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  1. #1
    Sly Fox DKFox's Avatar
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    Question Break in period for a top end rebuild?

    I just finished rebuilding a 1998 SeaDoo SPX. I’ve cranked it a dozen times are so on the trailer. Never exceeded 10 seconds each time before purposely shutting it down due to not having a water hose attached. The ski seems to take a throttle well and idle well. Tomorrow I’m heading for the river since the boat ramp is only 5 minutes from my house.

    My question is this: Is there a “break in” period for a top end rebuild? Or if all performs and sounds well can I take it to WOT tomorrow? Just don't want to find out later that I should have kept it under a certain RPM for a while.


  2. #2
    Throw a little oil in the tank and don't hold it wide open for longer than 10 seconds for the first full tank of gas. After that, ride it like it owes you money

  3. #3
    96XPSS's Avatar
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    Do a search, we've discussed this many, many times.

  4. #4
    abarrassr07's Avatar
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    heres all you need to know and then some

    http://www.greenhulk.net/forums/show...ighlight=break

  5. #5
    Paradise rider aruba yamaha's Avatar
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    Quote Originally Posted by 96XPSS View Post
    Do a search, we've discussed this many, many times.
    Yeah its a topic that seems to come back. I've heard a lot of things. I also believe it depends on wich pistons you have used. I know that for example wiseco pistons (forged) need a little more break in then cast pistons. With forged pistons, even after break in, you should proper warm up your engine before revving it up. I personaly use pro X pistons. I always break in using pre mix gas at 40:1 and taking the first tank not more then half throttle. By the second tank I always I use the first half the same way and the second half with a few full revs, not longer then 10 seconds
    After that ride with it without mercy. But I've heard from an contreversial website that recomends to rev it up all the way but after proper warm up. Ride it hard. I think it's up to you if you want to take that risk. I don't

  6. #6
    96XPSS's Avatar
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    Quote Originally Posted by abarrassr07 View Post
    heres all you need to know and then some

    http://www.greenhulk.net/forums/show...ighlight=break
    Thanks for digging that thread up. BTW...I found the detailed break in procedure last week looking through my old documents. I need to scan it and post it up.

  7. #7
    96XPSS's Avatar
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  8. #8
    KrunchovXPL-GTX-RX's Avatar
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    I know a guy who says you can slap it together and whip it WOT all day and it does not matter.

    Me, I use the procedure above.

    That guy has had a LOT of failures, though they were of various kinds. I had a few that turned out to be caused by a bad MPEM.

    You make the call.

  9. #9
    canuck's Avatar
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    Quote Originally Posted by aruba yamaha View Post
    Yeah its a topic that seems to come back. I've heard a lot of things. I also believe it depends on wich pistons you have used. I know that for example wiseco pistons (forged) need a little more break in then cast pistons. With forged pistons, even after break in, you should proper warm up your engine before revving it up. I personaly use pro X pistons. I always break in using pre mix gas at 40:1 and taking the first tank not more then half throttle. By the second tank I always I use the first half the same way and the second half with a few full revs, not longer then 10 seconds
    After that ride with it without mercy. But I've heard from an contreversial website that recomends to rev it up all the way but after proper warm up. Ride it hard. I think it's up to you if you want to take that risk. I don't


    Is this the website you are referring to ?

    http://www.mototuneusa.com/break_in_secrets.htm

    Interesting reading whether you believe it or not.

  10. #10
    Sly Fox DKFox's Avatar
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    Well... I was going to take it out this weekend but two things came up:

    1.) It is now idling at full throttle. Not sure why this just started acting up. (One of the needles must not be closing?)
    2.) It rained here in Alabama this weekend like I've never seen before! I should've just cranked it up and rode it around in the yard. No need to head to the river.

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