hyperdine 250r cylinder?

[wild250rman]

Is anyone still running the older paul turner hyperdine cylider?

[CorvetteZ06]

I had one of those about 5-6 years ago, and she ran Fantastic!! Unfortunately, when I sold that R, the Hyperdyne cylinder went with it... I'd also be curious to know if anyone is running that cylinder....

[Honda 250r 001]

Ive never heard of these, can someone explain them for me?

[rustyATV]

And while we're at it, who's Paul Tuner and how did Loren Duncan get his stuff?

[ciechna]

I also have a hyperdyne 275cc I wanted to make sure it was in good shape so I sent it off to duncan. He called me two months later and said these cylinders were not impregnated when they were casted and have a hard time holding pressure during a leak down test. He gave me a quote of something like 700 bucks to get her going again.

[wild250rman]

Originally posted by ciechna
I also have a hyperdyne 275cc I wanted to make sure it was in good shape so I sent it off to duncan. He called me two months later and said these cylinders were not impregnated when they were casted and have a hard time holding pressure during a leak down test. He gave me a quote of something like 700 bucks to get her going again.
let us know how it turns out!

[machwon]

I had one of the first nikisil plated ones back in 95. The very first ones were cast iron sleeves, after that plated aluminum. They came in 3 or 4 port exhaust. Mine cracked around the intake and transfer port. This created an air leak that was very hard to detect. This was the first R motor I had that could kick a cr 250's arse.