Results 1 to 5 of 5

Thread: di speed issue

  1. #1

    di speed issue

    01 gtx di. Just did a top end rebuild at .40 over, have done them with no issues before. I have a hard time getting past 53, 54 mph. Pump is pefect, impeller appears fine, idle and acceleration seems normal. Top end lacks. I did clearance the raves, took about a thin marker line off (hopefully not too much). Any ideas?

  2. #2
    Waterluvr's Avatar
    Join Date
    Mar 2015
    Northern Indiana
    Fuel pressure, if your not hitting the magic number the top end is no where to be found. Di pumps are dropping like rocks this season we've had more bad ones this year than the previous ten combined.

  3. +1 by:

  4. #3
    Myself's Avatar
    Join Date
    May 2007
    North Central Arkansas
    Pump, which was probably also the cause of the first top end failure. Possibly just need to change all the fuel filters.

  5. #4
    Thanks, I'm going to tee in a gauge and see if pressure holds @wot. The pumps I've had go bad went from working to nothing.

  6. #5
    Not sure about top end failure as result of lean condition. Every di I've done it's been front cylinder damage, all of them very similar, damage on top edge of piston around rings. Unlike carb engines or other makes where piston is squeezed due to lack of oil or overheat. Kind of weird. I don't think they receive enough top end lubrication since they're direct injected. I increase the piston to cyl clearance a little and haven't had a rebuild come back yet.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Got some speed issues.....
    By OneEyedHito in forum 4-Tec Performance
    Replies: 16
    Last Post: 01-06-2010, 01:30 PM
  2. 1996 SLT 780 Speed Issues now.
    By pastordug in forum Polaris How To & FAQs
    Replies: 8
    Last Post: 09-06-2009, 10:19 AM
  3. 2001 GTX DI speed and rpm loss
    By Jabo in forum 2-Stroke Performance
    Replies: 3
    Last Post: 07-29-2009, 03:08 PM
  4. RX-DI reverse issues
    By emack10 in forum 2-Stroke Performance
    Replies: 11
    Last Post: 07-21-2009, 04:29 PM
  5. 2003 RX DI maint issues
    By Vagaondracing103 in forum Sea Doo Open Discussion
    Replies: 0
    Last Post: 06-16-2009, 10:45 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