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All the black paint is slowly rubbing off revealing a more successful coat of blue underneath...

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And when I had the front wheel out I noticed the stud for the 'torque arm' (well, that goes into the notch on the forks) has barely enough thread for the nylock that's being used to hold on to. The nut only gets about halfway on before it runs out of stud.

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So two questions:

1) Does that stud look too short? There's a washer between the disc and fork, and then another between fork and nut that could be creating clearance issues but it all slides together nicely at the moment. I'll order another stud to compare.

2) Any suggestions on a product that might help me rub off the rest of the amateur black paint to reveal the blue underneath? Wasn't sure at first but the bike looks a bit tatty, and then I saw this bike and am now tempted...

IMG_20170606_135908 copy.jpg
66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200

bbenxe
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Re: bbenxe's B50T flat/street tracker

Postby bbenxe » Tue Aug 15, 2017 8:12 pm

Well, my BSA is going very well, fractured the kickstart return spring and then vibrated off the gear lever when I forgot to loctite it back on after replacing the spring (fortunately found it on the roundabout right by my office...) recently but really enjoying riding it almost every day apart from that!

Found that a rub down with some paint thinners has revealed the coat of blue underneath. This bike was dispatched to Duarte, California in 1971 and the blue seems a very good quality job. Did any bikes come out of the factory blue...?

blue.jpg


Haven't got around to putting on the 17T gearbox sprocket yet so still feels quite undergeared, but after reading this thread viewtopic.php?f=3&t=7733 I'm even contemplating a 19T... :thumb
66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200

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Re: bbenxe's B50T flat/street tracker

Postby midgie » Sun Aug 20, 2017 2:58 pm

No bikes left the factory blue to my knowledge. I think a 19t gearbox sprocket is making it overgeared, I run a 17t and 52t rear which I find gives good all round performance. but your choice of course.

bbenxe
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Re: bbenxe's B50T flat/street tracker

Postby bbenxe » Mon Sep 25, 2017 8:29 pm

B50 continues to be a great ride, although it took me down to the wire as a simple head gasket replacement nearly lead to me missing the Bristol Distinguished Gentleman's Ride as I found one of the domed nuts holding on the head's oil supply had stripped with very little time to get a new one in the post.

Many thanks to Ian Hingley for offering to take one off his Victor to help me out before the postman came through in my hour of need!

DGR_Ben_5288.jpg
66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200

bbenxe
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Re: bbenxe's B50T flat/street tracker

Postby bbenxe » Mon May 21, 2018 6:33 pm

Been putting lots of miles on the bike recently around Bristol and surrounding countryside, most recently on the VMCC SW Coast run, and out to the Redhill Classic Car and Bike shows.

Here's a recent photo of the bike, frame all stripped back to blue now, MX panels fitted but not yet painted, and new polished alloy mudguards front and back using a Sammy Miller brace.

In terms of gearing, I've gone from to 14-47 to 17-47 gearing on the drive chain. Huge improvement for the sort of riding I do, but first still feels quite short and top still very buzzy on A-roads with my mate on his plunger A10... I've picked up a 19T from Mark so hoping that'll be the final word in the matter.

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Next thing I'm keen to do is fit a 33mm pumper flatslide carb (Mikuni TM) to match the MX cam when I put that in. I don't enjoy not being able to rev the engine quickly without it bogging and going lean, and need to go up to at least 32mm to match the cam anyway.

The first question that needed to be answered was will it fit. To which the answer is almost... Will need studs replacing with bolts, and the mounting face recessed by about 9mm (which it looks there's plenty of room for) on the head to account for the spigot mount.

I'm unlikely to start undertaking the head modifications until winter since I'm enjoying riding the bike so much almost everyday to work and at the weekend currently!

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66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200

bbenxe
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Re: bbenxe's B50T flat/street tracker

Postby bbenxe » Thu May 31, 2018 3:28 pm

Got some proper tyres on as I'm going trail riding on the TET this weekend.

Bike's going well. Rubber mounted all the mudguards, but that gave them enough slack to move around just a little, but little was enough to start clattering into the chain and giving me a hell of a fright... Resolved now.
Attachments
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66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200

bbenxe
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Re: bbenxe's B50T flat/street tracker

Postby bbenxe » Mon Jun 04, 2018 7:32 pm

What a day out! B50 went fantastically well. Broke a clutch lever slipping in a cowpat... But jury rigged a pivot with a zip tie to get some more lanes done before heading home.

Video of the river crossing here: https://www.youtube.com/watch?v=-AvqUGvKlR0
Attachments
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66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200

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Ian Hingley
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Re: bbenxe's B50T flat/street tracker

Postby Ian Hingley » Mon Jun 04, 2018 10:46 pm

So it's OK to borrow my tools, but then you forget to invite me out for some local trail riding?
How does that work then??

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Ian
66 BSA Victor Enduro, 72 BSA Lightning, 62 BSA B40 trials, 89 H*nda Bros 650, 96 Aprilia Moto 6.5, 2000 Aprilia Moto 6.5

bbenxe
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Re: bbenxe's B50T flat/street tracker

Postby bbenxe » Tue Jun 05, 2018 8:12 am

:laugh

Now can't decide whether I do want to use them to put that 19T sprocket on! Still wanted a taller gear riding home, but I wonder whether it would have made first too tall for the some of those trails...

We'll test it together in the South Wales section :thumb
66 Matchless G2 CSR scrambler, 71 BSA B50 street tracker, 81 Montesa 200


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