Results 1 to 6 of 6

Thread: Im stumped

  1. #1
    Chrisx88's Avatar
    Join Date
    Oct 2018
    Location
    Rochester NY
    Posts
    105
    +1
    5

    Im stumped

    1997 Seadoo GTX 787

    Got this ski as a junk throwaway someone didnt want. Rebuilt motor, carbs rebuilt, fuel lines, oil lines, etc etc etc. Not my first rodeo. Anyways, it will not start and backfires through exhaust. Ive checked RV timing, ive swapped RV plates with others i have, incase i grabbed wrong one when assembling engine. Suppose to have 159 degree correct? Flywheel key is good. Mag is good, you cant put it on backwards. Where do i go next?


  2. #2
    Chrisx88's Avatar
    Join Date
    Oct 2018
    Location
    Rochester NY
    Posts
    105
    +1
    5
    Single coil, both cylinders fire at same time. is it possible to have plug wires on wrong cylinders?

  3. #3
    No. Every time Iíve had backfiring, it was RV related. Make sure you are checking timing with the front cylinder at TDC.

  4. +1 by:


  5. #4
    Chrisx88's Avatar
    Join Date
    Oct 2018
    Location
    Rochester NY
    Posts
    105
    +1
    5
    I dont know what i did, but its running mint now, lmao. I removed flywheel / mag, inspected. Redid RV timing even though it looked spot on. And changed the black / white wire on coil. 1 of those fixed it, lol.

  6. #5
    Tool Bag water worx's Avatar
    Join Date
    Aug 2006
    Location
    Sunny Fla
    Posts
    2,159
    +1
    105
    Sometimes metal filing can stick on the ignition pickup & cause what you described.

  7. +1 by:


  8. #6
    Crap water filled fuel.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. still stumped . HELP!!!!!!!
    By juggaloXPracer in forum 2-Stroke Performance
    Replies: 6
    Last Post: 07-13-2009, 09:07 AM
  2. i'm stumped. need some outside help
    By SUCKMYWAKE in forum Yamaha PWC Performance (2-stroke)
    Replies: 21
    Last Post: 05-23-2007, 12:16 PM
  3. Okay, I am stumped
    By absentx in forum Polaris Open Discussion
    Replies: 11
    Last Post: 01-30-2007, 10:56 PM
  4. I'm stumped!
    By IrishGpr05 in forum Yamaha PWC Performance (2-stroke)
    Replies: 6
    Last Post: 01-18-2007, 09:46 AM
  5. Stumped?
    By GPR FL in forum Yamaha PWC Performance (2-stroke)
    Replies: 14
    Last Post: 09-10-2006, 08:11 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
  •