86.5mm Pistons?

[SkiDaddy]

I've searched & found references to these but no info on where to get them. Anyone know?:sneaky: I'd prefer ligtweight forged pistons but Wiseco will only do a minimum run of 6, with setup charges.:frown:

 

[crammit442]

Riva has them listed on their website. They are flat tops, though.

Charles

 

[#ZERO]

Are you looking for dome pistons or flat tops?

What head are you using with these pistons?

 

[GDFL]

why do you need pistons already? I thought you were on your last bore

 

[Rickster]

What kind of sleves you running? Most big bores only go out to 86mm safely.

 

[SkiDaddy]

I bought a "very" used Wamilton's big bore, it was already at 86mm, and at the service limit on looseness already. When I replaced the head o-rings the pistons seemed pretty loose.

BTW I knew it was 86mm, but not that loose. I did get a fair price for it though.

It's a Greater Yamaha girdled head currently running Pro-X domed pistons. Yeah, I might be able to run Wisecos w/just a hone job. I don't know how the flat top RIVA's would work with the porting. I'd need new, smaller domes for sure.

Don't know if it'll go 86.5, the sleeve does look thin. There is epoxy poured into the bottom of the water jacket to strengthen the cylinder.

 

[Idok]

thats a big drill bit!

 

[SkiDaddy]

That's hole saw territory there!:biggrin:

 

[sjetrider]

I've searched & found references to these but no info on where to get them. Anyone know?:sneaky: I'd prefer ligtweight forged pistons but Wiseco will only do a minimum run of 6, with setup charges.:frown:

RIVA R&D's made by Weisco are the only I know of in that size for SJ

 

[LIVE2RIDE Powersports]

RIVA R&D's made by Weisco are the only I know of in that size for SJ

I am ordering a set of sleeves from Northwest sleeves. They said they sell a sleeve for the 86.5. I did some research and at a stock stroke thats 799cc?

Is this setup recomended of should i go with the 790cc?

 

[Rickster]

I am ordering a set of sleeves from Northwest sleeves. They said they sell a sleeve for the 86.5. I did some research and at a stock stroke thats 799cc?

Is this setup recomended of should i go with the 790cc?

Check with Riva first, I heard they were not going to carry the 86.5 pistons anymore after they sell out what they have in stock...

:thinking:

 

[Polish jet pilot]

R&D had them too - built by wiseco...

 

[Scraggly]

http://www.rd-performance.com/newProducts/yamaha/08superjet.asp

 

[jeckert]

I might be able to help if you need these pistons...PM me for details.

 

[LIVE2RIDE Powersports]

http://www.rd-performance.com/newProducts/yamaha/08superjet.asp

R&D stopped selling the pistons and sleeves. Just got off the phone with them.

 

[Rickster]

I got two of the last three that Riva had in stock, so hopefully they do another run of them.

 

[jeckert]

Doubt it!...let me know if you need something.

 

[#ZERO]

I got two of the last three that Riva had in stock, so hopefully they do another run of them.

I'll trade you two brand new Riva 85mm flat tops for two 86.5mm Riva flat tops if you're interested.

They're still in the box with complete with rings, clips and bearings.

 

[Rickster]

I'll trade you two brand new Riva 85mm flat tops for two 86.5mm Riva flat tops if you're interested.

They're still in the box with complete with rings, clips and bearings.

Sorry, but the pistons are already in my motor.