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  1. #1

    96 SLT 750 Pulsing at top speed but not full RPM

    It has been a good ski but cant ever seem to figure this one out

    It runs about 5500 rpm and at that "top speed" it seems to be pulsing..

    I replaced plugs several times and one time when I did it I got just past 6000 rpm for a short time 5 minutes and then it went back to 5500 and pulsing


    I replaced all fuel lines EXCEPT the ones inside the tank
    All supply lines and all on carb rack
    Has 3 outlet fuel pump
    Has 3 new spark plug boots
    Changed the CDI
    Checked to see if it was getting too much oil went to pre-mix and no change

    Fixes I still need to try
    Have bypassed the fuel selector ( not tried yet)
    Have not replaced the lines in the tank
    Is there a return line with a 3 outlet pump that should be crimped?

    Any other suggestions?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Does your machine have a Reserve position on the fuel selector?
    Does the problem change at all when set to Reserve?

    I don't think I have ever heard of the Polaris oil pumps pumping 'too much' oil.

    Have the carbs been pulled apart and cleaned?

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk.

    Please define "pulsing".

    Was the impeller ever changed? If so, to which one?

    Have the carb adjustments been checked?

    Have the carbs ever been rebuilt?

    Have you tried clipping 1/4" off the spark plug wires and rsecuring the plug boots?

  4. #4
    K447
    Does your machine have a Reserve position on the fuel selector? Yes it does
    Does the problem change at all when set to Reserve? No It has not affected it at all
    I do have it bypassed right now for the next trip out

    I don't think I have ever heard of the Polaris oil pumps pumping 'too much' oil. Nor had I but it was a simple try .... I am back to oil injected and yes I burped the oil line

    Have the carbs been pulled apart and cleaned? Carbs have been apart several times and are apart right now... They have new needle and seats and the little round rubber whatever things under the plate on the top of the carbs have all 3 been replaced


    Xlint89
    Welcome to the Hulk.

    Please define "pulsing". It runs about 5500 rpms and you can feel the motor pulsing meaning it gains a few hundred rpms and drops gains drops the gain and drop cycle is about 3-5 seconds approx

    Was the impeller ever changed? If so, to which one? As far as I know the impeller is stock

    Have the carb adjustments been checked? They have not been officially checked though I will do so if someone will direct me to the proper table as long as I have the carb rack out currently

    Have the carbs ever been rebuilt? Yes to the effect of needle and seats and the rubber doo

    Have you tried clipping 1/4" off the spark plug wires and rsecuring the plug boots? I did take off the red stock boots and put on NGK's I will do this fix as well but had strong spark

    That being said did you see my remark that I put new br7es plugs in one time and it ran perfect just over 6000RPMs and loads of power no pulsing for about 5 minutes then right back to the pulsing....it doesnt cut out just rrrRRRrrrRRRrrRR that make sense??

  5. #5
    Beuller ,,,, anyone Beulller

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Click below for the service manual - should have the carb specs.

  7. #7
    You really think its just carb settings???

  8. #8
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    If you want to know if it's fuel/ carb issues, get a small flexable flash light and stick in into the cylinders via the spark plug hole. With the piston at bdc do you find that the domes of the pistons are completely black? Are they washed clean? If the fuel/air ratio is correct, you should see thumb nail sized clean spots on the pistons near the transfer ports.
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  9. #9
    piston wash is good I wouldnt say spot on but its jetted correctly and not running too rich... Next time I take it out I will check wash again

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by fasman View Post
    ....it doesnt cut out just rrrRRRrrrRRRrrRR that make sense??
    Makes perfect sense.

    Unfortunately, I'm having the same issue with mine and can't seem to figure this out.

    How did the new plugs look after you pulled them out?

    Were they all black?

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