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  1. #1
    axelderhund's Avatar
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    Timing mod....no gain

    I did the 6 degree timing mod last night. I took it out on the water today and did not notice any performance gain. avg high speed was still at 65 and rpms were still at 7750-7850, the same as before. My only performance mod is a BOV block off kit which was used for my baseline speed/rpm a few days ago. I was running 93 octane both times. I've read online that most people are getting a .5-1 mph gain with another 200 rpms. Any suggestions?


  2. #2
    DWRAT's Avatar
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    Are you comparing it in the same temps and conditions?
    I know i lose power when it's hot and humid.
    I see you want a Rive plate, I may have on for sale if you really want one.

  3. #3
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by axelderhund View Post
    I did the 6 degree timing mod last night. I took it out on the water today and did not notice any performance gain. avg high speed was still at 65 and rpms were still at 7750-7850, the same as before. My only performance mod is a BOV block off kit which was used for my baseline speed/rpm a few days ago. I was running 93 octane both times. I've read online that most people are getting a .5-1 mph gain with another 200 rpms. Any suggestions?
    Did u do it correctly?
    what was your Rpms before on similar days?


    we need more info to answer accuratly

  4. #4
    kman's Avatar
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    When you tightened the timing wheel bolt, did you turn the timing wheel so the pin rested in the area you ground off? If you didn't turn the wheel before tightening, it could be located exactly where it was before you took it off which would explain the "no difference". Also could be conditions as mentioned above.

  5. #5
    axelderhund's Avatar
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    Yes, it was the same water conditions. The temperature was the same and tests were done two days apart. When I installed the timing wheel, I filed out 1mm to the left. When installing it, I twisted the timing wheel towards the reverse lever (so the nub is now resting on the fresh groove). I put some blue locktite on the 12mm bolt that holds the wheel. I started threading it and before it was tight, I double and triple checked the wheel to ensure that it was still resting on the new groove. I then tightened it down to specs (14 ft pounds I believe, i dont have the manual in front of me). Installed the cover on the engine and torqued the bolts down to 69 in-lbs and put the oil back in the engine.

    Before timing mod:
    7750-7850 rpms
    65 mph avg high
    3/4 tank
    Freshly shaved

    After timing mod (same)
    7750-7850 rpms
    65 mph avg high
    3/4 tank
    5 oclock shadow - maybe this was it!!!!

    DWRAT - I have already ordered the ride plate and it should be arriving later this week

  6. #6
    2005 RXT Red08Ultra250's Avatar
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    8850????? That number sounds way high. Mine went from 7650 to 7900 after timing. 200 to 250 rpm gain seems to be the norm.

  7. #7
    JET250's Avatar
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    8850 rpm......do you cavitate on take off??

  8. #8
    axelderhund's Avatar
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    lol. my bad. I meant 7850. Thats what i get for trying to type in a hurry. I will edit and fix my last post.

    Any ideas about why I didnt see any rpm or performance increase? I just pulled the ride plate, intake grate, steering nozzle in preparation for a ride plate and wedge adjustment. I inspected the impeller, and everything looks beautiful.

  9. #9
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by axelderhund View Post
    lol. my bad. I meant 7850. Thats what i get for trying to type in a hurry. I will edit and fix my last post.

    Any ideas about why I didnt see any rpm or performance increase? I just pulled the ride plate, intake grate, steering nozzle in preparation for a ride plate and wedge adjustment. I inspected the impeller, and everything looks beautiful.
    do a back to back test again

    retuen it to stock, just loosen the bolt twist the rotor while at the ramp to confirm your thaughts,

    you would be the first to say no gain out of many many people

    I am thinking belt/BOV is either leaking or slipping with the extra RPM

    Waz

  10. #10
    axelderhund's Avatar
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    Right on...will do. I've heard that I dont have to pull the oil, but I do have to tilt the jet ski back. Is there a sweet spot past a certain angle?

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