Results 1 to 9 of 9
  1. #1
    Rodslinger142's Avatar
    Join Date
    Sep 2014
    Location
    Trinity, NC
    Posts
    12

    HELP! 787 RFI starting / fuel issues

    I have a 787 RFI that will not start. It turns over fine but will not fire. It has good compression and spark. I verified timing with a timing light and compression is about 155psi. The plugs look very wet and the engine looks flooded. If it sits for a while it will fire and run for a few seconds then slowly shut off - as if it is getting flooded by stuck injectors or something. This is happening in both cylinders.

    Does anyone have any suggestions to look at? Could the TPS be off, thinking it is at a higher throttle angle, therefore causing it to inject more fuel? Is this a MPEM issue maybe?

    Thanks in advance!


  2. #2
    Myself's Avatar
    Join Date
    May 2007
    Location
    North Central Arkansas
    Posts
    2,772
    +1
    129
    Check your connections at the ignition coil and make sure they are tight, pins in connectors not pushed back or broke off. Sounds like you have a spark issue.

  3. #3
    Rodslinger142's Avatar
    Join Date
    Sep 2014
    Location
    Trinity, NC
    Posts
    12
    Quote Originally Posted by Myself View Post
    Check your connections at the ignition coil and make sure they are tight, pins in connectors not pushed back or broke off. Sounds like you have a spark issue.

    Spark is good, verified with timing light. I was running it on the hose and it slowly shut off. Pulled plugs and there were very wet with fuel. I can clean plugs, re-install and the engine will fire for a brief second, the shut off - plugs dripping wet again. This is why i think it is a fueling issue. I am going to pull the injectors out today and see what they look like.

  4. #4
    Kmorningstar_rxp's Avatar
    Join Date
    Feb 2015
    Location
    Port orange, Fla
    Posts
    1,638
    +1
    159
    Change the plugs. You would be amazed how many skis I've bought that " didn't run" due to old crap plugs.

  5. #5
    check rotary valve timing
    might have a stripped gear

  6. +1 by:


  7. #6
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    6,529
    +1
    1,279
    I would not go to the injectors just yet...

    if the rv is screwed the same mixture is compressed over and over again..seems like the engine has good compression, but it's the same charge over and over again with added fuel to help drown the engine out.

    quick check:

    remove flame arrestor, put hand over throttle body ( remove and ground plug caps)..crank the engine, you should feel engine vacuum.

    if the engine has high hours ( over 250) the valve may have failed. check the throttle plate. I've seen one of the screws come out and trash the RV.

    RFis tend to be pretty reliable until the crank seals start ailing.

  8. #7
    Myself's Avatar
    Join Date
    May 2007
    Location
    North Central Arkansas
    Posts
    2,772
    +1
    129
    I'm not saying you don't have spark, but you could still have a spark issue. Check coil connections as I said, ohm out coil if you can, try new plugs. Many times a weak spark can seem just like too much fuel.

  9. #8
    Rodslinger142's Avatar
    Join Date
    Sep 2014
    Location
    Trinity, NC
    Posts
    12
    Click image for larger version. 

Name:	2015-03-15 16.37.55.jpg 
Views:	45 
Size:	54.0 KB 
ID:	353801

    Found it, killed RV gear. Thanks for all the suggestions...

  10. #9
    Myself's Avatar
    Join Date
    May 2007
    Location
    North Central Arkansas
    Posts
    2,772
    +1
    129
    Ouch! Your crank is likely bad also.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Newbie needing Polaris SLH Fuel issue help ??
    By joefedererjr in forum Polaris Open Discussion
    Replies: 19
    Last Post: 10-22-2010, 10:48 AM
  2. please help!787 rfi maint flashing wont go out
    By mrjetskey in forum 2-Stroke Performance
    Replies: 1
    Last Post: 08-14-2010, 10:03 PM
  3. 2000 gtx rfi starting issues
    By vodomagoo in forum 2-Stroke Performance
    Replies: 2
    Last Post: 08-02-2009, 01:06 PM
  4. Need some help... 97 XP.. starting issues...
    By midnight08 in forum 2-Stroke Performance
    Replies: 3
    Last Post: 05-29-2009, 12:19 PM
  5. ultra lx and 250x fuel issues, need help
    By bluebalz in forum Kawasaki PWC Performance (4-stroke)
    Replies: 3
    Last Post: 07-12-2007, 08:23 AM

Posting Permissions

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