R&D pipe questions

[Seth_GSX 7]

Just bought a R&D pipe for my GSX 787. This is going to be my first aftermarket pipe install on a Seadoo so many questions about installing this. I've read everything I can find on this pipe and still haven't completely figured it all out. I'm confused on how to route the cooling system. I'm assuming the 1/2" fitting connects the same as stock it's just what to do with the 1/4" hose fittings. Im thinking the 2 fitting that come to a T can be run to the main fuel hose on 160 jets. But what do I do with the stinger fitting. Any info on this pipe is appreciated.

 

[Seth_GSX 7]

Little bigger shot

 

[Matt Braley]

The two 1/4" fittings are fed from the water regulator on top of the waterbox. There is a T between the two 1/4" fittings then one hose going back.

I've set a couple up successfully with these specs I was given...

"75 pilots, 145 mains, 2.0 n/s, 65 gram springs, Mag HS 1, PTO HS 1 1/4, LS adjusters at 1 1/4 -- that is a good starting point for the screw settings-- the jets were spot on for my 97 GSX back in the day-- the gas may have changed some from when I tuned my ski thou. 160 and 160 in the top 2 fittings and a 120 for the stinger jet. I fed the 160's w/ the 1/4 line that came from the WB regulator-- start with the regulator turned all the way in and tune from there"

 

[Seth_GSX 7]

How did you fed water to the stinger fitting. I've got a high comp head, TDR waterbox and flame arresters that I just got the jetting set up for that so I'm gonna see if I can just turn the needles up and see how it runs. I'll adjust jets if needed.

 

[Matt Braley]

You can feed the stinger by putting a 1/2" X 1/2" X 1/4" T in 1/2" hose that the water exits the boat in (rear right). You can also feed it from the water temp sensor hole.

How high compression and what brand head? Dome cc?

I'd start with the needles two turns open each to be on the rich side of things. Have a good tach so you can turn them in 1/8 turn at a time. When you find the peak rpm open the needles up 1/8 to 1/4 turn. Make sure you don't reach a top rpm at WOT and then have rpm falling off, that means your lean.

 

[Seth_GSX 7]

Right now motor mods are pod flame arresters, TDR waterbox and R&D rev head 43cc domes. About 180psi. I'm currently running 147.5 mains, 77.5 low speeds, 2.0 needles and seats, 95 gram spring, High speed mag is 1/4 turn and pto is 1/2 turn. Both low speed adjusters are at 3/4 turns and it's just about perfect. Talked to Chris at watercraft magic and he said they've never messed with a R&D pipe and that I might be able to adjust the needles and be good.