Question about 2012 Hyosung GV 250
I have a Hyosung GV 250 2012 model at 31.000 km. It gets stuck at 7500 rpm. I had gone into a river and the problem started after that. I think I might have broken the CDI unit. Am I right? If so where can I buy a Delphi CDI unit? Those can't be found. @
Hi, Murat engine "BOG" is mainly caused by a rich air and lean fuel condition but it can also be caused by a lean air and rich fuel condition this situation rarely occurs and is only caused by the misinformed weekend warrior that owns a toolbox. If the bike has been sitting for months or years you will have to completely disassemble the carburetor and submerge the parts (except rubber parts) in "Carburetor Dip" It usually comes in a gallon bucket with a wire mesh basket that can be purchased at any automotive store. If it is not the above scenario then the following explanation will apply.
The more you open your throttle the more vacuum you are creating in your carburetor venturi and your intake manifold. When you are operating at higher RPM any unmetered air that leaks into your system can become more obvious.
Unmetered air is the air that is getting into your system after the fuel has been delivered. If you have unmetered air getting into your system between the butterfly/slide of the carburetor and the cylinder head this will create a lean condition.
All of the rubber components of the fuel system like vacuum hoses and intake manifold that you mount the carburetor to are made of rubber. If none of these components has been changed they are more than likely highly degraded and probably cracked in places to allow unwanted-unmetered-contaminated air into the combustion chamber. Check all of your vacuum lines and vacuum plugs for carburetor synchronization. The vacuum plugs are in the head just after the rubber intake manifolds. The petcock has a vacuum line as well as part of the emission system.
1. Check the intake manifold for fissures.
2. Ensure the bands used to tighten the manifolds down on the intake are secure and have not bound up the manifold.
3. Make sure air box fittings are not warped and fit completely over the carburetor.
Your airbox is metering air and is the first step in the process of consuming air and fuel. The system requires the resistance of the air filter in order to get the proper vacuum to "SUCK" the fuel out of the float bowl and create the proper venturi effect.
Improper mounting and sealing of the airbox will create a small lean effect. This might seem like no big deal but you are inviting dust and debris in your engine that is doing slow damage by not having proper fitment. Fix it so you know it's not contributing to your issue. Pick the low-hanging fruit first.
Do not go and start adjusting anything at this point. It ran fine before. There is something wrong with the assembly or a component. Do not adjust your floats. Get it back to where it was. The moment you start tweaking everything is the moment you lose OEM settings which are a must-have for fine-tuning and maximum performance.
Fine-tuning your carburetor and multi carb syncing come at the very end following the proper procedure established by the Carburetor Gods.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Hyosung Aquila 250 Service Manual
Posted on May 15, 2019
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Posted on Jan 02, 2017
Fuel filter for motorbikes are all nearly the same as it connects to a standard rubber pipe.So to summarise you can buy any model that you want but check the size of the connection for the rubber pipe.
Posted on Aug 23, 2009
SOURCE: 2002 alpha twin same as Aquila
yep same bike different years alpha sports and hyosung used to be one company then split in 04 alpha sports became tomberlin and hyosung became hyosung motors usa
Posted on Oct 17, 2009
http://printfu.org/hyosung+gv250+manual 4 BL: Black with Blue tracer BBr : Black with Brown tracer BG: Black with Green tracer BO: Black with Orange tracer BR: Black with Red tracer BW: Black with White tracer BY ...
SERVICE MANUAL 0KB
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4 BL: Black with Blue tracer BBr : Black with Brown tracer BG: Black with Green tracer BO: Black with Orange tracer BR: Black with Red tracer BW: Black with White tracer BY ...
Posted on Sep 06, 2011
This will be either the starter solenoid is faulty or the starter motor needs replacing.Have the solenoid checked before removing the starter motor.
Posted on Mar 22, 2012
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