Any R5 pistons out there?

Help! Does anyone have any new or used Yamaha R5 350cc pistons for sale, I would consider any size. Is there any retrofit from any other engines?

Thanks, Stan

 

pro-flow had wiseco do a run them a while back, not sure if they still have them though.

 

Also Rick Merhar had some R5 Wisecos at one time. Not sure if he sold them all.

 

Stan,
I have a few R5 pistons for sale.They are the later ones that use the RD ring.
What kind of project are you up to now?
Email me at [email protected]
Tom

 

sounds like a V2 project!!!!!!!!

 

Thanks for the replies, guys, I didn't think there were any pistons left at all. As it turns out, a local racer only 20 min. away has NOS pistons at a smokin' price (dykes ring type, of which I have some). Another source that came up is Speed & Sport (570) 784-6831, they say they have all sizes of pistons and rings NOS in stock! $73.44/piston, $52.35/rings. Not bad.

No comment on the aplication

Stan

 

Confucius say, "Man who messes with dyke's ring may end up with damaged piston!"

 

Sounds like secret shit.Anybody else have any secret stuff we should know about before next year?

 

I'm only anticipating an engine output around 35HP with a redline of 9K or so. Definatly not TR3 specs. What does Confucius say to that?

 

I was just clowning. Only troubles I've heard of were when high rpm's and wide exhaust ports were brought into the picture. Don't know your plans, but 35 rwhp could be achieved with pipes and no porting, so I don't see a problem.

 

Whew,



I thought I would be OKay, but you had me worried there was something I didn't know about.

 

I had a problem with the Dykes ring style RD pistons, had a set in the 400 for 2/3rds of this year. (they came with the cylinders and the bore was set properly so I figured why waste them).

I felt the motor tighten up at Kershaw in practice and pulled over..

here is my thoughts on it..

The ring pin had been pushed in allowing the ring to rotate. Because of the way the dykes ring is relieved for the pin on the horizontal plane and the pin is centered in the groove only the vertical section of the ring comes in contact with the end of the pin.

The constant hammering on the pin drove it into the piston, the ring was then free to rotate. I caught the slowdown before the ring totally snagged and broke. It caused some port edge damage and a light seizure.. (required a 2 size increase in the bore to clean up the cylinder)

If I was going to run a Dykes ring piston again I would keep a close watch on the pin with regular inspections..

I know some people have converted their R5 cylinders to run a snowmobile piston, I think it required some light machining of the base gasket surface…

as far as 35 HP@9000, that would be an mild state of tune... I ran some BMEP numbers on it if your interested drop me a note...

 

I always try to keep in mind that there IS something I didn't know about. Always.