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Thread: My rpm are low

  1. #1

    My rpm are low

    Hello friend, i have this moditication on my seadoo: Rotax racing pistons 2 ring, head less 0,8 mm for more compression and chain tensioner rotax r.,rotax r. valve and retainers,riva stud kit,rotax r. ecu R2A + injectors, openloop riva, esxhaust rear and modification waterbox,intercooler with riva tube and super c. impeller rotax r. 137+3mm,4 inch air filter and K&N ,EGT on center cylinder and runnig to 8550 RPM to 800°C, solas 13/18 with 80mm nozle.I think my problem is the manufacture of head much compressed, when I read the various tread and read the various set-up of your pwc not understand if my running is bad or your performance are too many. Thanks in advance for your answers and advice


  2. #2

    photo my pwc

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  3. #3
    Mod less, ride more! troyheb's Avatar
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    Nice ski. When you say running bad, is the speed just not what you think it should be? Or was it running faster and now it is not?

  4. #4
    thanks Troy, first i use 14/19 and rpm are 8500 with 13/18 i produce only 50 rpm very low and sorry i have grate riva.

  5. #5
    Mod less, ride more! troyheb's Avatar
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    Are you running a rrfpr and are you monitoring afr's?

  6. #6

    no

    Quote Originally Posted by troyheb View Post
    Are you running a rrfpr and are you monitoring afr's?
    no friend i don't use afr i have EGT on center cylinder and running to 850° C ciao thanks.

  7. #7
    hero's Avatar
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    have u tryed changing to a bigger nozzle ring..what is your rev limiter set at.

  8. #8

    80 mm

    i have 80 mm nozle and if i change with 82mm i have only rpm and low speed , now i have with 80 mm very very fast acceleration and good speed but with my modification i produce more rpm 8550 is low my ecu is 8800 rev lim, for me problem is head work the head was lowered by 0.8 mm and with this change my engine is because it tends to accelerate high-speed hard but thanks ciao

  9. #9
    Mod less, ride more! troyheb's Avatar
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    You may want to monitor your afrs. What size injectors are you running? You could be you rich at WOT.

  10. #10
    Quote Originally Posted by troyheb View Post
    You may want to monitor your afrs. What size injectors are you running? You could be you rich at WOT.
    My friend might be some but I use brown injectors rotax racing, and I think that if I had my full engine EGT was now the highest temperature is 850 ° C EGT. Hello Thanks for your help

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