760 Riva Red Pipe Jetting

[BostonSJ]

I have been searching for a few days and have not had any luck so hopefully someone can shed some light.

I am rebuilding my couch XL760. I randomly found a Riva Red Pipe made for that ski on eBay. I had never seen one before and because I can’t leave well enough alone I bought it.

There is so little information out there and I can’t find anything about jetting. I guess it would be the same as any other 760 Red Pipe? The motor is 100% stock. What should I do for jets, n/s, spring, screws? Thanks!

 

[BostonSJ]

Anyone?

What about other pipes? Everything I am reading shows going down in jet size from stock. I can't wrap my head around that one. Any insight?

 

[MTRHEAD]

Assuming you do NOT change anything but the pipe. I would stick with stock jetting and mess with scews to get a good baseline.
130/132.5 highs and 115 lows.

if you add or change flame arrestors you have to change the pop-off.

 

[BostonSJ]

Correct keeping everything else stock including flame arrestors.

Stock jets in the XL760 are 137.5/135 Mains with 115 Pilots. So for factory pipe as an example they say 130/132.5 mains with 115 pilots.

Just confused by the whole thing...

 

[MTRHEAD]

Ok keep yours - the GP760 is 130/132.5

 

[BostonSJ]

Ha ok.

I wonder why the XL is so much larger. Seems like just adjust screws and go from there then?

 

[MTRHEAD]

Singers (end of pipe) are on the smaller side on Red Pipes....that's why they work so good up top. Don't over prop or you will be sorry. A FPP b-pipe is much more forgiving than a stock riva redpipe when starting to modify the engine or loading it harder.

Riva superjet redpipes have the same size stinger as a dry pipe. Way smaller than the B-pipe.

 

[BostonSJ]

Got ya. This is going in my couch so 90% of the time its full throttle. Agree the FP is nice but these rear exit pipes made for the XL's are so rare so I picked up the first one I saw which was this red pipe.

was going to go with whatever impros recommends for the pipe.

 

[Half flip95]

what he said

 

[BostonSJ]

Thanks guys.

I talked to Pro-Tec figuring their pipe is similar and they just up the smaller main to 137.5 to match and adjust the screws to 1.5 turns low, 2 turns high.

Figure I will start there and adjust accordingly.