Results 1 to 3 of 3
  1. #1

    GP1200R ... couple questions

    First post here, great source of info BTW. Purchased a used 2000 GP1200R.. it had a few mods done to it, PPK, ProTec ride plate, R&D heads I think thats about it. Over the weekend I did the JetWorks and installed the D-plate.. took it out today, after about an hour of pulling kids on kneeboards and the tube. let it cool down, then went for a WOT run, fastest I could get it was 58 mph, going both directions. The previous best was 62 mph.. These are factory speedo numbers (I know I know), but, it definetely was down power from last time out, way down power. The holeshot was substantially better, but the top end was just not there. Any ideas ? The waverunner has approx 62 hours, and the last compression test had all three cylinders with 3 pounds of each other. Oh yeah it has a solas concorde prop 13/19 I believe are the numbers. Thanks, mike

  2. #2
    WATER WOODY's Avatar
    Join Date
    Aug 2005
    Minden, Nevada, United States
    You need to get some solid GPS #'s and get an aftermarket tack to see were you are at.

  3. #3

    Join Date
    Jan 2006
    Texas City, Texas
    Quote Originally Posted by Fstocker
    The holeshot was substantially better, but the top end was just not there. Any ideas ? Thanks, mike

    The JW mod must have a 3/8 line going from the JW valve outlet into the stinger. If you have a 1/4 line, you will not get enough water to create enough back pressure in the pipe...... you will loose about 150-200 rpms on the top.

    The results would be a significantly improved hole shot but a substantial loss in top end.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. GP1200R engine question
    By SoundByte in forum Yamaha PWC Performance (2-stroke)
    Replies: 8
    Last Post: 10-09-2009, 01:01 PM
  2. couple questions about my RXP
    By spark in forum 4-Tec Performance
    Replies: 3
    Last Post: 05-21-2007, 11:04 PM
  3. Got my RR exhaust couple questions!!
    By CarFanatic in forum 4-Tec Performance
    Replies: 6
    Last Post: 07-19-2006, 09:56 AM
  4. Nitroshark, couple questions?
    By Vern in forum 4-Tec Performance
    Replies: 18
    Last Post: 03-18-2006, 11:43 PM
  5. Jerry, Brendan, couple questions
    By Vern in forum 4-Tec Performance
    Replies: 80
    Last Post: 12-29-2005, 05:42 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