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Thread: Break in period

  1. #1

    Break in period

    Going to be putting my motor back together soon. My cylinders have been replated, I have new piston kits, wave eater clips, new oil lines with pinch clamps, carbs re-done by OsideBill. Once complete again, how should I break in the motor and for how long before hitting it hard?

    PS...it's a 2004 800xlt

    Thanks


  2. #2
    I usually take it easy for the first tank, are you premix or oil inj? If you are oil inj make sure you add enough oil to the fuel to richen it up for the break in. The second tank i start to get into her a bit, keep the RPMS changing if you can not just go cruise. The third tank i run her wide open if all looks good. Sometimes i like to look at the cyl to make sure they look good, but thats cause i have an EFI controller to tune.

  3. #3
    PolarisNut's Avatar
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    Vary the throttle for the first 30 min or so, then take a few short WOT bursts, followed by part throttle...then repeat. Second tank of fuel, ride it how you want. No need to baby the thing, just don't run it WFO for long periods. This is how i've done it for years, and it's worked out just fine.

  4. #4
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    Quote Originally Posted by PolarisNut View Post
    Vary the throttle for the first 30 min or so, then take a few short WOT bursts, followed by part throttle...then repeat. Second tank of fuel, ride it how you want. No need to baby the thing, just don't run it WFO for long periods. This is how i've done it for years, and it's worked out just fine.
    what he said.

  5. #5
    Yamaha artisan Cutlass's Avatar
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    Quote Originally Posted by PolarisNut View Post
    Vary the throttle for the first 30 min or so, then take a few short WOT bursts, followed by part throttle...then repeat.
    Any need for a cool down period after the first 30 minutes? How long?

  6. #6
    PolarisNut's Avatar
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    Quote Originally Posted by Cutlass View Post
    Any need for a cool down period after the first 30 minutes? How long?
    I've never done any heat cycles with cast pistons...I just ride.

  7. #7
    Is it almost winter yet??? ProXR 440's Avatar
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    More important than the break in procedure would be inspecting everything for leaks with the ski running in the water. I'd run it on the trailer with the pump in the water to let it warm up and keep an eye on it. Then go ride it for 10 minutes varying the throttle working your way up to 1/2-3/4 throttle bursts and come back and look everything over and check the plugs/piston wash. Then take it back out again for 10 minutes hitting it hard and then come back for inspection again. The best way to seat the rings and have maximum compression is to load the motor.

  8. #8
    Yamaha artisan Cutlass's Avatar
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    All great info here. Thanks guys!! I guess it boils down to:
    Don't baby it but don't abuse/beat on it during break in. and vary the throttle/load up and down.

  9. #9
    Thanks guys. i will be putting her back together in the next week and I will let you know how it goes. This site is great for info and advice!!!!

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