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Thread: Loss Of Rpm's

  1. #1

    Loss Of Rpm's

    i have a 2005 rxp i have a stage 2 riva with titanium valves, retainers, light cam gear, new head, new stock cam, rr oil jet, rr cam chain tensioner. im only going 7100rpms......!!!!! i have changed ecu, mpem, waterbox without holes mod, gooseneck without cutting, fuel rail, injectors, blowoff valve, knock sensor, air temp. sensor. map sensor, intake malifold, throttle body,coils, spark plug to ixu27, pump with another 15/20r, fuel pump, display (don't ask me why "dumb friend"), resealed sc, changed wear ring, where are my RPM"S!!!!!!!!!!!!!!!!!!! PLEASE HELP BEFORE I GO BROKE!!!!!
    Last edited by bling_bling_420; 08-01-2006 at 07:31 AM.


  2. #2
    rxpblast's Avatar
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    ur prop may need a tweaking. PM Green Hulk and he can do it for u.

  3. #3
    Got Boost? psycho rxp's Avatar
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    what ECU are u running? You could have a boost leak, or SC clutch could be slipping. where is your oil level on the stick?

  4. #4
    Oil level is between the dents, if i put 2005 rr ecu i can get 7400rpms out of it and 70.1mph. My leak % is 4.5%,5%,4%. my compression is 160 psi all across.
    Last edited by bling_bling_420; 08-01-2006 at 07:33 AM.

  5. #5
    Moderator Franko's Avatar
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    160 psi compression is awefully high. Sounds to me like your cam timing is too far advanced. You might try retarding your cam timing to get 130 psi.

  6. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by bling_bling_420
    if i put 2005 rr ecu i can get 7400rpms out of it
    You have to cut the knock sensor resistor out of the wire harness. That is why your RPM's are low at 7400.

  7. #7
    it says MY 2005 on it, do i still have to remove my knock sensor circuit (bulky looking thing).

  8. #8
    "Green Hulk" what do you do to the impeller that they told me to do. something about taking 2mm out of the trailing edge. How do i do that?

  9. #9
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by bling_bling_420
    it says MY 2005 on it, do i still have to remove my knock sensor circuit (bulky looking thing).
    Yes, you have to cut the resistor out of the harness when you run the Rotax Racing ECU with an 05 RXP

  10. #10

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    repitching is not going to do it,i ran a 15/20 in a stage one and got more rpms than what your getting, knock sensor had to be taken out of my 05. when you get her running around 8100 take your prop of and send it to jerry , buy sume velcrow for your but because 80 is around the corner/ 78.2 with no skegs .

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