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  1. #1
    mtrager's Avatar
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    Breaking in a 1300 ported motor.

    Just got my single back together and was able to put 3 hrs on
    it after putting in a new crank, oem pistons and having Lowell port my cases.

    I also got my crank from Lowell which was rebuilt from crankworks
    with a big molly bearing. I wish I could show you how awesome it looked
    compared to the stock one.

    I turned the fuel up so high that the ski burned its first tank of gas in 48 miles running mostly around 4000 rpms.

    I did to short bursts wide open every once in a while. I put a small prop on ski so It would not load the motor.

    After 2 full tanks of gas I checked the compression and there is 20 lbs difference between number one and number 3. Three being lower. I have it set up so the rear is 10 lbs less than the other two.

    I guess the rings are still not broke in after two tanks.


  2. #2
    All hail the Chief! fullboogie's Avatar
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    I paid Lowell $20 to lower the compression in your #3 cylinder. Keeping my ducks in a row for MB4

  3. #3
    sleeplessnMS's Avatar
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    I think 20psi is alittle much. Did you do a compression check b/f you broke it in>?

  4. #4

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    I'm no expert on this, but I think you need to gradually lean it down some and do longer runs on it. 3hrs at a very rich setting probably will not heat it up enough to fully seat the rings. Maybe some of the more experienced will chime in...

  5. #5
    mtrager's Avatar
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    Charles, I agree 20 lbs is a lot. I did not check before I ran.

    Lowell says to ride it hard right away to seat the rings. But, after 13 years
    of riding alot I have stuck a few pistons. I think if you are going to run 120 to a 150 hrs a year a mild break in works for me.

    Before rebuild I was 160/160/150. I had to send the front cylinder to millinium to get re done. Last night it was 165/ 160/145. I checked each
    hole 3 times back to back 2 seperate times.

    I also added 16 ounces of oil per tank along with the stock oil injection.
    Which Jims performance recomends I do.

    I know the compression is going to come up and will let you know at 6 hrs.

  6. #6
    I would ride it like you stole it to build some heat in those cylinders and then check it.

  7. #7
    mtrager's Avatar
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    Quote Originally Posted by Ronn25 View Post
    I'm no expert on this, but I think you need to gradually lean it down some and do longer runs on it. 3hrs at a very rich setting probably will not heat it up enough to fully seat the rings. Maybe some of the more experienced will chime in...
    Ronn,

    You are right, I was way fat the first day and NEVER got the motor hot.
    Yesterday I did turn the fuel down a little and took the blubering out.

    Voodoo,

    I will in two more tanks.

  8. #8
    sleeplessnMS's Avatar
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    Yea i would just go and warm it up really good and then run the crap out of it... Atleast get it to peak then slack back down several times.

  9. #9
    mtrager's Avatar
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    Quote Originally Posted by fullboogie View Post
    I paid Lowell $20 to lower the compression in your #3 cylinder. Keeping my ducks in a row for MB4
    David,

    Elliott and I thank you for dinner. It was a good one also.

    Congrads on your new speeds.

  10. #10
    mtrager's Avatar
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    Quote Originally Posted by sleeplessnMS View Post
    Yea i would just go and warm it up really good and then run the crap out of it... Atleast get it to peak then slack back down several times.
    I can not wait.

    I did do a few whole shots with a small scat prop and scat pump
    With Seadoolover on my Rxp carrying a long tow rope.

    It seems to have a lot on the bottom. Sounds really good.

    After putting 30 hrs on the Rxp The Gp feels awful wide.

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