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  1. #1
    Richieb's Avatar
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    SLT750. Hole in PTO piston.

    As per pics, whats the verdict Polaris gurus?

    This is older than I deal with here, but it belongs to a friend who re-built the motor, crank included, but this was his shot.

    It would not rev up unless on the trailer..!!

    Polaris can have some odd traits, so I figured you guys might hit the nail on the head.

    First thing that struck me was fuel pump, but the other cyls are good.

    Maybe a complete strip and re-build of the carbs is one option I am going for first, and then try to figure out if the crank seals are in the right way around, then look for leaks on the lower cylinder itself.

    Whats the verdict?
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  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    This should give a good idea of what else to look at.

    http://www.greenhulk.net/forums/showthread.php?t=82682

    1. make sure there isn't an autocock installed.

    2. check for kinked fuel lines.

    3. were the fuel lines replaced? If so, was the restrictor re-installed into the return line?

    4. Weak fuel pump

    5. most likely dirty or misadjusted carbs

  3. #3
    Richieb's Avatar
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    No Auto-cock.

    BUT.... Einstein changed the fuel lines..... and NO..!!! restricter to be found anywhere on the return line.

    Kinda wrong..!!, in fact a whole bucket of wrong..!!

    Now I gotta find one...11

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Richieb View Post
    ...NO..restricter to be found anywhere on the return line.

    Now I gotta find one...11
    You can make your own

    Polaris Fuji (blue) engine

    What is a fuel line restrictor, and where is it supposed to be located?
    How to make a replacement (1/4" hose barb and Mukuni main jet)

  5. #5
    bowsniper's Avatar
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    You can make one instead. Guys on here know the exact size to drill for it. Just use a piece od brass round stock the right diameter and drill a hole thru it. its small. about 3/8 ' long, should be 1 -1/2 inch off the carb rail on the top return line to the tank. Theres usually a tie wrap around it.(black).

  6. #6

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    I was reading this thread about the restrictors and had a question. Does this apply to the 780 engine or just the 750?

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Wiweeds View Post
    I was reading this thread about the restrictors and had a question.

    Does this apply to the 780 engine or just the 750?
    It mostly applies to the first couple of years of production (1992, 1993, also 1994?), and mostly to the 650 engine.

    If I recall correctly, the 780 engine carbs have the restrictor built into the exit nipple of the last carb.

    It is unclear to me whether all 750 engines needed the external restrictor, or just some of them

  8. #8
    Pain is fear leaving your body.... rlovebk's Avatar
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    Does apply to '94. (needs restrictor)

  9. #9
    bowsniper's Avatar
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    The 94 sl and a 95 slt both had them . On mine anyways.

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by wiweeds View Post
    i was reading this thread about the restrictors and had a question. Does this apply to the 780 engine or just the 750?
    780 no

    650/750 yes

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