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Thread: rotax ecus

  1. #1
    !!!! wave jumper !!!! 05_RXP's Avatar
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    rotax ecus

    hey guys im am wanting to hit the big 80 by next year and i have been looking at ecus. riva quit making the ones for 04-05s which sucks. so i have been looking at the rotax 8400 and 8600 rpm. is there much difference between the two? do both ecus need the valve train to be upgraded. do both have to have the tps zeroed, how do you zero the tps if needed and finally will those ecus with an x charger 42s and rrfpr support fueling for 80mph


  2. #2
    Having Fun jp1300r's Avatar
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    You can't hook a Rotax Racing ECU to BUDS to reset anything. Best bet is to get a Les Cooke reflash or find a used RIVA ecu for your year.

  3. #3
    MSRXP's Avatar
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    Quote Originally Posted by jp1300r View Post
    You can't hook a Rotax Racing ECU to BUDS to reset anything. Best bet is to get a Les Cooke reflash or find a used RIVA ecu for your year.
    +1 on the LC reflash. It is the route I am going after doing a good long while of research.

  4. #4
    Hondapro210's Avatar
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    Les Cooke is still flashing 04-05 ecu's ?
    What does he usually charge if still possible.

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    MSRXP's Avatar
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    Quote Originally Posted by Hondapro210 View Post
    Les Cooke is still flashing 04-05 ecu's ?
    What does he usually charge if still possible.
    $795.00 ish I believe.

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    Ive got a 2007 rxp and i installed valve retainers with my 8600 rotax ecu but for some reason my dash isnt working anymore?? does anyone have any suggestions??

    it sucks rec riding without trim and fuel guage

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    richrxp's Avatar
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    Quote Originally Posted by streeta View Post
    Ive got a 2007 rxp and i installed valve retainers with my 8600 rotax ecu but for some reason my dash isnt working anymore?? does anyone have any suggestions??

    it sucks rec riding without trim and fuel guage
    Did you buy a used one?
    Normally when you install a new one,it installs itself,no buds needed.
    I installed mine 2 years ago,leave the key on when installing,after a few minutes you get a few beeps,now you can start the engine and all functions will work.
    For resetting the ecu you will have to go to rotax.

  8. #8

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    The very early 04 rotax ecu 8500 rev limiter can be accessed with buds and has knock sensor working and needs programmed key. The next one's had 8500 rev limiter with knock sensor but can't be accessed with buds. The next ones were 8600 with no knock sensor and can't be accessed by buds. I didn't know they offered a 8400 for 04/05 .

  9. #9

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    Quote Originally Posted by richrxp View Post
    Did you buy a used one?
    Normally when you install a new one,it installs itself,no buds needed.
    I installed mine 2 years ago,leave the key on when installing,after a few minutes you get a few beeps,now you can start the engine and all functions will work.
    For resetting the ecu you will have to go to rotax.
    Yeah ok that's interesting I wonder if that will work so you leave your key in then plug your ecu in then wait a few minutes for a beeep??? Ok I will give that a try

    And yes it was purchased secondhand and it came off a Rxt mine is a rxp if that makes any difference
    So if that doesn't work is there anything else I can do or do I just try a different ecu??

  10. #10
    !!!! wave jumper !!!! 05_RXP's Avatar
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    ya i wish riva still was making the 04-05 ecus. the reason i ask is because a guy is selling the rotax ones but i just dont like the idea any key will start no knock sensor and not being able to hook up buds. and on top of that i hate buying used electronics off the internet. if you guys know anyone with the riva they want to get rid of send them my way

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