20 Most Recent 2012 Hyosung GV 250 Questions & Answers

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

2012 Hyosung GV... | Answered on May 15, 2019

try looking at the timing

Hyosung GV 250... | Answered on Sep 13, 2018

sounds like a fuel issue for sure. If you haven't done so I would suggest cleaning out the carbs and re-adjust your floats if needed.

Hyosung GV 250... | Answered on Apr 06, 2017

Hi, Don for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Hyosung, despair not, for a mere zero $ you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
GV250 time chain problem
Hyosung Aquila 250 Service Manual
HYOSUNG GV250 User Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Hyosung GV 250... | Answered on Mar 20, 2017

spark plug wrench

Hyosung GV 250... | Answered on May 28, 2016

Hi, Jawahir and the usual suspects are:
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Discharged battery, needs to be 12.5 volts or better and be able to pass a load test if necessary, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Bank angle sensor tripped and ignition/light key switch not cycled to the "OFF" position and then back to the "ON" position.
5. Faulty starter button/switch.
6. Faulty kickstand or clutch pull in switch/sensor.
7. Security alarm needs a reset.
8. Starter control circuit, relay, or solenoid faulty.
9. Main fuse or circuit breaker may be blown or faulty.
10. Electric starter shaft pinion gear is not engaging or over-running starter clutch slipping.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
gv250 starting problems
2008 Hyosung GV250 Aquila Starting Problem

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Hyosung GV 250... | Answered on May 11, 2016

Hi Larry, for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix or parts inquiry. If necessary transport your vehicle to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your issue. Good luck and have a nice day.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Hyosung GV 250... | Answered on Oct 05, 2015

Under the rear seat. remove front seat and you'll see it aft.

Hyosung GV 250... | Answered on May 21, 2015

check battery connections might be loose.. also check for water in bottom of gas tank. sometimes after bouncing around water is sucked into carbs.

Hyosung GV 250... | Answered on Jul 04, 2014

First, make sure the clutch is adjusted properly. Too much free play at the clutch lever will mean that the clutch is not being fully disengaged with the lever pulled - making it difficult to find neutral. You may also find that changing the engine oil will improve shifting and make it easier to find neutral.

Hyosung GV 250... | Answered on May 06, 2013

the float is still not seating to stop fuel into the cyl also if the peacock is dirty or bad it will let fuel leak when off the tanks are famous for rust which puts juck into the needle with the float not letting it seat it only takes a micro grain to not let it seat i would clean the carb again start with carb cleaner first running it hard spraying to see if it clears , i had the same issue and played with it and it cleared up though now i need a screw that broke where the needle from the rubber pump goes which isnt sold as a part looks like homemade modification action or $400 to $600 for a new carb

Hyosung GV 250... | Answered on Mar 19, 2013

Why don't you make one for it? should no take much effort.

Hyosung GV 250... | Answered on Nov 03, 2012

Possibly called a fuel line.
Many auto shops will sell the hose by the foot 1\4 or 5\16

Hyosung GV 250... | Answered on Jul 17, 2011

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