Question about 2003 Hyosung GV 250 Aquila

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How to clean and where can i find the carburetor for GV250

My bike won't start and my friend told me I need to clean carburetor but i don't know where it is

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Has bike been sitting for some time?

Posted on Feb 05, 2010

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2005 Hyosung GV 250 Aquila carburetor tuning


Hi, Sherri if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" you're not getting enough fuel.
1. Close to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
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.
Carburator Theory and Tuning
hyosung gv250 carb balance with 2 bottle manometer
Hyosung Aquila 250 Service Manual
http://www.alpha-sports.com/hyosung_parts.htm
HYOSUNG GV250 User Manual

Nov 18, 2017 | 2005 Hyosung GV 250 Aquila

2 Answers

I have a pocket bike that wont start unless u put gas where the spark plug is and then it will run&idle but once u give it throttle it dies there is no high or low screw there 1 screw &the idle screw


Hi, Anonymous more than likely it's clogged carburetor jets, obstruction in the fuel system or a faulty battery for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Common Reasons Why My Pocket Bike Wont Start
Pocket Bike Won Start Help Quick Fix
What To Do If Your Pocket Bike Won Start or any 2 stroke engine
Pocket Bike Not Starting


Jun 01, 2016 | Motorcycles

1 Answer

2009 hyosung gv250


Hi, Anonymous if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will not idle unless the choke is full on and run poorly then stall, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition and in the future pour in a bottle of fuel stabilizer and injector cleaner for you FI folks at least 2 times a year and before storage.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or more, any readings in the 11 volt range you need to do a proper "LOAD" test on the battery and replace as necessary, you may have 12.5 volts or better but little or zero amps, any readings in the 10 volt range you have a dead cell and the battery needs to be replaced.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove and inspect your air cleaner paper elements that are not oil soaked can be cleaned with a soft brush and low pressure compressed air, oil soaked elements must be replaced. Gause mesh and foam elements can be cleaned by soaking them in a container big enough to completely cover them with a solution of 1 gallon of water and 1 oz. of Dawn dishwashing liquid for small and medium size elements, for monster size double the formula and let soak for at least one hour then rinse with warm water shake off excess and let air dry, "WARNING" do not use compressed air as this will embed micro-sized dirt and road grime and destroy the mesh pattern and stretch foam elements out of shape just squeeze it like a sponge and let air dry, use a fan if you're in a hurry. When completely dry spray a very fine mist of air filter oil evenly around the whole element.
6. Remove the carburetors, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Check intake manifold and seals for leaks and cracks.
8. Remove fuel valve and filter disassemble and clean as necessary, remove, clean, and inspect fuel and vacuum lines and replace as necessary.
9. Replace spark plugs with new ones and check for spark.
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.
http://korider.com/index.php?topic=13596.0
Bike won Run without Choke
Hyosung Aquila 250 Service Manual
https://www.alpha-sports.com/Parts/H_GV250.htm
HYOSUNG GV250 User Manual

May 13, 2017 | 2009 Hyosung GV 250

1 Answer

I disconnected the battery on my Mojito for 6 months and went overseas. On my return i re-connected it but it refused to start. I have since taken the battery to a motorbike specialist. They told me it was...


Hi, Alvin if your bike has been idle for months or years and does not want to start you will have to deal with a few remedies:
1. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
2. Remove your air cleaner and clean and re-oil per Mfg. specifications.
3. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
4. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
5. Replace spark plug with a new one and check for spark.
For more information about your question please visit the website below. Good luck and have a nice day.
https://www.tradebit.com/filesharing.php/search/0/2004+aprilia+mojito+custom+150

Oct 11, 2011 | 2004 Aprilia Mojito Custom 150

1 Answer

Got spark but engine wont start


Thank you for the inquiry.
It's great that you got spark that means we don't have electrical issues to trouble shoot. If this bike has been stored for a while or not used over the winter we should probably start out with fresh gas. Gas left in the carburetor for long periods sometimes gets shellacked up and gums up the jets and float valve.
Some trouble shooting steps:
  1. Make sure the fuel shut off valve is in the on position. You can disconnect the fuel line at the carburetor and check for fuel flow. Might be some rust or corrosion at the bottom of the tank or in the valve obstructing the flow. If so then clean and clear.
  2. Tank vent tube at the top - check for obstructions and blow through to clear and confirm.
  3. First test: Turn the slide stop screw most of way out to get max suction.
  4. Lay bike on it's side until you see fuel overflow (Old Husquvarna starting trick)
  5. Slowly crank the engine through a couple of times with the choke on.
  6. Bring start lever up on the compression stroke then kick through real hard. Should pop.
  7. If won't pop or fire we will have to remove and open the carburetor and clean the pilot jet with a pipe cleaner and blow through it, clean and check the main jet, make sure the float valve is opening and allowing fuel into the bowl. Re-attache fuel line and open fuel shut off to confirm flow is coming through the float valve.
  8. Re-assemble the carburetor and install. Note- Good idea to install new gaskets to ensure max suction and no air leaks.
  9. Repeat the start procedure from step 3.
  10. Once bike starts and warms up turn the choke off and run the slide stop screw back in until it idles properly.
If you have other questions just reply to the comment section and we can do some other trouble shooting or make recommendations.
Best regards,
TF

Jun 03, 2011 | 2005 Suzuki DRZ 110

1 Answer

I'm buying my friend's Goldwing 1200, 1986 FI. Bike has been garaged for 4yrs and I tried to start it with new battery but won't start but it cranks, has gas.


Check the kill switch rock it back and forth to be sure it is making contact. Open it up and spray it with contact cleaner that is safe for plastics available at radio shack. After sitting for four years I would start with the fuel system. New filter and NEW GAS and check the fuel lines for cracks and leaks. I have seen bikes that sat for 6 months and needing the carburetors cleaned and reset.

May 20, 2011 | 1986 Honda GL 1200 Aspencade Gold Wing

3 Answers

2002 Hyosung GV250 running problems


Time for carb cleaning , blow the jets with compressed air,check the float level.
Check the spark plug and replace if neccessary.
Check the air filter too, and if you don't have an 'inline' filter for your fuel line,install one.
Basically yr bike's engine needs a tune up...check the valve clearance too!
Hope this helps!

Oct 30, 2009 | 2002 Hyosung GV 250 Aquila

3 Answers

Gv 250 wont stay running


read my solutions on this site for clogged carbs.....Tim

Jun 01, 2009 | 2002 Hyosung GV 250 Aquila

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