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  1. #1
    Vern's Avatar
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    Full retard vs full advance gained 300+ rpms and almost 4 mph

    Friend of mine was on the water with an 06 RXP with stock 51 cam, all stock motor/ski and ran 7700 rpm and 66.x mph. He checked the cam sprocket, was fully advanced, he moved it to fully retarded and ran 8080 rpm and 70.x mph. Same day, no other changes, done within minutes of each run ...

    If you have not checked your cam timing or tried this, it is quite easy and you might have a nice gain. Stock cam timing seems to be all over the board, so some will see good gains, others not as much, but it is worth looking at.


  2. #2
    fh23rxp-x's Avatar
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    Quote Originally Posted by Vern View Post
    Friend of mine was on the water with an 06 RXP with stock 51 cam, all stock motor/ski and ran 7700 rpm and 66.x mph. He checked the cam sprocket, was fully advanced, he moved it to fully retarded and ran 8080 rpm and 70.x mph. Same day, no other changes, done within minutes of each run ...

    If you have not checked your cam timing or tried this, it is quite easy and you might have a nice gain. Stock cam timing seems to be all over the board, so some will see good gains, others not as much, but it is worth looking at.

    Great info going to check mines right now !!

  3. #3
    Eric Ocman's Avatar
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    Vern, I know I was confused initially which way was which. Can you take a pic or use that pic in the other thread and clarify this please?
    Everyone will benefit.

  4. #4
    Vern's Avatar
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    Good point Eric, I may try to do that later, gotta run to the cottage for now. Oh, one other thing I should mention is there is current where Jim tested, so yes, the speeds may not be totally accurate for a stock RXP, but the DIFFERENCE in speed (GPS) and rpms is legit.

  5. #5
    b_dolla44's Avatar
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    Quote Originally Posted by Vern View Post
    Good point Eric, I may try to do that later, gotta run to the cottage for now. Oh, one other thing I should mention is there is current where Jim tested, so yes, the speeds may not be totally accurate for a stock RXP, but the DIFFERENCE in speed (GPS) and rpms is legit.
    Can you post some more info on how to adjust....
    I wanna play with this some...

  6. #6
    mbaseball3's Avatar
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    You stated in a few mins....doesn't it not involve removing pto cover? Great find btw

  7. #7
    Having Fun jp1300r's Avatar
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    Quote Originally Posted by mbaseball3 View Post
    You stated in a few mins....doesn't it not involve removing pto cover? Great find btw
    No it doesn't.

  8. #8
    mbaseball3's Avatar
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    Quote Originally Posted by jp1300r View Post
    No it doesn't.
    Sweet! So how does one adjust the timing?

  9. #9
    krouchchocolate's Avatar
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    Quote Originally Posted by Ocman View Post
    Vern, I know I was confused initially which way was which. Can you take a pic or use that pic in the other thread and clarify this please?
    Everyone will benefit.
    Someone correct me if I am wrong, but i think by going clockwise you are advancing it. Going counterclockwise you are retarding it.

    http://www.greenhulk.net/forums/show...ghlight=timing

  10. #10
    Having Fun jp1300r's Avatar
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    This is how I do it. Pull the spark plugs, valve cover, get access to the cam bolts, get access to the SCer. If you just want to retard the cam. Loosen the cam bolts, turn the engine by hand at the SCer. You want the the cam bolts to right of the slot on the cam gear. Stick a paper towel under between the cam gear and cylinder head. So as not to drop the big washer and cam bolts down into the PTO cover. Pull one cam bolt at time, apply locktite and re-install. Done.

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