rossier pipe water line routing????

[All Seas]

Hey All,

I am still getting to know my "new to me" XP and since it's modded and I am a new XP owner, i naturally have some questions on how things should be done.

My boat it setup with a rossier pipe and tar waterbox. From what I can see, the inlet comes off the pump, to a Tee. The T side goes to a jetworks flow control valve then to the stinger. The other side goes to another Tee with a smaller line going to the water box with a nozzle/barb (no regulator). The other line of the second T goes to the head, then from the head to the pipe.
So Flow looks like this:
Pump
Tee----->Jetworks Valve ------>Stinger
Tee-----> smaller line to barb on waterbox
Head
Mid Pipe


Next, the head pipe has 2 ports on it. One that has a line going to the left rear pee hole, and the other that has a barb on it that looks to be capped?????? Does this sound right? Am I missing something?

Max rams seem to be in the 6800 range

Pic Attached:

 

[Sportster-2001-951C-Stock]

I've never seen one but...
The barb on the top plugged with a yellow tygon tube is water jacket vent for air to escape so the pipe can fill completely, no trapped air pocket in the jacket?

 

[Matt Braley]

The capped fitting is for water injection but you don't have it or need it necessarily. It looks like your larger lines have been swapped on the back of the head. The incoming water should be on the lower left fitting(same side that feeds the pipe). Also the fitting to waterbox needs to be tapped 5mm and have a 140 High Speed Mikuni jet screwed in it. Your loosing a lot of water pressure there and the pipe needs it to work right. The stinger needs a jet also, it should be threaded already.

 

[All Seas]

will the larger head lines being swapped cause any problems or should I switch them back? This is how I got it.

Also, would I need water injection with the regulator removed? Sorry if these are basic questions. This is all new to me.

I will check the jet sizes on the the water box and stinger tomorrow and report back.

 

[Matt Braley]

Yes it should have the lines swapped so the incoming water from the pump goes to the lower rear fitting on the head. You don't need water injection with the Rossier. It's needed on some aftermarket pipes to cure a flat spot in the lower rpm range, nothing to do with cooling.

No problem they are not basic questions at all. Around the turn of the century Rossier started to concentrate on ATV products and it's hard to get the old PWC performance info these days.

 

[All Seas]

Thanks Matt,

I have been trying to figure out why I am only getting 6700-6800 RPMs with this setup and was thinking it may be exhaust related.

Would I benefit at all by changing any of this or adding Water injection?

 

[All Seas]

Is it possible that it's setup with reverse cooling? Heard a little about it but no experience with it.

 

[Matt Braley]

It's possible they did it on purpose but there is no good reason for it. Is the waterbox fitting unrestricted? You need that jet in there. Have you looked underneath the 1/2" fitting on the pipe to see what size jet is there?

Also you should check where they have the Jetworks flow valve set at. You can back the ski in the water with the plug in but the rear strap still on. Make sure you don't back too far obviously but you don't want it too shallow or you can suck debris into the pump. Mount the ski with the seat off and pull the hose to the stinger after the flow valve. You want it to not flow at idle and start flow about 3000rpm.

 

[All Seas]

Matt,

How many jets/hoses do I need to check total? I will start messing with it tomorrow and want to be sure. So far I am checking out:
hose/jet on stinger with jetworks valve setting
hose/jet on water box
swap intake hoses on head


is that it? the only other hose I see is the line off the head going to the pipe and the pee hole line coming off the top of the pipe out the side. I guess that capped water injection line is ok?

 

[Matt Braley]

On the line that goes from the head to the pipe, pull it on the pipe side and remove that fitting on the pipe. There is a jet underneath that. Make sure it's not clogged and see if you can read the size.

I notice a filter on the way to the waterbox. They may have screwed a jet into that instead of the fitting on the wb.

 

[All Seas]

Thanks Matt. I will work on this and report back. In the meantime, I threw this together to show my current setup:

 

[Matt Braley]

Yeah I saw that on another forum, pretty slick.

