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  1. #1

    Join Date
    Jun 2012
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    Just bought a SL750 and a SLT750 and need some advice

    Hello, I'm new to PWC but since I picked up the pair of 95 jet skis I searched around and found this awesome website. I have learned alot from reading various posts but still unsure of things before i run them. They both start up no problem but i am afraid to run them before servicing them. my friends are mad at me for being hesitant and they just want to run the piss out of them as is. this is what i'm currently doing based off of the info on this site:

    1. I need to do a compression test to see where I stand
    2. I inspected the ski's and noticed the old stock fuel pumps still installed, so I ordered the triple output fuel pumps for both
    3. I also ordered the oil block off plate just like recommended here.
    4. i will be removing the carbs because they have been sitting for at least 3 years and I'm almost positive the carbs need to be serviced and filters/hoses replaced
    5. How do I change the crankcase oil?
    6. I ordered the maintenance manual but hasn't arrived yet
    any advice would be greatly appreciated.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome

    Click my signature links for lots of useful info.

    If the oil pump is in place and has good/new hoses then the decision to switch to pre-mix or keep the oil injection system is yours. Many Polaris PWC are still running just fine with the oil system in place. Maintenance is the key.

    Ask your friends to first hand you the cash required for an engine rebuild, then they can decide whether to run them without doing the maintenance

  3. #3
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by metalshack View Post
    Hello, I'm new to PWC but since I picked up the pair of jet skis I searched around and found this awesome website. I have learned alot from reading various posts but still unsure of things before i run them. They both start up no problem but i am afraid to run them before servicing them. my friends are mad at me for being hesitant and they just want to run the piss out of them as is. this is what i'm currently doing based off of the info on this site:

    1. I need to do a to see where I stand
    2. I inspected the ski's and noticed the old stock fuel pumps still installed, so I ordered the triple output fuel pumps for both
    3. I also ordered the oil block off plate just like recommended here.
    4. i will be removing the carbs because they have been sitting for at least 3 years and I'm almost positive the carbs need to be serviced and filters/hoses replaced
    5. How do I change the crankcase oil?
    6. I ordered the maintenance manual but hasn't arrived yet
    any advice would be greatly appreciated.
    Congrats and Welcome aboard
    Sounds good so far.
    1st things firsts Friends are the death to more pwc's. hahaha
    compression test is needed.
    look into the upgraded tripple outlet fuel pump when you rebuild the carbs.
    No oil anywhere in crankcase ,,
    The "how to's" will be great help.
    Enjoy
    Matt

  4. #4

    Join Date
    Jun 2012
    Location
    Tempe, AZ
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    Understood, I will proceed with the maintenance part, thanks for your advice. do you think it is necessary to remove the carbs just because it has been sitting for 3 years even though it starts right up and has 120 hours on it?

  5. #5

    Join Date
    Jun 2012
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    Got it, I did order the triple outlet fuel pumps so i should without question rebuild the carbs ?

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    It comes down to risk. If even one carburetor is gummed up it can damage a piston from lean burn.

    If you clean and rebuild them, you will know they are good.

    Engine hours don't matter that much. Years and maintenance matter more.

  7. #7

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    That makes perfect sense... thank you so much for clearing that up for me, I really appreciate it sir.

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by KEYZBUM View Post
    Congrats and Welcome aboard
    ...
    Matt
    A keyzbum sighting

  9. #9
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    Apr 2012
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    For me, first thing is to get an LED flashlight that will let you get a look at the pistons. This is an EASY way to see what is going on in the ski.

    Ebay has these with flexible necks you can get the LED down in the cylinder and look in. Run the piston all the way down and you should be able to see all the way to the edges of the piston. Do a google search for "greenhulk piston wash" (the search here kinda sucks), and check out what you want it to look like. You will also see any detonation issues or existing damage, which could imply more problems lower in the engine.

    These engines will run with an AMAZING amount of damage, so do not assume cranking and running means they are good to go.

    I don't see the need to ditch the oil injection. You just need to make sure it is functional. I like the idea of it changing the ratio based on throttle.

    I am a n00b here, just now going thru my second SLT780 rebuild, and the only thing I have found wrong in a carb (besides bad adjustments) was a jet that was sealed up with solidified fuel.

  10. #10

    Join Date
    Jun 2012
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    Hey thanks, I will get an led light and follow your advice. remove the sparkplugs and look inside correct?

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