Issues with 2nd cylinder on 2011 and 2013 bogging
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Hello. I am having an issue with both my 2011 and 2013 gv250s. Both idle and sound great but once I start riding the second cylinder starts to sound like it’s boggling. There is a sweet spot around 75% throttle where both cylinders on both the Motos run perfectly but once at full throttle the cylinder starts to bog again.
I have replaced ecu’s, injectors, plugs, coils, even on the 2011 even the wiring harness but cannot solve this issue. Can someone help me out?
Thank you!
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Hello 🙂
As you have both EFi bikes , DELPHi system comes early for some countries and later for other countries. I don’t know if you have an older DAEWOO ECU or DELPHI ECU.
In all cases, have you been able to download the service manual from this forum ? There should be a GT250 EFi book which includes GV250 EFi section and follow it’s steps to troubleshoot it’s ECU to get an error code.
If you can get error code out of your ECU, let us know what it says ?
I don’t think the bikes are carby as they stopped in 2008 , but if someone has put carbs on a 2013 bike, i don’t blame them it is much less stressful than fixing an EFi bike. Personally i went the carby route with my GV250 EFi.
However, EFI is okay when it’s working good. While you check for error code, can you yourself or a garage do a quick cylinder compression test ? What is the service history like too ?
It’s a lot of questions I know, but no rush, take your time. You will be going through a process of elimination.
Have a multi meter ready also because even if you have new parts, the service manual has instructions to test the parts for correct OHMS (coils, caps, sensors, etc) or VOLTS (sensors, reg/rec, battery etc,)
You got this!
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The 2011 is EFI and the 2013 is Delphi. And I have compression tested all 4 cylinders and have gotten a reading of between 120-130 each time. I will look up the error codes on the Delphi and get back to you.
In the mean time. The Delphi is in much better condition and I was wonder what would appen if I stripped my 2011 Gv250 of absolutely everything (except the tank, frame and engine) and re-did everything and I mean every, relay, plug, sensor, ECU, I mean everything with 2013 Delphi parts?
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I have not checked valve clearance. I was really hoping to solve this without having to really crack open the block.. I somewhere between novice and amateur.
You can open the valve covers when bike is cold overnight, and see if there is any clearance on each valve head.
It’s like i will spin the crank few times to get to F (front) mark on flywheel then quickly check clearances , repeat again for R (rear mark) on flywheel.
You can still consult the service manual if the clearances are not in spec, it has the explanations on how to set them up right.
Good tip Simon!
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