Rotary valve question

[anthonygrato]

This is from the 96 shop manual.

13, Rotary Valve
The rotary valve controls the opening and closing of the inlet ports. Therefore its efficiency will de- pend on the precision of its installation.
IDENTIFICATION OF THE ROTARY VALVE
There is no identification code on the valves. To find out the duration, place an angle finder on the valve and measure the valve cut-out angle or use the following templates.
Engine
Rotary Valve P/N
Valve Duration
587
290 924 508
147°
717 and 787
290 924 502
159°

This is from the 95 shop manual.

13, Rotary Valve

Watercraft Model
SP (5873) SPI (5875) GTS (5815) Rotary Valve P I N 290 924 508 valve duration 147*
SPX (5874) XP (5857) GTX (5863) Rotary Valve P I N 2 924 502 Valve Duration 159*

I have a 717 HX. I replaced the engine and I am using the rotary valve and cover from the old one. Which is a 147*
My question is should I be concerned about what the new engine had for a rotary valve?

 

[racerxxx]

AG,

You should have the 159 degree in that 717. A few pages down you can print out the page and lay your RV on it to determine exactly which one you have. If you can't find that let me know and I'll send the PDF to you.

 

[anthonygrato]

Racer
I have the rotary degree gauge tool. If that's what it is call. And I was reading the manual for the 95 and realized I saw different info on the 96 manual that has a HX on it. So I pulled the cover off again and sized it up and it's a 147* rotary valve. I have the page you are talking about. But the one I'm using came from the dead engine. My concern is there is conflicting info between the years in the manuals. If you look at page 04-04-10 they say its 147*
This is why I'm confused!
Also the 95 manual says nothing about a HX.

 

[griz400]

once you figure out what valve you have, here is a short video of a cut out engine, and watch it and it takes all of the guesswork out of installation, and gives you a generalization of just how everything works http://www.youtube.com/watch?v=ULL5gfQs_UA

 

[racerxxx]

I just checked the fiche online from 94 to 97 and they all call out the 502 which SHOULD be the 159. Perhaps someone else was in there? Who did you get the new mill from and do they know what it came out of? That could answer it, possibly BRP used a diff. valve for a different ski? I'll read my 95 manual in a minute.

 

[griz400]

95 96 and 97 all show the 159 valve http://www.shopsbt.com/sea-1997-hx/45-101-01A.html
http://www.shopsbt.com/sea-1996-hx/45-101-01A.html

http://www.shopsbt.com/sea-1995-hx/45-101-01A.html

 

[anthonygrato]

The engine I got from Matt. The rotary valve came from the old engine I pulled. When you use the rotary degree wheel to measure one you start a 360 degrees and the other side gives you the degrees correct?
Griz I will watch the vid now.

 

[racerxxx]

That was going to be my next question are you talking about the degree wheel on the RV or are you actually talking about the metal RV itself?

 

[anthonygrato]

I put the degree wheel on the metal plate which I though was the rv. That reads 147* from one side to the other.

Is that that correct way to check what one you have?

Griz I watched the vid it just shows how to time it not how to check which one you have.

 

[Jetskigoodies]

Ok i know youre working on a 787, another model may have used a different plate but you will need to use either the plate out of your old motor if it is in good shape or buy a new one that is correct for your gsx which should be 159. The motor is the same but your electronics will be different, when you are timing a motor it is to make sure you are getting spark at the correct time and allowing fuel and oil to move up at the correct time, hence TIMING Each motor is timed slightly different, but all the 787s i have apart in the basement have the same plate and they are out of a 98 spx, 96 xp, 97 xp, 96 gtx, and i just timed a 97 xp today. I dont know why you woukd have a different valve, unless someone else stuck the wrong one in.

 

[Jetskigoodies]

That is the correct way to check it, so obviously you need a different one than the one you are measuring.

 

[Jetskigoodies]

The one you have is for a 587


Here is a brand new one
http://www.ebay.com/itm/New-Sea-DOo..._Watercraft_Parts&hash=item3f01ad25ea&vxp=mtr
I think if you shop around you could get one cheaper or even a good used one

 

[anthonygrato]

Ok i know youre working on a 787, another model may have used a different plate but you will need to use either the plate out of your old motor if it is in good shape or buy a new one that is correct for your gsx which should be 159. The motor is the same but your electronics will be different, when you are timing a motor it is to make sure you are getting spark at the correct time. Each motor is timed slightly different, but all the 787s i have apart in the basement have the same plate and they are out of a 98 spx, 96 xp, 97 xp, 96 gtx, and i just timed a 97 xp today. I dont know why you woukd have a different valve, unless someone else stuck the wrong one in.

Wooooooo did I say 787? I meant 717. Is this where the confusing is?

 

[Jetskigoodies]

Nope, that is still wrong


The rv you have works on
147


Applications:

1992 Sea-Doo GTS Rotary Valve
1992 Sea-Doo GTX Rotary Valve
1992 Sea-Doo SP Rotary Valve
1992 Sea-Doo SPI Rotary Valve
1992 Sea-Doo XP Rotary Valve

1993 Sea-Doo GTS Rotary Valve
1993 Sea-Doo GTX Rotary Valve
1993 Sea-Doo SP Rotary Valve
1993 Sea-Doo SPI Rotary Valve
1993 Sea-Doo SPX Rotary Valve
1993 Sea-Doo XP Rotary Valve

1994 Sea-Doo GTS Rotary Valve
1994 Sea-Doo GTX Rotary Valve
1994 Sea-Doo SP Rotary Valve
1994 Sea-Doo SPI Rotary Valve
1994 Sea-Doo SPX Rotary Valve
1994 Sea-Doo XP Rotary Valve

1995 Sea-Doo GTS Rotary Valve
1995 Sea-Doo SP Rotary Valve
1995 Sea-Doo SPI Rotary Valve

1996 Sea-Doo GTS Rotary Valve
1996 Sea-Doo SP Rotary Valve
1996 Sea-Doo SPI Rotary Valve

 

[Jetskigoodies]

Sorry about the 787 reference i thought this was on your gtx, that was my mistake, i didnt mean to make this more confusing

 

[anthonygrato]

I just checked the old motor it's a 717 on the motor number. The new one say 717 also.
So they are both are 717.

