RIVA stage II? pipe -- need to know coupler & o-ring sizes

hevnsnt1

hevnsnt1

X
Location
Indiana, PA
I have a Riva stage II wetpipe (I think it was stage II), anyway, it was the first generation of Riva's stamped aluminum pipes, like the one pictured below. I need to get a coupler & o-rings for it, but can't find any info on what sizes. My local Yamaha dealer (Ottis) called Riva a few months back & the guys he talked to had no idea. Anybody know?
 

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hevnsnt1

hevnsnt1

X
Location
Indiana, PA
Pipe is still on my ski out in my freezing, unheated garage. Didn't want to mess with it until I have the parts. Figured someone with the same pipe might know the sizes.
 
SJ Thumpa

SJ Thumpa

SJ THUMPA
I think I've got a spare o/ring hiding at home (mine had none/perished) If I find it I'll measure it. From memory they take 2.
 
hevnsnt1

hevnsnt1

X
Location
Indiana, PA
Finally had a decent day to take the pipe off. The coupler is 3.5" ID x 2 3/16" LG. The o-rings are 2.5" ID 3/16" THK Buna 333, not sure of the durometer rating, but I ordered the 90 rating. Both can be ordered through Mcmaster Carr. FYI
 
Q

QuickMick

Guest
hevnsnt1 said:
Finally had a decent day to take the pipe off. The coupler is 3.5" ID x 2 3/16" LG. The o-rings are 2.5" ID 3/16" THK Buna 333, not sure of the durometer rating, but I ordered the 90 rating. Both can be ordered through Mcmaster Carr. FYI
Click to expand...

Hevnsnt1 is correct on the size of the coupler. I just have a bunch of O rings but the size he states looks like it should fit.

If your going to use this pipe, go to wwwjetskisolutions.com and look at his pipe installation tip. pack that thing full of high temp silicone before you slide the pipe on the manifold. It makes the coupler last 3-4 times as long.
 
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