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Author Topic: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather  (Read 1080 times)

plamen

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Hello, Since I bought my GV250EFI (2010 model) 3 years ago second hand, I have a problem. Engine breaks and starts again without stopping the motorcycle all the time I ride especially in hot weather, but sometimes the motorcycle stops. In cold is ok even after long riding, between 20-25 Celsius the problem starts, at more than 30 is almost impossible to ride it. FI light turns on not immediatelly but after few minutes and only when breaking becomes stronger. The error code is that for fuel pump relay. I changed: fuel pump relay and all other relays, fuel pump, ECU, outside temperature sensor, spark plugs - without any success. The electricity doesn't break. The injectors were cleaned with a common cleaner in the petrol. Actually I bought it for my wife, I have a bigger but she can't ride it in this status, it's dangerous, so I use it for the city for very short distances 3-5 km, more is impossible and very dangerous. The engine starts and works normally and the FI light is off until you go for a ride. I bought it in winter, in cold weather there was no problem, the problem started next summer in a very hot day, but the motorcycle was not overheated, i was driving it on a highway.
The only dealer of Hyosung in Bulgaria can't resolve the problem and I'm sick of calling him. After 3 years I'm very frustrated, the problem gets harder and harder and now it is almost impossible to ride, so much lost time changing components, checking, ride tests morning/day/evening in different temperatures, twice riding (150 km far away) to the hyosung dealer and back with this f.... machine and a lot of stops on highways. Absolutely f... job! I know there were problems with the previous model with overheating of outside fuel pump, but mine is in the fuel tank and also I changed it. Somebody to have an idea? Thank you in advance!!! You may contact me also at: plamen_new@abv.bg I will be gratefull!
« Last Edit: July 29, 2016, 12:42:08 PM by plamen »
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darren79

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Re: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather
« Reply #1 on: July 29, 2016, 01:22:11 PM »

Could it be the battery? They can fail after 3 years. May hold enough charge to start the engine, but could loose voltage at certain revs which affects the FI status of certain sensors. Voltage also relies on the Regulator/Rectifier and/or the Stator which can wear out. Service Manual has procedures on how to check voltages at different points in the charging system.
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plamen

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Re: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather
« Reply #2 on: July 29, 2016, 01:42:41 PM »

OK, I'll check it, but it starts imediately when cold AND why it runs in cold weather but not in hot... For example in the morning is ok but later in the day not. Last summer we made an experiment - drove few days around 800 km with my wife in the country with a white piece of sheet on the black fuel tank - and guess - no problems, the temperatures were sometimes extremelly hot.... maze...
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beachpitcrew

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Re: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather
« Reply #3 on: July 30, 2016, 10:42:47 PM »

Check the spark plug wires and boots. Check the connections at the ignition coils.


« Last Edit: July 30, 2016, 10:44:33 PM by beachpitcrew »
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Cloud

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Re: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather
« Reply #4 on: July 31, 2016, 04:35:49 AM »


It'll be to do with tank temperature, or tank pressure.

When it cuts out again, open the fuel filler cap. Then try riding again.

If that fixes it, the problem is pressure. If not, it's temperature.
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plamen

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Re: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather
« Reply #5 on: August 02, 2016, 12:18:47 PM »

OK, Thanks to everybody who replyed, I'll check all this, but for sure the temperature matters (and may be in combination with the revs - 5000-6000 rpm). Below 18-20 there's no problem. It begins to cut and to break above 20. At 30 is almost impossible to ride - it cuts every second or two, the feeling is as the fuel ends. That's why I first replaced the outside temperature sensor, later the fuel pump and so on. Sometimes the engine stops at all, but starts normally with the starter. The engine starts and works well idling always regardless of temperature.
It has happened many times in a hot day to cuts, but later in the evening or/and in the mountains or/and after a rain to go absolutely normally. That's why I joke with my wife she has a motorcycle only for the winter.
« Last Edit: August 02, 2016, 12:54:33 PM by plamen »
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plamen

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Re: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather
« Reply #6 on: August 09, 2016, 08:58:09 AM »

Surely the problem is related to temperature, not with pressure in the tank.
In cool evening works normally, especially when out of city, but in the city in warm weather at a slow speed and traffic lights is a nightmare.
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beachpitcrew

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Re: Hyosung aquila gv250efi problem - engine breaks in warm/hot weather
« Reply #7 on: August 09, 2016, 05:58:09 PM »

A bad spark plug wire can separate at high temp and so can a bad plug boot. Connection
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