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fuel Pump Issues?

This is a discussion on fuel Pump Issues? within the Grom Performance forums, part of the Honda Grom Garage category; I have a high compression 125 grom running a finbro eco and pdx150 injector, bike has about 6000 miles on it. This just started recently ...

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Thread: fuel Pump Issues?

  1. #1
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    fuel Pump Issues?

    I have a high compression 125 grom running a finbro eco and pdx150 injector, bike has about 6000 miles on it.

    This just started recently when riding some times it rides perfect I can zoom around close to 75mph, but then say like 10 seconds later it will feel like its bogging and not go above 60mph. You could be riding it when its not going above 60mph then all of a sudden it will take off back up to 75mph and run like its always been.

    Does this sound like a fuel pump issue to anyone? The pump does sound louder then my 2018 grom, but I have had no issue until last month??
    2015 Grom - High Compression 125 Build
    2018 Grom - 143cc BigBore
    1986 Spree - 70cc BigBore
    2017 DRZ400SM

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    Check all connections to the ECU if you did do a pin relocation of ECU connection for the Finbro ECU, check to make sure your F/I is connected solid, make sure your battery cable to the + and - has good connection.

    good luck

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    What is your AFR before and during this "bogging" period?
    2018 Grom
    Koso 170 4V/34mm TB/Koso injector/ DIY intake/ aRacer Mini5 + AF1 + DG1
    Koso pump & chain tensioner/ Stock clutch ring / 60% stiffer springs
    Takegawa Crank Support Bearing / Takegawa Catch Can / Kitaco Clutch cover
    Clear cam sprocket cover/ Egay oil Cooler
    Ohlins F&R / Hindle exhaust w DB killer / Galfer brake line w EBC HH Pads
    Pro Taper grips, G2 throttle tube / Gromfatherz axle spacers
    Kepspeed alum. swingarm / Bar end mirror, RAM mount, USB Port
    Seat Concepts / Opmid V2


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  5. #4
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    Quote Originally Posted by WV_Grom View Post
    What is your AFR before and during this "bogging" period?
    I don't have a gauge on it, I should get one for it as the exhaust already has a spot for a wideband. My buddy put 40 miles on it yesterday and it didn't act up once and it ran like a dream. Its very strange when it does it tho.
    2015 Grom - High Compression 125 Build
    2018 Grom - 143cc BigBore
    1986 Spree - 70cc BigBore
    2017 DRZ400SM

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