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Twinshock Trials / Disc Brakes And Other Mods


scrumpyjack
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Here is one bike that defies the twinshock catagory - Mick Andrews 1973 Yamaha TY250 OW10, its a monoshock! A Rare bike indeed, and not likely to turn up at any ride soon.

Similarly soul searching is the issue about whether to allow the Yamaha MX400B in Post-Classic motocross events. Here in OZ, Post Classic MX is for pre-75 bikes and the MX400B came out in late 1974 so should be eligible, but like the OW10, is also a (cantilever) monoshock bike.

I reckon that if we were lucky enough for someone to turn up on the OW10 at a Twinshock trials event, we should welcome them with open arms to have such an interesting bike to watch.

The more competition oriented riders can be assured that such a bike would not provide any technical advantage over late model Twinshock trials bikes. There are good reasons why trials bike design did not follow along the lines of the OW10.

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Hi subanator, uprating those skinny forks on your ty175 is a good place to start..!

I have some TY yolks that have been machined out to take 35mm marzochi forks,

and i have a mint set of forks to go with them,... and of course front wheel, with disc

and even the master cylinder .. all just ready to slot into your bike.

Then i would get the barrel ported a little... I have a ty175 and it goes great,, even pulling

my big frame up most obstacles... it has shocked a few people.

Scrumpy

How long are your forks and what are they originally from - mighgt work great on my honda!

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Hi subanator, uprating those skinny forks on your ty175 is a good place to start..!

I have some TY yolks that have been machined out to take 35mm marzochi forks,

and i have a mint set of forks to go with them,... and of course front wheel, with disc

and even the master cylinder .. all just ready to slot into your bike.

Then i would get the barrel ported a little... I have a ty175 and it goes great,, even pulling

my big frame up most obstacles... it has shocked a few people.

Scrumpy

Thanks anyway Scrumpy Jack, I am on the otherside of the world, so no advantage to me!

Yes what are they off and are they leading axel? I see pics around of Pinky 250 front ends on earlier TY's, but this would tend to slow the steering/lenghten the trail etc.

Interesting thought, but no to disc brake.

I have the appropiate JS specs to upspec the motor, just need another barrel to modify, and keep an original setup too.

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