 

[modblaster]

Thanks Matt,

I have been trying to figure out why I am only getting 6700-6800 RPMs with this setup and was thinking it may be exhaust related.

Would I benefit at all by changing any of this or adding Water injection?

This pipe will work to 7100@ 7250 rpm!no 6700rpm
Put 90 main into the elblow rossier..
What is your impellor you run? Skat trak swirl or solas concord ?

 

[All Seas]

Ok so i finally got to see what jets are in there. Looks like a 135 to the water box, 110 to the mid pipe off the head and nothing in the stinger, just the jetworks valve.

 

[modblaster]

Put 140 or 150 to stinger...90 or 100 main jet to mid pipe
Ecwi to head pipe..use the spray nozzle!!
Block water to waterbox...rossier recommand blocked the water to waterbox...

Use solas 15/23 concord or skat trak 17/22 swirl
You need than motor up to 7100 rpm and more...

 

[All Seas]

man I have been reading so many different setups...how do you know which is the right one?

The rest of my build that I know of has novi 44mm carbs, r&d intake manifold, flame arrestors and a tdr water box

There is a port on the head pipe for ecwi but I don't have any parts that go with it.

 

[Matt Braley]

You are as close as a jet in the stinger and swapping your water lines. If you want a EWCI setup I can sell you one and explain how to install. It won't hurt performance, but it will cost and complicate. First I recommend that you continue dialing in what you have and see how you like it. I have set up 2 different X4's with Rossier pipes and they are fast reliable boats, neither has water injection.

 

[All Seas]

So do I block off the water box like mod blaster said or keep the 135 in there?

What size jet in the stinger for my setup?

 

[Matt Braley]

It does not take performance away to keep it in. It's insurance against the stinger jet clogging and exhaust hoses burning up.

I'd use a 120-130 in the stinger

 

[All Seas]

ok so I cleaned out the main jet and reinstalled it. Also swapped the water lines as instructed.

I am a little confused with the stinger jetting. I looked in the port and do not see any threads to install a jet. It's actually a decent size hole. Is there an "in line" adapter I can use to splice into the hose going to the stinger?

Also, just curious why there is so much variance on stinger jets. You say 130, the other poster said 150 and I read on another forum to run 170.

Will the jet size affect performance at all?

 

[modblaster]

The stinger jet size no affect performance.....only the mid pipe ...
Go with 130...anyway...just for keep cold your hose rubber

 

[Matt Braley]

ok so I cleaned out the main jet and reinstalled it. Also swapped the water lines as instructed.

I am a little confused with the stinger jetting. I looked in the port and do not see any threads to install a jet. It's actually a decent size hole. Is there an "in line" adapter I can use to splice into the hose going to the stinger?

Also, just curious why there is so much variance on stinger jets. You say 130, the other poster said 150 and I read on another forum to run 170.

Will the jet size affect performance at all?

The hole in the stinger is prepped for tapping and screwing in the Mikuni HS jet. I gave you a smaller size but that is just where I would start since you will also be putting some water in the waterbox. If you cap off the waterbox you could go up to 175 on the stinger. By injecting water there you are simulating having a smaller exit diameter and that can help revs.

The advice will vary because they aftermarket parts are designed to be tunable. Different folks have found success or failure following different paths. You should have a tach and a gps so you can study the performance of the ski as you make changes.

 

[All Seas]

Thanks for all the help guys.

The only issue I have it that my stinger does not seem to be tapped.

 

[Matt Braley]

I used to recommend the 4.5mm tap but I think RacerXXX figured out that the size of the HS jet is 5mm (the same as the screws that hold the covers on).

 

[racerxxx]

I used to recommend the 4.5mm tap but I think RacerXXX figured out that the size of the HS jet is 5mm (the same as the screws that hold the covers on).

I think so, try it in one of the carb end plates. Should be 5mm