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  1. #1

    1998 polaris slxh 1050 lean/hot condition!

    What's up guys?!

    Recently rebiuld the slxh 1050. Everything inside the motor is new except the crank. Went with the sbt platinum topend kit 1mm over.

    I'll get to it. Had it out on the lake today, felt and ran strong altho could only squeeze out around 6300-6400 rpm. At first shot out of the whole at WOT, then it got to where you can't give it any throttle or it will bog down and die. Before it started bogging I checked the plugs after few minutes of WOT at this point I knew it's way too lean. Plugs were light brown and dry.. nother thing is the motor is very hot to the touch. My previous slxh was cool to the touch even after 10 min of WOT riding. Also MFD started reading low power, followed all the steps on that issue. Checked for good ground at the recictifier, and got same 12+ voltage on other two wires. Also with multi meter I get 13.8 to over 14v when the ski is running * MFD only shows volts to 10.2 when ski is running.

    *note*

    Ski has carbon reeds, converted to premix when I did the rebiuld "50:1". Changed all the fuel hoses with Tygon hose. Went through and rebiuld the carbs " carbs we're clean " used some kits I found on amazon.

    Compression test after founding lean condition.

    Mag 128
    Center 128
    Pto. 134

    What's do you guys think?

    Thanks paul


  2. #2
    Polarisitis loonatik's Avatar
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    These Keihin carbs are tough to tune on the fly. Only low speed adjuster available, therefore you can only tune from idle to 1/3 throttle, the rest is in the jet. For this reason, I'd prefer checking piston wash over plug readings.
    What are your jet settings? Did you compensate for 1 mm bore over?

    As engine is too hot to touch, I'd look through cooling circuit, starting with screen at the pump nozzle.
    Another thing is was the head put on correctly? 'X' marked side is on exhaust side.

  3. #3
    Jets are stock believe like 32 low and 60 high somthing. I will confirm in the morning. As far as the heads go wasn't aware the trailer was a certain way the heads need to be. I'll go through and recheck that in the am aswell. As far as the Jets, what would you suggest running with the 1mm over?

    Thanks for the reply

  4. #4

    Update!!

    Allright update..

    Pulled the headcovers, and found the domes were installed in wrong position, also blew out the hose coming into the water manifold all clear there. No piston wash, but then again only rode it for maybe 5 min. I use amsoil dominator so with the red mixture it's easy to tell where fuel has been, and when I got the carbs out I noticed the top nozzle lines were bone dry and clear yellow compare to the other lines. I then pulled off the little Diaphragm cap that suplies fuel to those nozzles, found the little Diaphragm was shot, "completely see through on one side..


    Also jets are 35 low and 62 highs.. any suggestions where to start on the Jets?

    Also where can I get one of these Diaphragms ? Could this cause the real lean condition I'm having?
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  5. #5
    Just noticed on my spare motor the reeds have these spacer inserts "stock reeds". The carbon reeds on my slxh doesn't have those inserts in them can that be a big problem?
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  6. #6
    Polarisitis loonatik's Avatar
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    Actually there're 3 jet circuit on these carbs, low mid and high.
    Pic #10 in your photo line up, take the phillips head screw off. Your high jet is on opposite side of the (2) small ones.
    Here's a link of my jettings when I had the 1050 with 1 mm bore over:

    http://www.greenhulk.net/forums/show...2759&page=2#14

    That little diaphragm is your accelerator pump, unfortunately it may be a hard to find item by itself. Probably need to buy whole carb set off fleebay to get it. But you can compensate for it by fatten up jettings.

    Hopefully someone will chime in on the reed inserts. I think you'll be fine without them.

  7. #7
    savageman69's Avatar
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    you may possibly make this work? not totally sure tho http://www.ebay.com/itm/NEW-Accelera...VWTiUm&vxp=mtr

  8. #8
    Allright think I'm going to start with the same jets you ran, match the low side settings aswell.

    Question where can buy the correct quality jets? Read alot of posts of ppl talking about cheap jets not being true on the size? Where did you purchase youre jets?

  9. #9
    Polarisitis loonatik's Avatar
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    Could this be the thread you're referring to?
    http://www.greenhulk.net/forums/show...2759&page=3#30

  10. #10
    casey67's Avatar
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    From what I understand, the rod is part in the diaphragm. The Kawasaki used a shorter rod than Polaris.

    I never tried to get the diaphragm off of the rod, not sure if it is posssible.
    Last edited by K447; 08-16-2016 at 08:44 AM.

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