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p1-250

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p1-250

Postby aly393 » Mon Sep 03, 2012 5:12 pm

with a old 2-stoke 250 motor, and a little work, maybe the p1-250 grid will grow next year :mrgreen:
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Re: p1-250

Postby jeremy » Mon Sep 03, 2012 7:44 pm

PM sent. By the way, it's a P2 chassis :-(
Yamaha two-stroke twins forum --- http://yamahatwostroketwins.prophpbb.com
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Re: p1-250

Postby aly393 » Mon Sep 03, 2012 8:53 pm

actually P1 :D
the frame is in fact a Yamaha factory race RD-56 , stamped on the frame ( verified by Denis C. )
they where made from 1963-66
Phil Read won the 1964 250cc world Championship on one, and our very own
Michelle Duff was his teammate, who finished 3rd!
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Re: p1-250

Postby adornell » Mon Sep 03, 2012 9:21 pm

And where would a guy come across such a find. Fantastic.
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Re: p1-250

Postby aly393 » Tue Sep 04, 2012 6:56 am

little ole ladies basement :mrgreen:
p.s big thanks to Jim and Herb.B
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Re: p1-250

Postby Peter Balfour » Tue Sep 04, 2012 8:12 am

Very cool, that bike needs to be on the grid for 2013!
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Re: p1-250

Postby pz1morton » Tue Sep 04, 2012 4:16 pm

Allan
Very nice find indeed..lookinf forward to seeing it on the grid Allan...You try and get a hold of Brad Boomer on our site as Autofobe Allan he might have an old two stroker laying around...again you have the starts of something very nice..

Regards Paul
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89 FZR600 P4F2 / Endurance Bike
VRRA # 757
RACE # 757

Remember this we pay to play not get payed to play
Besides it's my story and i'm stickin to it c
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P1-350

Postby aly393 » Wed Sep 12, 2012 6:16 pm

after a weeks crash course on Yamaha racing history, and talking with a ton of people, I knew I had to build something special. the original RD-56, housed a 250 rotary valve 2-stroke, and trying to build something similar I thought I would opt for a Kawasaki samurai 250 rotary valve. Period correct.makes some sence :? then Brad said something to me about a special that was built in 1967, the Z608.
36560569.gif

In 1967 yamaha built 6 prototype bikes to race in the Daytona 200, the bike used a rd-56 frame reworked to house a production YR-1 350 motor. well then, thats what I want to replicate.the new project is a P1-350 . lots of work to go , but the motor just slotted in like it was made for it :D
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Re: p1-250

Postby pacomotorstuff » Wed Sep 12, 2012 8:46 pm

Hi Alan,
Love your RD56 roller and the YR-1 engine is great (I've owned a YR-1 for 43 years).
I began something similar a number or years ago - but ersatz, stuff built to resemble the Z608, not the real thing like yours, sold a lot of the bits off ages ago.
The only thing you might have trouble with re: period-correct tech, is the swing arm. I checked my Z608 files, went on line and checked a few of the photos posted there of the Z608 and the RD56 and didn't see any rectangular-section swingarms in 1967 (maybe '68 - I didn't check). I had already purchased a box swingarm for it but the tech decision was something like "not a chance", so I went back to a YR-1 swingarm, which I think is a little longer than the RD56 swinger but might not fit in a "real" frame. The other biggy was "no TR2 engine parts" and I sent and received some spirited emails about using the 1969 YR-3 cylinders (YR-1, YR-2 and YR-3 were all basically the same motor but the '69 barrels were true 5 port cylinders).
Coolest project bike I've seen in some time.
Good luck on the build. I'll be watching this 'un.
Regards,
Pat Cowan,
Vintage Motorcycle Fiberglass
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