Results 1 to 5 of 5
  1. #1
    TyCast's Avatar
    Join Date
    Aug 2013
    Location
    Willamette Valley, Oregon
    Posts
    75

    Question Carb dripping fuel in 1993 Polaris SL 650

    Hey guys,

    So I have working on my used SL 650 lately, and just finished diagnosing a water leak problem I had where water coolant was leaking into the front cylinder (and a little water into the other 2 cylinders). Apparently, it was a rotted-out head gasket. So, that got fixed.

    If you are interested on the whole back-story, my original thread is here, entited "Erratic Bogging"> http://www.greenhulk.net/forums/show...hlight=erratic

    After that issue was fixed, I noticed a new problem. I did a one-cylinder-at-a-time test, and found that the engine will not run on the front cylinder. I am wondering if the water in the cylinder could have caused this.

    So, after investigating the front cylinder, I found that fuel was dripping from this outlet inside the front cylinder carburetor.

    Heres a photo showing where the carb is dripping fuel. The location is circled in red.

    Click image for larger version. 

Name:	Front Cylinder - Down the Carb.jpg 
Views:	104 
Size:	92.2 KB 
ID:	318610


    On the other cylinders, there was no dripping. Actually, I couldn't see any fuel coming out. Im guessing its being vaporized so it can be used inside the cylinder for combustion?


    From this dripping, I figured that the carb on the front needs to be rebuilt, so I ordered a Mikuni carb rebuild kit. I am not sure this will fix the problem, but I hope it does. Carbs are still pretty mysterious to me, so I not sure how this will work out.

    Any of you guys out there have this issue or know about this issue? What would cause this fuel dripping and how to fix it?



    Thanks,
    - TC


  2. #2
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    6,528
    +1
    1,271
    the needle and seat are not sealing correctly, a rebuild should correct this. a careful examination of the needle should show the problem. On higher hour engines the vibration wears the needle seat to the point where they will leak. you'll also want to check out the float arm and spring setup too.

  3. #3
    john zigler's Avatar
    Join Date
    Aug 2006
    Location
    WI
    Posts
    2,545
    +1
    33
    Rebuild ALL three carbs, and replace ALL needles and seats. be sure to use only genuine Mikuni brand parts. NOT aftermarket inexpensive kits. Also make sure you install the correct needle arm spring, as the standard Mikuni kits do not include the correct 80 gram spring.

    If it has not yet been done, I strongly recommend updating the complete fuel system. replace all lines, update to a triple outlet fuel pump, and replace the fuel select valve.

  4. #4
    wotxxxsd's Avatar
    Join Date
    May 2012
    Location
    Orlando
    Posts
    3,928
    +1
    472
    Tick tick boom...

    No sparks please!!!

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,591
    +1
    1,275
    Quote Originally Posted by john zigler View Post
    Rebuild ALL three carbs, and replace ALL needles and seats. be sure to use only genuine Mikuni brand parts. NOT aftermarket inexpensive kits.

    Also make sure you install the correct needle arm spring, as the standard Mikuni kits do not include the correct 80 gram spring.

    If it has not yet been done, I strongly recommend updating the complete fuel system. replace all lines, update to a triple outlet fuel pump, and replace the fuel selector valve.
    +1 on all this.

    Click my signature links for more info regarding fuel system maintenance.

    John sells a Polaris specific Mikuni carburetor rebuild kit with the parts you need.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Erratic bogging behaviour. Causes? 1993 Polaris SL 650
    By TyCast in forum Polaris Open Discussion
    Replies: 49
    Last Post: 05-02-2016, 02:18 PM
  2. 1993 Polaris SL 650 Overheating Issue
    By TyCast in forum Polaris Open Discussion
    Replies: 4
    Last Post: 08-07-2014, 06:37 AM
  3. 1993 Polaris SL 650 - water in crank case, why and how?
    By onthewater in forum Polaris Open Discussion
    Replies: 8
    Last Post: 09-21-2013, 10:48 AM
  4. 1993 Polaris SL 650 fuel
    By Chrisrider in forum Polaris How To & FAQs
    Replies: 6
    Last Post: 05-23-2011, 02:29 PM
  5. WTB: 3 Outlet Fuel Pump For Polaris SL 650
    By ZOMGVTEK in forum Polaris Classifieds
    Replies: 1
    Last Post: 06-02-2008, 04:49 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
  •