Idle speed adjustment, merc 240 EFI - Seadoo Forums

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    Senior Member seadoodude1's Avatar
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    Oct 2008
    Cypress, TX
    1998 Seadoo GSXL & 2000 Seadoo Challenger 2000
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    Default Idle speed adjustment, merc 240 EFI

    The idle speed has gone down to where it wants to stall before I can shift it to reverse or forward and give it some throttle. Is the reduced idle speed an indication of something I need to look at?

    I looked at service manual to see how to adjust idle and just got confused as to what exactly to adjust. How do you adjust idle or should I be looking at something else that is the cause?

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    rookie101's Avatar
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    Jun 2008
    Okotoks Alberta, Canada
    2006 Yamaha AR230 HO 320hp
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    The ECM should control that for you. If the problem started fairly suddenly start by changing the spark plugs.

    Looking for parts for your Doo?? Click HERE

    Find your Mercury M-2 motor and pump parts here!

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    Senior Member johnhibbs's Avatar
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    Jul 2009
    San Diego
    SeaDoo Challenger 2000, year 2001, 240 EFI
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    Default Trick to increase idle speed

    I have had a problem starting my boat sometimes when it is warm. I discovered a trick to give the boat more gas when it is in nuetral. When you turn the steering wheel hard CCW or CW it will give the boat more gas. I don't know what the problem is though. On my boat I think the starter may be getting old.

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