Page 1 of 2 1 2 LastLast
Results 1 to 10 of 18
  1. #1

    Join Date
    Jan 2008
    Location
    bryan college station, tx
    Posts
    259

    94 xp 650 with unknown performance parts questions

    i just picked up a very clean 94 xp 650 for 1500 with a double trailer. I was looking through the papers he had on it and found where aftermarket parts where installed. The list......


    R&D pro flow flame arrestor kit
    Vortex flame arrestor w/bracket...the r&d took its place.
    primer kit...not performance but added.
    westcoast head w/domes.....im guessing this raised my compression too..what octane should i run?
    westcoast dove tail...i dont even know what this is?
    skat trak impeller 13/21.....what will this help..hook up? top speed?

    somebody hand written that the hp should be 95hp and a gain of 3 to 4 mph...


  2. #2
    Paradise rider aruba yamaha's Avatar
    Join Date
    Dec 2007
    Location
    Aruba
    Posts
    305
    +1
    2
    The octane is hard to tell if you don't do an compression test. As far as I understand at stock you can use regular gas. i would use in your case premium gas to avoid detonation. But if it's really high you must run race gas (ouch!! exspensive) Also make sure that the aftermarket flame arrestor uses the bracket that lays between the cylinderhead and the carbs. if this isn't present you really want to place them because without this bracket you get a chance that you manifold can crack. The "dove tail" is the intake grate. They really help your craft to hook up in rough water. I actually like the R&D aquavine more, but it will do. The impeller helps you with the hook up with less cavitation and helps you in the low end and top end. I recomend you change the sponsons too on those craft. I used to have an 95 XP with the 720 engine in it and the sponson swap from stock to an set of beach house was an difference like night to day. Congrats on you purchase and have fun with it. I really like the older X-4 hull better then the newer XP's hulls. Nice "playfull" craft.
    Last edited by aruba yamaha; 04-16-2008 at 06:49 PM.

  3. #3
    785xp's Avatar
    Join Date
    Feb 2006
    Location
    Canada
    Posts
    897
    +1
    7
    The carbs should have new jetting if they have flame arresters on them. Make sure this was done before you blow it up.

    You will need to do a compression test to see what compression the head is. There are different domes for different compressions. Chances are it is around 180 psi in which case you will want to use 93 octane. With the price of gas, you might want to find a stock head for it.

    The Westcoast Dovetail is an intake grate which will help with hook up in rough water conditions, yet scrub a tiny amount of speed in flat water.

    The 94 XP was 80 hp, and the mods described won't bump it quite as high as 95 hp, maybe 85 hp.

    If you have access to a handheld GPS, you can find your real top speed.

    Let us know if you have any other questions.

  4. #4

    Join Date
    Jan 2008
    Location
    bryan college station, tx
    Posts
    259
    Quote Originally Posted by 785xp View Post
    The carbs should have new jetting if they have flame arresters on them. Make sure this was done before you blow it up.

    You will need to do a compression test to see what compression the head is. There are different domes for different compressions. Chances are it is around 180 psi in which case you will want to use 93 octane. With the price of gas, you might want to find a stock head for it.

    The Westcoast Dovetail is an intake grate which will help with hook up in rough water conditions, yet scrub a tiny amount of speed in flat water.

    The 94 XP was 80 hp, and the mods described won't bump it quite as high as 95 hp, maybe 85 hp.

    If you have access to a handheld GPS, you can find your real top speed.

    Let us know if you have any other questions.

    180psi...dang...all i know is that the guy i bought it from has had it for 6 years and bought it from the guy that did these things to it. Way back in 1996. With that said would the carbs need to be jetting again? since thats been 12 years ago.

  5. #5
    785xp's Avatar
    Join Date
    Feb 2006
    Location
    Canada
    Posts
    897
    +1
    7
    If it had flame arresters on that long, chances are the jetting is fine. You will want to open up the carbs anyways to replace the little internal filters. While in there, you might as well document the jets and compare them to stock.

    You can also do a search on "tempo" fuel line. It is the grey Seadoo fuel line that needs to be replaced. It goes bad over time and will gum up the filters in your carbs to the point of blowing up an engine.

  6. #6

    Join Date
    Jan 2008
    Location
    bryan college station, tx
    Posts
    259
    thanks! im going to look into it today. Also can i block off the oil injection system? Do you recomend it? I know more about yamahas...so

  7. #7

    Join Date
    Jan 2008
    Location
    bryan college station, tx
    Posts
    259
    also is that impeller a good pitch for daily riding

  8. #8

    Join Date
    Jan 2008
    Location
    bryan college station, tx
    Posts
    259
    i just checked the compression on both cyl and they are 165 on both sides. What octane can i use?

  9. #9
    785xp's Avatar
    Join Date
    Feb 2006
    Location
    Canada
    Posts
    897
    +1
    7
    What make of compression gauge were you using?

    Check out this site for impellor recommendations. Remember that your ski is "stock", not limited or modified.

    http://www.impros.com/charts/skat_seadoo.html

    What type of Skat prop do you have? Slimline or Swirl?

    Once you use a GPS to get your top speed. Once you know your baseline, you can compare it to others with the same ski.

  10. #10

    Join Date
    Jan 2008
    Location
    bryan college station, tx
    Posts
    259
    Quote Originally Posted by 785xp View Post
    What make of compression gauge were you using?

    Check out this site for impellor recommendations. Remember that your ski is "stock", not limited or modified.

    http://www.impros.com/charts/skat_seadoo.html

    What type of Skat prop do you have? Slimline or Swirl?

    Once you use a GPS to get your top speed. Once you know your baseline, you can compare it to others with the same ski.
    Actron. i got it from sears. Its the professional kit. It was on a cold engine also. I dont know which type the impreller is. Guess i will find out when i ride it and how it feels. Its been on there for 12 years so i guess it okay for riding.

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. **~*~93 & 94 xp 650's**~*~
    By j34o76e in forum 2-Stroke Performance
    Replies: 3
    Last Post: 05-12-2011, 08:10 PM
  2. FS 94 xp 650 xtra spair parts
    By gtx-x2 in forum Sea Doo 2 Stroke Skis
    Replies: 18
    Last Post: 07-05-2010, 09:54 PM
  3. f/s 94 xp 650
    By johnson7454 in forum Sea Doo 4Tec Skis
    Replies: 5
    Last Post: 09-26-2008, 01:32 AM
  4. 94 xp 650 gps speed
    By johnson7454 in forum Sea Doo Open Discussion
    Replies: 0
    Last Post: 07-24-2008, 10:44 PM
  5. 94 xp 650 problems
    By johnson7454 in forum 2-Stroke Performance
    Replies: 5
    Last Post: 07-11-2008, 02:22 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •