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  1. #1

    2005 RXP Timing Issues?

    After rebuilding a 4-Tech motor, I timed the engine using piston #3 (front), I used the locking tools (Crank & Cam) and made sure to align the 1503 marks with the head surface. Also, I aligned the two marks on the crank and the counter balance. I checked my compression on the cylinders and came up with 140, 120, 140. After attempting to start the engine (with no luck), i got a very loud backfire.

    W
    ould the 20psi low on #2 cause the engine not to fire and have the big backfire? Can anyone help with this?


  2. #2
    Moderator beerdart's Avatar
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    Check you harness connections there are two that can be swapped.


  3. #3
    Do you know where? Is at the MPEM?

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    Moderator beerdart's Avatar
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    Two in the front oil pressure and temp and two for crank trigger and cam i think its been a while.
    Quote Originally Posted by BVK View Post
    Do you know where? Is at the MPEM?

  5. #5
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    I'd venture a guess....

    if you are not getting a chk engine light when you crank the engine...

    you didn't get the flywheel encoder ring in the correct place, so the timing is way off.

    did you replace the flywheel bolts when the engine was apart?

  6. #6
    Thank you. I am pulling the motor now to check.

  7. #7
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    Quote Originally Posted by BVK View Post
    Thank you. I am pulling the motor now to check.
    Check the encoder wheel for the small ding that the locating pin made when improperly installed

    It’s easy to miss due to the magnetic effect and oily bits

    Backfire a clear clue

    Clean up the bolts and holes and use some red loctite when replacing the flywheel bolts

    Torque to spec indicated on the bolt package you got

    Sniff back to my “screwed the pooch” thread for my journey discovering this problem in a charity case I did this season

  8. #8
    Thank you Pete. You nailed it! The encoder ring was off by (1) bolt hole rotation.

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  10. #9
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    Quote Originally Posted by BVK View Post
    Thank you Pete. You nailed it! The encoder ring was off by (1) bolt hole rotation.
    I heard you yell “ oh my damm look at that” yesterday.

    There is one more thing that needs to be looked at during assembly for those having similar problems

    Wheels that have lightning holes drilled in them have to be installed with the encoder wheel gap not aligned with those holes

    It’s Covered in the manual.

  11. #10
    Blackhawk36's Avatar
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    Is no one concerned about a 14% variance in compression on a new rebuild? Is it possible that the rings would seat during break-in and correct that much variance?

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