Author Topic: B50MX Ultimate Build  (Read 23052 times)

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Offline big mac

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B50MX Ultimate Build
« on: February 16, 2014, 06:08:31 pm »
So if you were building the best BSA B50MX you could what mods would you make. i,e
Frame mods
Forks to use
shocks
Tank seat combo
Wheels
Plus the engine mods
I would like to get some ideas before I start on a project.
Rory

Offline Tim754

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Re: B50MX Ultimate Build
« Reply #1 on: February 16, 2014, 06:34:18 pm »
The B50mx are a beautiful looking bike in stock trim, lets see best mod for competition use ? Ever heard of Clews Competition Machinery aka CCM. ;)
« Last Edit: February 16, 2014, 06:36:13 pm by Tim754 »
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Offline big mac

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Re: B50MX Ultimate Build
« Reply #2 on: February 16, 2014, 07:10:15 pm »
Yes I know I was looking for ideas for building one up from bits that can be brought from around the traps.

Offline mick25

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Re: B50MX Ultimate Build
« Reply #3 on: February 16, 2014, 07:18:02 pm »
Send firko and bazza a pm on here they may help , I know bazza is having a break on here firko might be to.
 they may reply to you buy pm ;)
« Last Edit: February 16, 2014, 07:19:58 pm by mick25 »

Offline Tim754

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Re: B50MX Ultimate Build
« Reply #4 on: February 17, 2014, 12:12:01 am »
Seriously do a search of the UK BSA clubs. There used to be one specialty site that had heaps of info with great photos and diagrams of mods for the B50 and B25.
Will post a link if I can find it and it is still there.

Would not even think about changing that gorgeous tank ever.
I may not agree with what you have to say, but I'll defend to the death your right to say it.
                                                   Voltaire.

Offline VMX247

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Re: B50MX Ultimate Build
« Reply #5 on: February 17, 2014, 12:51:57 am »
Big mac
Id be asking forum members geoff,flower pot racing  or HVA61  :)
 cheers
Best is in the West !!

Offline Michael Moore

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Re: B50MX Ultimate Build
« Reply #6 on: February 17, 2014, 05:15:10 am »
http://b50.org/index2.htm

gets you into Rickard's site which is 100% unit single stuff.

I've found that B50s benefit from eliminating as many stock parts as possible.  Ditch the chassis, clutch, transmission, ignition and you start to have a much nicer bike.

 :)

cheers,
Michael

Offline big mac

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Re: B50MX Ultimate Build
« Reply #7 on: February 17, 2014, 07:40:25 am »
Thanks gentlemen gained some useful info from Richard site.

Offline huskibul

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Re: B50MX Ultimate Build
« Reply #8 on: February 17, 2014, 08:06:07 am »
        Hi mac ! the first thing to get is Rupert Ratio's book/manual on unit singles - will give you a great insight on what t hey need ! good luck with the build and keep us all updated  ! luv the unit singles , look and sound great with heaps of character  ;)

Offline Tim754

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Re: B50MX Ultimate Build
« Reply #9 on: February 17, 2014, 11:22:40 am »
That is one I was on about     http://b50.org/index2.htm   ;)
I may not agree with what you have to say, but I'll defend to the death your right to say it.
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Offline firko

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Re: B50MX Ultimate Build
« Reply #10 on: February 17, 2014, 11:29:52 am »
Quote
Send firko and bazza a pm on here they may help , I know bazza is having a break on here firko might be to
Bazza's having a break but I'm just cutting back a wee bit by avoiding anything that looks like a scrutineering or rule thread or any shit fighting. This is what we need more of on the forum.

Anyway.....With the old B50 the KISS principle is the best plan. In stock trim they're a beautiful bike and it'd be a shame to change its appearance so much that it looks like a Cheney or CCM wannabe or worse. Not that those bikes are ugly, far from it. It's just that they have their own particular look so why turn a B50 into something it ain't.
If I had a B50 I'd concentrate most of my chassis effort on the forks and shocks. First up I'd change the 20" front wheel to a 21" Rickman or REH off a Rickman Zundapp or Monty which is both a better brake and lighter. They're pretty cheap on USA eBay and it keeps it all British. The BSA forks aren't that wonderful so fitting cartridge emulators from YSS, Racetech and others is a positive move. Many B50 racers replace the forks with either Betor ( Bultaco, OSSA, Montesa, Rickman and many more) or more expensive but not that different Cerianis. Shocks are pretty much down to whatever you can afford....You can get the best Ohlin, YSS, Reiger and others for $1000 give or take or you can do it on a budget with Works Performance, Progressive and any others for around $500. Of course you can buy second hand quality shocks for beer money and rebuild them yourself (Works are especially amateur rebuilder friendly).

The BSA B50 motor is one of the most durable and hot rodded in the sport....it's the small block Chevy of VMX. There are plenty of sites explaining B50 mods but like Huskibul said, don't even start until you get a copy of Rupert Ratio's BSA singles book. It's brilliant and in simpleton English...even I understand it ;).
'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline VMX247

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Re: B50MX Ultimate Build
« Reply #11 on: February 17, 2014, 12:30:33 pm »
don't even start until you get a copy of Rupert Ratio's BSA singles book.

Readily available ~ too easy  :)
http://www.amazon.com/Rupert-Ratio-Single-Engine-Manual/dp/0953509818
Best is in the West !!

Offline Tim754

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Re: B50MX Ultimate Build
« Reply #12 on: February 17, 2014, 03:03:01 pm »
I may not agree with what you have to say, but I'll defend to the death your right to say it.
                                                   Voltaire.

Offline big mac

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Re: B50MX Ultimate Build
« Reply #13 on: February 17, 2014, 07:46:36 pm »
Thanks for the input I have Ruperts book it will be my guide for the motor. I was wondering about the frame would it benifit from de-raking a few degrees.
Thanks  Rory

Offline firko

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Re: B50MX Ultimate Build
« Reply #14 on: February 17, 2014, 07:50:16 pm »
Quote
I was wondering about the frame would it benifit from de-raking a few degrees
Maybe if you're intending to use it for dirt track but I wouldn't bother otherwise. Perhaps experiment with less offset triple clamps if you're looking for faster steering.
'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha