Basket Cases

Need help finding information or parts for that old machine in your shed? Someone in here will know!

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Pgately
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Re: Basket Cases

Postby Pgately » Tue Jul 28, 2020 8:04 am

I want to purchase or build a BSA Bantam trials bike.
Looking for complete bike or parts.
Prefer D3 Swinging arm Frame, D7 will also work
D7 175 motor
B40 or B20 front end
Fuel tank of that period
Upswept engine pipe

Do you know of any parts or bikes around?



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Kombivan
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Re: Basket Cases

Postby Kombivan » Sun Aug 02, 2020 7:06 pm

JC1 wrote:Nice work Greg.


"Bout time I posted some pics here. Having had my interest in 70's trials bikes rekindled in the last year, I went in search of a ride (or 2 or more). Not sure I found trash or treasure, but its time to 'fess up to some of the 'roachs I unearthed. (Ignore the date on the pics)

First came a 247 Cota I vaguely recalled hearing about probably a decade ago, but had no contact, not even a name. First lead went nowhere, then coincidentally I was talking to another chap 400km away about TYs & he mentioned this guy's name which I instantly recognised. Still listed in whitepages & he still had the cota... "in about a hundred pieces".

Actually it was only about 20 pieces. He'd removed everything from the frame yonks ago to strip & repaint it, but never got around to it. Frame appeared quite rusty but thankfully only surface rust. (Isn't included in pics cos I'd already stripped & primed it).

Amazingly almost everything is in the box. Motor appears to have little wear, except the carb slide. Swingarm pivot tube is seized in bushes & RH frame mount is flogged out - common probs w that model it seems.


1973 very nicely balanced model this one.



David Lahey
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Very old tyre

Postby David Lahey » Mon Aug 03, 2020 7:13 pm

I started rebuilding an old Bultaco front wheel last weekend and noticed that the tyre that was on it is an old Firestone "gum dipped" type. Until then I thought that those old Firestone tyres were made in the USA but it clearly says otherwise. The wheel is late 1960s era and I'm thinking it might even have been the original tyre on it.
Does anyone remember these tyres?
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Bully fanatic
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Re: Basket Cases

Postby Bully fanatic » Mon Aug 03, 2020 8:06 pm

I can remember seeing new Firestone tyres in at the bike shops in the mid 70`s. I`m sure Don Newell had some in the Valley.



David Lahey
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Re: Basket Cases

Postby David Lahey » Mon Aug 03, 2020 8:42 pm

Bully fanatic wrote:I can remember seeing new Firestone tyres in at the bike shops in the mid 70`s. I`m sure Don Newell had some in the Valley.

I can remember that my M99 Alpina came with (worn) Pirelli knobbies on it in 1975. They had a funny name (xxxx-cross?) that I can't recall but do remember that they also came on Spanish MX bikes and the US magazines didn't like them.


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David Lahey
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Re: Basket Cases

Postby David Lahey » Mon Aug 03, 2020 8:45 pm

That rim and two hubs went off to the vapour blaster this afternoon. Photos upon return


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brent j
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Re: Basket Cases

Postby brent j » Mon Aug 03, 2020 9:08 pm

David Lahey wrote:
Bully fanatic wrote:I can remember seeing new Firestone tyres in at the bike shops in the mid 70`s. I`m sure Don Newell had some in the Valley.

I can remember that my M99 Alpina came with (worn) Pirelli knobbies on it in 1975. They had a funny name (xxxx-cross?) that I can't recall but do remember that they also came on Spanish MX bikes and the US magazines didn't like them.


Pirelli "GARA-CROSS" from memory



brent j
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RL 250 oil tank

Postby brent j » Tue Aug 04, 2020 9:49 pm

This is the oil tank set up on my RL. I made a bracket that mounts to an unused boss on the frame and the oil tank slides out to fill it.
It tucks under the seat but interferes with the side cover so I'm not sure what I'll do there
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brent j
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Re: Basket Cases

Postby brent j » Fri Aug 07, 2020 11:06 pm

I had an RDO today so spent the day setting up the rear wheel for my RL250 project.

I knew it was rough but hadn't worried too much up till now. 4 out of 6 studs had been removed and drilled all the way through the hub and had bolts and nuts. The bolts were a mix of 1x10mm metric coarse, 1x3/8" UNF and 2x3/8" Whitworth. On stripping the wheel I found that not only were the other two studs broken but one had been drilled through the side of the stud and the other had a broken of "Easy-out" imbedded in it.

I have another pair of hubs (front and rear) but they are put aside until I get the bike running and buy new spokes.

After a few hours work the broken studs were removed and all the holes squared up, re-drilled fitted with 10mm fine thread bolts cut to length. There are nuts on the inside because there wasn't much choice.

Then there's the sprocket.
I got hold of a new 54 tooth sprocket that is off an unknown bike. The centre hole is about 170mm dia. I used an old Suzuki sprocket with the correct centre holes and machined it down to about 190mm OD and cut a slight lip to suit the larger sprocket centre. I've welded the two together and the overlap has the same effect as the spacer I would usually have to make.
Win some, lose some.

No wonder these jobs take so long................



David Lahey
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Re: Basket Cases

Postby David Lahey » Fri Aug 07, 2020 11:28 pm

Brent you reminded me of some things with your rear sprocket story.
Back in 1974 a school friend had a new RL250 and couldn't get a small enough front sprocket for it so he machined the centre out of a smaller sprocket and the outside off the RL sprocket and stick welded the two together.

In about 2001 I'd just got my KT250 running but the gearing was ridiculously high, I think it was a 15 front (428 chain). Small front sprockets for the KT were difficult to source but I had one on order from Fred Carter in NZ and a trial coming up before it was going to arrive. I had a 13 front sprocket from a TY175 and it had a smaller diameter shaft hole and different width splines but there was the same number of splines, so with hand tools (hacksaw and files) I cut the KT splines and diameter into the Yamaha sprocket. It worked a treat.


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