1950? 500cc BSA project

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harry76

harry76

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Apr 16, 2011
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Im planning on replacing the carb with the one Ibedayank said to.... Amal 276 if i rmember correctly.

I rode and raced motorcross for around ten years then have ridden all forms of mountainbiking including downhill since then, i understand the purpose of front and rear tyres and i honestly dont see a problem with running that tyre on the rear. And im pretty sure its been done before. Its a common practice on bigger sized board track replica builds
 
harry76

harry76

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Apr 16, 2011
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As ive said, and i hope not to be rude, but it seems i keep having to say this. This bike WONT be registered, it will most likely rarely be ridden, and most definitely WONT be ridden in the rain. And if it causes a problem i can remove the tyre and install a 21" road style tyre.... no biggie. I just want a cool looking vintage bike with as fewshortcuts as possible. Proper road tyres would annoy me on this bike, as it is the 21" will annoy me but i can live with that.

If i wanted a fast, good handling bike in the dry or wet id buy a freaking Hayabusa but im not in least bit interested. Each to their own but thats what im into. I like old bikes, the older the better and ive always wanted a boardtracker so im gonna try biulding one.

Funny thing is i know a lot of you may see this as crazy and think i should build something for the road, but thats not my thing. People think im crazy for building a boardtracker that cant be registered for hopefully less then a couple grand...... but no-one says anything when someone forks out close to $10,000 for one of those Timeless bikes that also cant be registered.
 
rustycase

rustycase

Gutter Rider
May 26, 2011
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Gosh Harry, I gotta stop joshing u thru the keyboard!
I know U know abt motorbikes and such...

Still, just because you see some Swede with something doesn't mean it's the best way to go, or even a good idea...

Even the major manufacturers put out some awful, horrible ideas, that just did NOT work out.

IMO, the Yank is batting 1000.
He really knows his stuff.
Far more than I ever will!

Best
rc
 
harry76

harry76

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Apr 16, 2011
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OK sounds fair enough.... heres where im at then. Im not interested in putting a huge box behind this motor because it would just look silly on an early design boardtracker. Agreed?

So if Ibedayank is batting 1000 he might be able to answer me this.... do you think id be able to do a direct belt drive?

A. Would i be able to get the right reduction to get moving (geared low enough)?
B. Would i even be able to start it?
C. And would a big belt drive handle the power? Something like on the Timeless bikes (i do realise they are only a few HP)

Remember im not interested in going 100mph, somewhere around 35-50mph would be more then enough to keep me happy and i doubt id ever feel the need to even go that fast
 
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harry76

harry76

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Apr 16, 2011
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Brisbane, Australia
I apologise if i seem like im not listening to your advice, i am. Its just i want to make sure. Im sure you can understand.... as i said previously i had a couple people on my Villiers build saying the angle of my handclutch wouldnt work as is..... I knew it would work and has performed perfectly ever since.

But this build is a little beyond my current abilities, so i apologise for all the questions and i DO appreciate your input. Just dont wanna change my initial vision to later find out it would have worked just fine.
 
harry76

harry76

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Apr 16, 2011
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Ibedayank said:
rusty what he has on the motor now is nothing more then a fixed metering block for a fixed speed
Click to expand...
Im not sure about that, i had a feeling it had a butterfly valve, so i pulled it off the motor to check, sure enough it does.... Does this mean it would be usable because IMO this carb looks very cool and seems to be made of a copper/brass or similar material that would probably polish up very nicely





Because im admittedly a novice when it comes to engines im not sure what this spring thingy/valve does. When compressed it opens up inside (below the spring), i took a pic but not sure how well you can see it. Anyone know its purpose? And how that is actuated? Vacuum pressure perhaps? Any advice would be appreciated





 
harry76

harry76

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Apr 16, 2011
2,557
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Brisbane, Australia
truckd said:
GEEEs!!! Harry
just put a Schwinn ten spd hook up on it!!!! LOL
Click to expand...
Thanks Truckd, ill keep that in mind :)....... wiseguy LOL

and maybe i should run700cc wheels/tyres as they are large diameter

***Double post.... why cant we delete posts?*****
 
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truckd

truckd

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Oct 19, 2010
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palmdale calif
Gotta keep you Aussie's in check, Ha!Ha! I'm sure what ever you do will work out just fine ,you ain't no noob at this and a board tracker is a must, just make a bad ass tracker, don't get wacky on the 700c's run 28"s
 
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harry76

harry76

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Apr 16, 2011
2,557
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Brisbane, Australia
Thanks for the kind words Truckd but when it comes to engines i am a newb, thats why we are up to page 26 and im yet to turn a wrench. But im willing to learn if you guys have the patience LOL..... if you guys lived locally id offer you a ride if and when i get this going.
 
MEASURE TWICE

MEASURE TWICE

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Jul 13, 2010
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I don't know about the gear box stuff, but I though when you mentioned about the use of belt maybe not being stong enough, maybe go twin belts. They make pulley twin, I've seen them on Graingers web site.

Somewhere I may have also seen this on an old time bike, but maybe I'm wrong there?

MT
 
harry76

harry76

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Apr 16, 2011
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Wouldn't that mean twin sheaves? That would be tricky wouldn't it? And would 2 thinner belts be even stronger then 1 wider one? I wouldn't think so?

We have a LOT of big machinery at work, some of thm use the same style belts as found on superchargers, they have small teeth. I guess I could use something similar but then still have the problem of finding/making a toothed sheave.
 
MEASURE TWICE

MEASURE TWICE

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Jul 13, 2010
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True, maybe it was just on machinery as it would be like redunancy and when one breaks in critical area, the machine keeps running till a good stopping time to repair.

Though an idea comes to mind, a jack shaft and a belt on each side of the rim.

OK, maybe not to use two belts even if not complex, as not what a BTR is as far as looks were back then?

MT
 
harry76

harry76

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Apr 16, 2011
2,557
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Brisbane, Australia
RickS said:
Why all the worry about a belt drive? This bike has gone 55 mph on 5 hp with a single BX belt.
Click to expand...
Some members pointed out that my engine might be too powerful for a belt drive, I raised the point of Harley's going back to using them. But like they said they are the toothed variety.

I'm just trying to make sure before I start wasting money into this project.
 
harry76

harry76

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Apr 16, 2011
2,557
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Brisbane, Australia
Is that your bike RickS? She's a beauty, is there a build thread for it. I'm at work on my phone ATM but keen to have a better look when I get home
 
R

RickS

Member
Jan 30, 2011
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Speonk, NY
No, not mine. It belongs to a gentleman from georgia. No build pics, sorry.
I have several other simplex's, they are stock and run about 45 mph through the same belt drive.
 

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