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Author Topic: GV 650 engine dies after 105 kmh  (Read 707 times)

Chips

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GV 650 engine dies after 105 kmh
« on: April 01, 2017, 04:54:01 PM »

I have just bought a GV650,when driving at speeds over 100kmh engine dies and comes to a halt, a few seconds after stationary the engine starts and off you go again until speed over 100kph causes the engine to die again. I replaced the fuel pump with no improvement, carbies cleaned and spark plugs changed. Petlock dismantled and found someone had already been in there and used silicone sealant, I have removed all the sealant and cleaned the diaphram. However I put it back together with the hole in the housing that exits the rear of the tap with the hole in the plastic plate and the hole in the diaphram. When you turn on the engine fuel spurts out of the hole in the tap housing. Can you tell me what orientation the diaphram and plastic plate and housing should be in to make the petlock operate correctly? No info in workshop manual about this!
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Hylife

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Re: GV 650 engine dies after 105 kmh
« Reply #1 on: April 06, 2017, 09:28:19 AM »

download the service manual from here and look at section 4. There are some slight variations with some models having a pump and the tank petcock.
http://www.hyosung.hu/download/pdf/data/service-manual/GV650-carburetor-servicemanual.pdf
For the pump there is only three hoses, one to the tank getting fuel, one to the carbies giving fuel, one to the carbies getting vacuum that opens the fuel flow when the engine is turning..
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Wes

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Re: GV 650 engine dies after 105 kmh
« Reply #2 on: April 07, 2017, 11:29:49 PM »

I am assuming that you have an older 650 since it has carbs. There was a recall on many of the gv650 because the full tank was not venting properly. The gasket was missing a vent hole between the tank and cap. A quick check would be to go for a ride with the gas cap unlocked and see if it stalls out.
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Chips

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Re: GV 650 engine dies after 105 kmh
« Reply #3 on: October 02, 2017, 01:01:20 PM »

My 2008 GV650 Aquila had the very same problem. It was the diaphram in the vacuum operated petcock, it failed on heavy fuel flow at speeds over 100kmh. I cheated and removed the diaphram and sealed the petcock up with gasket sealer making it a free flowing unit, as the carbi is vacuum operated there shouldn't be any worry about flooding into the crank case oil. However I do intend to fit a new petcock when funds permit.
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umop-ǝpisdn

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Re: GV 650 engine dies after 105 kmh
« Reply #4 on: October 02, 2017, 08:34:32 PM »

History says that the petcock is required to stop the engine from hydrolocking and to stock the crank case filling with fuel. Eliminating the petcock is a bad idea. There have been dozens of threads regarding this over the years.
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