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#830163 11/18/20 1:52 am
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So my dad passed away a year ago and he was a bike nut. Restored tons of bikes and taught me so much. I kept one of his bikes an A10 RGS replica, I would have kept more but I live in California and he was in the UK. Anyway I have decided to build a bike in his memory and I aquired a BSA b50mx which I am building up for vintage mx. I am quite far along with the project but here is what I started with. I will post progress pics soon![Linked Image]

BSA 1.jpg
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It probably won't be competitive unless you add lots of trick bits from Mark Cook or Ed V, but they're a fun dirt bike.

20" front tyres seem to be as rare as hens' teeth, so you'll probably need to lace up a 21" rim or find a front wheel that's already been converted. I assume you're going to fit the wheels on the floor to replace the alloy-rim wheels. The 6" SLS front brake is about as useful as jamming your boot on the tyre, but the TLS is way too powerful for dirt and throws the weight distribution right off.

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Good points Shane thanks, most of which I have already taken into consideration.

I have changed the geometry a bit to take some of the slackness out of the rake and increase rear wheel travel. I am making my own tank, seat, swingarm and exhaust.
I did strip and inspect the engine replacing any worn parts. I also switched to an Electrex ignition.
With the wheels I am using the conical hubs (had to repair the front) and have laced them to Buchanans Sun rims and stainless spokes.
Here are some pics of the project along the way.[Linked Image]
[Linked Image]
[Linked Image][Linked Image]

IMG_5373.jpg IMG_5416.jpg IMG_5559.jpg IMG_6364.jpg
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Nice work! I have a friend who campaigns a B50 in AHRMA racing. He is very competitive. He also shows up with a Triumph 650. Good luck with your project.

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johnu #830263 11/18/20 11:29 pm
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Originally Posted by johnu
So my dad passed away a year ago and he was a bike nut... Anyway I have decided to build a bike in his memory and I aquired a BSA b50mx which I am building up for vintage mx.
Condolences on your Dad's passing.

The project looks like a good one. Get after it!


GrandPaul (does not use emoticons)
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Too many bikes to list, mostly Triumph & Norton, a BSA, & some Japanese
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johnu Offline OP
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Originally Posted by GrandPaul
Originally Posted by johnu
So my dad passed away a year ago and he was a bike nut... Anyway I have decided to build a bike in his memory and I aquired a BSA b50mx which I am building up for vintage mx.
Condolences on your Dad's passing.

The project looks like a good one. Get after it!
Thank you.

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johnu Offline OP
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Got number plate backgrounds with dads name and number smile
[Linked Image]

IMG_7163.jpg
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What a tribute; you were blessed to have a father that was a rider. My folks HATED (and I don't use that word lightly) motorcycles.


GrandPaul (does not use emoticons)
Author of the book "Old Bikes"
Too many bikes to list, mostly Triumph & Norton, a BSA, & some Japanese
"The Iron in your blood should be Vintage"
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Moving forward in the project a few months up to current status! Hoping to be done by January then get out there and race the thing smile
[Linked Image]

IMG_7254.jpg
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Very spiffy, so far...


GrandPaul (does not use emoticons)
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Looks amazing! Great attention to detail.

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Just a suggestion, but I can't tell if you put in a new rear crossmember where you replaced the rear subframe? With a twin shock rear suspension, you may want to weld in a new rear cross tube, maybe use the old original one at an angle to clear the rear fender, to stiffen up the rear end. That's what I did when I built my B50 street tracker (although I can't tell you if I needed to, as I don't go around corners quite as fast anymore!)

Tom


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Probably know already, but you should make a tee and join the rear section of the oil tank with the front down tube. Otherwise the rear is just a heat sink. I think I saw a barb hose fitting on the rear section.

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Originally Posted by koncretekid
Just a suggestion, but I can't tell if you put in a new rear crossmember where you replaced the rear subframe? With a twin shock rear suspension, you may want to weld in a new rear cross tube, maybe use the old original one at an angle to clear the rear fender, to stiffen up the rear end. That's what I did when I built my B50 street tracker (although I can't tell you if I needed to, as I don't go around corners quite as fast anymore!)

Tom
Thanks Tom, I did indeed put in a new cross member!

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Originally Posted by DMadigan
Probably know already, but you should make a tee and join the rear section of the oil tank with the front down tube. Otherwise the rear is just a heat sink. I think I saw a barb hose fitting on the rear section.

Thanks, yes I just got done with the plumbing and have done exactly as you suggested. I have a tee close to the junction with the oil inlet at the bottom of the engine. Also an inline filter from the line coming from the back of the frame/tank.

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johnu Offline OP
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Dmadigan, here is the location of the tee.
[Linked Image]

IMG_7295.jpg
johnu #833679 12/18/20 12:04 am
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Only the tank and seat left to finish now on this bike. I have been working on the tank and got the side panel polished today. Hopefully start paint tomorrow. Where you see the black sharpie line in the pic that will be a gold pinstripe with the polished alum panel inside it then the main tank body will be black. I've already decided that I will be making another tank for this bike as this one came out a little larger than I wanted. I treat this as practice;)
[Linked Image]
[Linked Image]
[Linked Image]

IMG_7400 (1).jpg IMG_7410.jpg IMG_7411.jpg
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Very nice indeed!

Keep it up...


GrandPaul (does not use emoticons)
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Started painting the gas tank today. Got the gold on for the pinstripe!
[Linked Image][Linked Image]

IMG_7446.jpg IMG_7444.jpg
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That is nice work man!

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johnu #834561 12/27/20 12:22 am
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johnu Offline OP
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More progress.
[Linked Image]

IMG_7472.jpg
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Look at the exhaust on that!

In the US, do you not have classic scrambling events where the bikes should be somewhere near standard? In the UK, we have pre-65, which has various classes, but generally the bikes are broadly near standard.

[Linked Image from pre65.co.uk]

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johnu Offline OP
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Originally Posted by Dibnah
Look at the exhaust on that!

In the US, do you not have classic scrambling events where the bikes should be somewhere near standard? In the UK, we have pre-65, which has various classes, but generally the bikes are broadly near standard.

[Linked Image from pre65.co.uk]

We do and that is exactly what I will be doing on this bike. It is still eligible for vintage racing, nothing I have done excludes it:) I raced mx in England in the late 70s and early 80's. Here in SoCal the tracks are very different, even some of the vet tracks which I will be racing this bike on are quite challenging compared to the vintage scramble tracks I've seen in the UK.

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Originally Posted by Dibnah
In the UK, we have pre-65, which has various classes, but generally the bikes are broadly near standard.
With Rickmans being bespoke customs, I find it a stretch to consider them even "broadly" near standard...

...except perhaps the ENGINES in them, which may STILL be a stretch...

Last edited by GrandPaul; 12/27/20 6:51 pm.

GrandPaul (does not use emoticons)
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Too many bikes to list, mostly Triumph & Norton, a BSA, & some Japanese
"The Iron in your blood should be Vintage"
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@ Johnu, UK courses definitely two-tier for modern bikes and for pre-65. Pre-65 includes mildly modified road bikes from the 1950s.

@ Grandpaul, I don't have a current copy of the pre-65 regs, but the intention is to allow bikes from the period to race with only minor mods permitted, hence my use of "standard". Perhaps " modified as per period" is a better description.

The pre-65 description is a bit misleading; bikes up to 1974 are permitted, but definitely no Japanese bikes in the solo classes.

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