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  1. #1
    Mongoose's Avatar
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    Timing advance key question

    How aggresive is the advance?
    I don't want to know how much in degrees,but, do I need to run a higher octane fuel?
    Any long term downsides??
    Thanks.


  2. #2
    Happily Self-Employed WFO's Avatar
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    Definately recommended to run higher octaine fuel. Also best to run the controller a little rich on top end as not to lean the motor.

  3. #3
    The advance that we are runnig is 3 degrees, We have been suing 93 octane. Anytime that you increase compression or timing we move up in octane rating. More than 3 degrees of advance will make the ski detonate!!.

  4. #4
    Mongoose's Avatar
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    Quote Originally Posted by Fercho
    The advance that we are runnig is 3 degrees, We have been suing 93 octane. Anytime that you increase compression or timing we move up in octane rating. More than 3 degrees of advance will make the ski detonate!!.
    So, people who are selling the key with 4 degrees of advance, are selling trouble for the gpr?

  5. #5
    There are quite a few people running 4* without issue. Then again there are those who like to run 165lbs of compression and also like to throw increased timing in the mix. Too much of any good thing can = trouble

  6. #6
    Mongoose's Avatar
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    So, 4 degrees timing advance with a stock head is fine?

    Now another question:
    All else being equal. What's the quickest out of the hole?
    4 degrees of timing advance, or a 150 psi head?
    I know the timing advance is also good for some more rpm, but it's the holeshot im interested in.

  7. #7
    The recomemdation that I have given is based in our findings. I still have not heard of any results that Island Racing have personally done. I keep reading about many out there but not about their own testing and results. We dont how many degrees their keyway measure using a degree wheel on a GPR.

    The combianation of an R&D staggered head, the Keyway, Jetworks Mod and V-Force cages is the one to use for the best holeshot.

    If only you ride in flat water and have no need to make any turns like some,most likely you will never load up the engine but if yo are into rough water setup, holeshot and aggresive turns you will put load in the engine and you better have a package and prop that will accomodate those demands without taking any chances.

    Altitude will play a huge role on the amount of degrees that you can advance also.

    I have seen many people sell their ski's because of failures that have drove them insane to the point of giving up the sport. Be caresull when choosing parts and tuners.

    Once again 4 degrees may make you detonate. We have the choice of any degree of advance that we wanted when it was tested and 3 was choseen for a reason!!!

  8. #8
    Fast1's Avatar
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    You mentioned a R&D staggered head... is this a staggered compression ratio or squish band cut? Was this head, and the rest on the market, designed and intended for the powervalve engine? not neccesariy the the 05/06 non-powervalve motor?

  9. #9

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    purchase keyway

    Where can one purchase the keyway? and how much are they?

  10. #10
    Happily Self-Employed WFO's Avatar
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    Re: purchase keyway

    Quote Originally Posted by mjet
    Where can one purchase the keyway? and how much are they?
    http://www.greenhulk.net/yamaha/view...ready+shipping

    Fercho is out of town so you can call me.

    Rich
    713-725-8596

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