 

[Jetskigoodies]

The one you need is a 159 for sure, that will fit


Applications:

1994 Sea-Doo XP Rotary Valve

1995 Sea-Doo GTX Rotary Valve
1995 Sea-Doo HX Rotary Valve
1995 Sea-Doo SPX Rotary Valve
1995 Sea-Doo XP Rotary Valve
1995 Sea-Doo XP800 Rotary Valve

1996 Sea-Doo Challenger Rotary Valve
1996 Sea-Doo GSX Rotary Valve
1996 Sea-Doo GTI Rotary Valve
1996 Sea-Doo GTX Rotary Valve
1996 Sea-Doo HX Rotary Valve
1996 Sea-Doo SPX Rotary Valve
1996 Sea-Doo XP Rotary Valve

1997 Sea-Doo Challenger 1800 Rotary Valve
1997 Sea-Doo Challenger Rotary Valve
1997 Sea-Doo GS Rotary Valve
1997 Sea-Doo GSI Rotary Valve
1997 Sea-Doo GSX Rotary Valve
1997 Sea-Doo GTI Rotary Valve
1997 Sea-Doo GTS Rotary Valve
1997 Sea-Doo GTX Rotary Valve
1997 Sea-Doo HX Rotary Valve
1997 Sea-Doo SPX Rotary Valve
1997 Sea-Doo XP Rotary Valve

1998 Sea-Doo Challenger Rotary Valve
1998 Sea-Doo GS Rotary Valve
1998 Sea-Doo GSI Rotary Valve
1998 Sea-Doo GSX Rotary Valve
1998 Sea-Doo GTI Rotary Valve
1998 Sea-Doo GTS Rotary Valve
1998 Sea-Doo GTX RFI Rotary Valve
1998 Sea-Doo SPX Rotary Valve

1999 Sea-Doo Challenger 1800 Rotary Valve
1999 Sea-Doo GS Rotary Valve
1999 Sea-Doo GSX RFI Rotary Valve
1999 Sea-Doo GTI Rotary Valve
1999 Sea-Doo GTS Rotary Valve
1999 Sea-Doo GTX RFI Rotary Valve
1999 Sea-Doo SPX Rotary Valve

2000 Sea-Doo GS Rotary Valve
2000 Sea-Doo GSX RFI Rotary Valve
2000 Sea-Doo GTI Rotary Valve
2000 Sea-Doo GTS Rotary Valve
2000 Sea-Doo GTX RFI Rotary Valve

2001 Sea-Doo GS Rotary Valve
2001 Sea-Doo GTI Rotary Valve
2001 Sea-Doo GTS Rotary Valve
2001 Sea-Doo GTX RFI Rotary Valve

2002 Sea-Doo GTX RFI Rotary Valve
2003 Sea-Doo GTI LE RFI RAVE Cap Kit
2004 Sea-Doo 3D RFI RAVE Cap Kit

2005 Sea-Doo 3D RFI RAVE Cap Kit
2005 Sea-Doo GTI LE RFI RAVE Cap Kit

 

[anthonygrato]

Hey jetskibuddie
Do you the 95 and 96 manuals. Page 04-04 09 is the info in the 95 I think.

 

[griz400]

on post 6 i listed the 3 different years for the 720 in your hx, it lists the 159

 

[Jetskigoodies]

I do have the manaul, but its at the shop not at home, so i will be useless on that until tomorrow

 

[anthonygrato]

I guess I'm confused why the 95 manual would say two different things
I just checked the 96 manual it has the same thing one pages say 147 and the others says 159

 

[Jetskigoodies]

In 95 and 96 they did use 147 but only on gts sp spi
The reason it is in the book is for the models in 95 and 96 that used the 587 motor

 

[anthonygrato]

In 96 they did use 147 but only on gts sp spi

Did you find that in the manual? The HX is a 95 tho. But it's not in the 95 manual that they made a HX. Does it get timed by the engine gears or the mpem?

 

[anthonygrato]

Ok ive been searching check this thread out


http://www.seadooforum.com/showthread.php?53332-Rotary-Valve-Timing-Question

 

[Jetskigoodies]

I know its a 95 and a hx and a 717, i have sold 1 before. What manual do you have? Seloc,clymers or the seadoo shop manual? You are timing the motor to work with the mpem. The mpem controls the spark, the correct positioning of the rv opens the port so fuel and oil are allowed to pass into the cylinder then the piston pushes the air, oil mixture to head where at the calculated time the mpem send a current to the spark plug to then produce a spark at a precise time, you then get a kaboom which pushes the piston down and the same process happens in the other cylinder. So all you are doing is putting everything in its correct place for all of this to happen at precise times. There is more that goes into it, as fuel and air mixture is pushed up through tranfer ports and the other side will close to hold pressure and allow the mixture to be forced down. Not a simple thing for me to describe i guess. But just to give you an idea what you are doing. As i stated before the same motor(717 in your case) may be timed differently depending on the model but uses the same rv.