Basket Cases

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

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David Lahey
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Re: Basket Cases

Postby David Lahey » Fri Mar 01, 2019 9:44 pm

Bully fanatic wrote:So David, can I enter my Sherpa in this clutch pull competition? There is a big difference between those two levers. I know which one I`d prefer. That`s why I still stick with the Amals on all of my :Bultaco: s. Much better leverage.

AMAL levers are certainly a wonderful example of industrial art. I went and took these photos tonight and as I looked around deciding which AMAL to take a photo of, realised that all my Spanish bikes have AMAL levers, which is just how I like it. I reckon Spanish bikes look strange with something else and other bikes look strange with AMAL levers.
As well as looking strange on a :kawasaki KT, the AMALs hole spacing at 23mm is certainly better than Japanese levers at 25mm, but still doesn't match the 20mm of the Ballard's levers.
The bottom photo shows a Ballard's lever and a recently-manufactured genuine AMAL lever, soon to go on a Bultaco M85 Alpina 8)
The upper photo is a 1970s AMAL lever on a M138 Alpina
As for the clutch pull competition Bullylover, yes I think it would be highly interesting for you to take part in the clutch pull competition
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David Lahey
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TY spokes

Postby David Lahey » Sat Mar 23, 2019 10:57 am

Just making it known that you can still buy new genuine spoke kits for TY175 and TY250 front and rear from Yamaha dealers. Here are some I picked up during the week from Gladstone Motorcycles. They weren't in stock in Australia so they took a while to get here from Japan but they are exactly what I wanted.
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David Lahey
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rear rims

Postby David Lahey » Mon Apr 08, 2019 3:11 pm

I have been working on some trials bike wheels lately and decided to see how much variation there was in the weights of a few rear trials bike wheel rims.
Greg Harding has extolled the virtues of the :yamaha TY250A rear rims previously in that it is quite a wide section which suits the fitment of modern tubeless rear tyres without any special treatment.
Here are the weights I got today.
All of these are 18" trials bike rims.
:yamaha TY250A 2100g DID
:yamaha TY250D 1670g Takasago (Japanese copy of shoulderless AKRONT)
:kawasaki KT250 1900g DID
:Bultaco: M80 Sherpa T 1650g AKRONT mud catcher
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Greg Harding
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Re: rear rims

Postby Greg Harding » Mon Apr 08, 2019 7:07 pm

Hi Everyone,
David Lahey wrote:Greg Harding has extolled the virtues of the :yamaha TY250A rear rims previously in that it is quite a wide section which suits the fitment of modern tubeless rear tyres without any special treatment.
Here are the weights I got today.
All of these are 18" trials bike rims.
:yamaha TY250A 2100g DID
:yamaha TY250D 1670g Takasago (Japanese copy of shoulderless AKRONT)
:kawasaki KT250 1900g DID
:Bultaco: M80 Sherpa T 1650g AKRONT mud catcher

David, :yamaha TY 250A is a 2.15 wide rim and all of the other TY 250 Twinshock rims are 1.85 wide and I think they are the same as all of the TY 175 rims.
The only other one that I have without the heavy bit in the middle is:
:suzuki RL 250 2.15 wide rim at 2200g:
1554712921164.jpg
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Has anyone else got any for a comparison?

While we are going, maybe we should weigh the heavy bits in the middle and something tells me that the :Bultaco: M80 is going to be somewhat of an anachronism?


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David Lahey
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Re: rear rims

Postby David Lahey » Mon Apr 08, 2019 7:37 pm

Greg Harding wrote:Hi Everyone,
David Lahey wrote:Greg Harding has extolled the virtues of the :yamaha TY250A rear rims previously in that it is quite a wide section which suits the fitment of modern tubeless rear tyres without any special treatment.
Here are the weights I got today.
All of these are 18" trials bike rims.
:yamaha TY250A 2100g DID
:yamaha TY250D 1670g Takasago (Japanese copy of shoulderless AKRONT)
:kawasaki KT250 1900g DID
:Bultaco: M80 Sherpa T 1650g AKRONT mud catcher

David, :yamaha TY 250A is a 2.15 wide rim and all of the other TY 250 Twinshock rims are 1.85 wide and I think they are the same as all of the TY 175 rims.
The only other one that I have without the heavy bit in the middle is:
:suzuki RL 250 2.15 wide rim at 2200g:
1554712921164.jpg

Has anyone else got any for a comparison?


