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    • #3681
      andre martins
      Member
      • Topics: 1
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      Joined:
      Jan 7, 2020
      @boltini
      portugal
      GD250R
      Points: 57

      Hello mates, i’ve installed a new exhaust on my GD250R and now, after minutes of riding I get the FI light on, following the manual it is an injection problem. Why the new exhaust caused this? How can I fix it? ( I also have a BMC Air filter ). Also, I spoke to a racing mechanic who works with this type of engine but he said he doesn’t want to mess with this motorcycle and to talk to the Hyosung Dealer in Portugal to connect the motorcycle to the machine and adjust the injection values. I called the dealer and they say they can’t do that. Tried another mechanic and we think that the BMC Air filter is messing this. Waiting for the original air filter to test.


    • #3682
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Joined:
      Jan 7, 2020
      @mf448kxn6
      North UK
      GTR
      Points: 3,400

      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
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      Joined:
      Jan 7, 2020
      @boltini
      portugal
      GD250R
      Points: 57

      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: 38
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      Jan 7, 2020
      @mf448kxn6
      North UK
      GTR
      Points: 3,400

      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
      Texas ( Not yankee )
      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
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      Joined:
      Jan 7, 2020
      @boltini
      portugal
      GD250R
      Points: 57

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

    • #3912
      andre martins
      Member
      • Topics: 1
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      Joined:
      Jan 7, 2020
      @boltini
      portugal
      GD250R
      Points: 57

      Hello mates, I’m back with updates.

      – Bought an original air filter, unfortunately the problem persisted

      -The bike was disassembled and everything was tested, sensors, clean injection body, tested injector and it was concluded that tps was having problems. The new tps was installed, the bike was mounted, and after riding it one day, the errors of the bike disappeared, so far the FI light disappeared but a problem has worsened, the bike is costing a lot to turn on, just start with the accelerator at the most and there for the second or third try …

      What’s your opinion?

       

    • #3913
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Jan 7, 2020
      @mf448kxn6
      North UK
      GTR
      Points: 3,400

      If the bike uses original filter and exhaust , then its a full stock machine.  Also check lambda/oxygen sensor thats in the pipe too.  If you had a service book next to you, may prompt the dash to display an FI error code that the ecu may tell you what’s the underlying issue ? Also consider to check intake related sensors on it too.

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

    • #3917
      andre martins
      Member
      • Topics: 1
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      Joined:
      Jan 7, 2020
      @boltini
      portugal
      GD250R
      Points: 57

      Checked every sensor, the lambda/oxygen sensor is fine too. My GD 250R is giving me the error 171 – Running Lean. Don’t know what can i do more … all sensors seem to be good, mechanic tested everything with multimeter.

    • #3928
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Joined:
      Jan 7, 2020
      @mf448kxn6
      North UK
      GTR
      Points: 3,400

      check this out:
      https://www.launchtech.co.uk/support/information/dtc-codes-list/
      P0171 must be the fuel system rail as it says “P0171 – Fuel Trim System Lean Bank 1”

      I couldn’t find 171 in the official hyosung service manual,  is that what the dash actually says on the bike ?

      Consider your injector system, throttle bodies in this matter here. I’m not sure how your mechanic checked that.

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

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