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This topic contains 5 replies, has 3 voices, and was last updated by  andre martins 5 days ago.

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  • #3682

    ♠️ MARCEL
    Administrator
    • Topics: 33
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    Joined:
    Jan 7, 2020
    @mf448kxn6
    Location:
    North UK
    Riding:
    GTR
    Points: 2,996

    You are correct, the efi bikes all have the intake sensors to know air system has changed from the ecu’s settings,  the ecu isn’t going to “upjet” the fuel so to speak.

    i believe the stock filter is a lot of air already since it shares the same filter with certain GV650s.  Some have huge holes compared to the carby era.

    the exhaust lambda sensor is on the pipe ,  i would advise the exhaust system has a baffe hole about 5cm , huge holes won’t work or its too free flowing , you want to be as close to the stock one as possible and you won’t be triggering the ECU ,  you may miss the noise but thats the life with an EFI bike.

    Hyosung didn’t sell any mapping kits for the general public, i don’t think its something they would do , although  it may make life easier for us experienced mechanics when it comes to fuel mapping etc.

    Try the stock filter and consider the exhaust set up 👍

    // Meditation doesn't mean you have to sit still....

  • #3683

    andre martins
    Member
    • Topics: 1
    • Replies: 2
    Joined:
    Jan 7, 2020
    @boltini
    Location:
    portugal
    Riding:
    GD250R
    Points: 29

    Thanks for your answer Marcel. Some updates about my case.

    Disconnected the battery for one night to reset the ecu, connected the battery and the FI light appeared in seconds. on the other hand, with this reset I seem to have solved another problem I had since I bought the bike, I can’t explain but it was a kind of delay that the bike had when it accelerated a bit, it only responded thousands of seconds later.

    I called one of the two dealerships in portugal and they told me they don’t have a machine to read the error, tomorrow I’ll call the other but, is there any way I can read the error at home?

    I’ve got 2 friends with this bike, they both changed the exhaust but they never had this FI error. I’m 100% sure the error is related to the exhaust, because it only appeared since the day I set up the exhaust not forgetting that I’m the only one who has a sports air filter ( i’m waiting for a original hyosung air filter to see if it fix the error)

    The day I rode the exhaust I still managed to walk without the error appearing, and the only difference I notice is that with the error the bike makes more popcorn in the exhaust, do you think I can walk without problems on my bike until the air filter arrives?

  • #3689

    ♠️ MARCEL
    Administrator
    • Topics: 33
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    Joined:
    Jan 7, 2020
    @mf448kxn6
    Location:
    North UK
    Riding:
    GTR
    Points: 2,996

    Pops on exhaust can be a sign of something going on with the injection system if it sounds like misfire.

    The true way of checking is by a mech usually get readings on meters on certain devices as how the service manuals instruct them  based on what issues the bike makes.

    I would consider again your exhaust system. At least go back to the stock filter and exhaust temporarily as it will be easiet to diagnose the bike without mods just yet.

    // Meditation doesn't mean you have to sit still....

  • #3709

    Chris
    Member
    • Topics: 0
    • Replies: 1
    Joined:
    Jan 7, 2020
    @sexualchocolate
    Location:
    Texas ( Not yankee )
    Riding:
    2017 GD250r track bike
    Points: 16

    Your definitely running lean with BMC filter/exhaust and you could be close to being out of injector capacity. Is your exhaust baffled? like the other gentleman noted, these little engines need a baffle in the muffler ( without the ability to see air/fuel ratios ). I bet swapping out the air filter to OEM and resetting your battery fixed the issue. I have one of these little bikes and it already runs lean from the factory….just like those KTM RC390s

  • #3710

    andre martins
    Member
    • Topics: 1
    • Replies: 2
    Joined:
    Jan 7, 2020
    @boltini
    Location:
    portugal
    Riding:
    GD250R
    Points: 29

    Thanks for the help mates, waiting for the original airfilter.

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