Yes you are spot on Greg about the heavy bit in the middle of the TY250A rim. Lucky it's there though or there would be nothing to attach the spokes to. I also weighed a 2.15 wide "yellow sticker" AKRONT shoulderless rear rim (which is something you might find on a 1975 :Bultaco: Alpina or Pursang) and it was pretty much the same weight as the TY250A 2.15 rim (no surprises there)

One thing I'm fairly confident of is that there would be at least 1 kg difference in weight between a post-1973 :Bultaco: Sherpa T complete rear wheel and a :kawasaki KT250 complete rear wheel. A fun comparison for a later date when I can reach my M198 back wheel


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David Lahey
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Re: rear rims

Postby David Lahey » Mon Apr 08, 2019 7:40 pm

Greg Harding wrote:Hi Everyone,
While we are going, maybe we should weigh the heavy bits in the middle and something tells me that the :Bultaco: M80 is going to be somewhat of an anachronism?

Yes, I suspect that the :Bultaco: M80 rear wheel hub well and truly compensates for all the lightness built into the rim


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David Lahey
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Hub weights

Postby David Lahey » Mon Apr 15, 2019 6:13 pm

Well I finally despoked a :kawasaki KT250 rear wheel today so weighed the :kawasaki KT hub and a :yamaha TY rear wheel hub.
I weighed them assembled with axle, brake plate and shoes and also weighed them just with bearings and bearing spacer.
Whole enchilada:
:kawasaki KT250 4160g
:yamaha TY250 3380g
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Just the hub bearings and spacer:
:kawasaki KT250 2610g
:yamaha TY250 2130g
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Greg Harding
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BIG Bultaco BANANA Wheels

Postby Greg Harding » Wed May 01, 2019 8:39 pm

Hi Everyone,
David Lahey wrote:One thing I'm fairly confident of is that there would be at least 1 kg difference in weight between a post-1973 :Bultaco: Sherpa T complete rear wheel and a :kawasaki KT250 complete rear wheel. A fun comparison for a later date when I can reach my M198 back wheel

David, here is a :Bultaco: M49 rear wheel assembly, I think the same as M80 :
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And here is a :Bultaco: M198 rear wheel assembly at about 2/3rd the weight:
1556514385632.jpg
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Today is the Inaugural National Banana Day so Peel Good, Feel Good!

Is it just me or do the offset hub/unbalanced :Bultaco: wheels look like they are Banana shape?
1556513994582.jpg
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Or have I just looked at TOO many Bananas :?:


2017 Newsflash: RUST IS THE NEW BLING !
Team Hardwood, the only licenced trials riders in Coffs Harbour!
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Re: Hub weights

Postby Greg Harding » Fri May 17, 2019 6:58 pm

Hi Everyone,
David Lahey wrote:Well I finally despoked a :kawasaki KT250 rear wheel today so weighed the :kawasaki KT hub and a :yamaha TY rear wheel hub.
I weighed them assembled with axle, brake plate and shoes and also weighed them just with bearings and bearing spacer.
Whole enchilada:
:kawasaki KT250 4160g
:yamaha TY250 3380g

:Honda: TL 125 3500g
1558082592978.jpg
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Anyone else got anything exotic like maybe :suzuki :?:


2017 Newsflash: RUST IS THE NEW BLING !
Team Hardwood, the only licenced trials riders in Coffs Harbour!
Miles of Smiles
Greg Harding

Twinshock200
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My latest resto.

Postby Twinshock200 » Tue Jun 11, 2019 4:50 pm

Here's a few pics of my latest restoration. This one isn't as fancy as my previous but it has had a total resto from top to bottom, new tyres, stainless spokes, new brakes, nice paint job, refurbished exhaust.
After I sold my last effort this one is definitely a keeper,( but everything has its price !!) with a new exhaust system on the way.
Before and after pics attached.
Yes the bash plate is finally fitted
Galps
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