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Feb 25, 2026 at 8:28 PM in reply to: Strange running problem – GV125 C Fuel Starvation [Solved] #22034
Hi Marcel thaks for the help I am currently running a tank of fuel through with Winns Gold cleaner. However while thinking overnight I arrived at the solution which was even easier. It turns out the new fuel filter was a lot bigger than the old one and not filling on demand. This was causing starvation and was confirmed today when I put the old smaller filter back in and all returned to normal.
Many thanks for solutions which I will save for future issues. You may suggest my solution to other users as it is silly but simple to try and not incredibly expensive.
Regards Nigel
Feb 24, 2026 at 11:00 PM in reply to: Strange running problem – GV125 C Fuel Starvation [Solved] #22016When parked up it had a fresh tank of fuel. Fuel line closed and run till carbs were empty. When I started the engine first off before going to get the brakes etc replace, it started with less than 3 turns an a bit of choke and left it running for about 30 minutes so I don’t think the fuel is the issue. It feel more like starvation or an electronic misfire.
Just a short update on my speedo problems. I did all the removal and clean up and rebuilt using good old lithium grease. All went back together OK and went for a test ride. Part way along the road speedo lept to the top of the clock and imediately zeroed never to work again. Sadly a combination of house moves that never happened and winter got in the way. Poor bike got layed up and a mighty search began for the wheel rotor, ending with a global ebay search which showed only 1 preowned for the same model year from Leicester. Shortly after in January I did move house but the weather gods had their fun and things stood still. I managed to source a complete set of brand new clocks from Korea. Just last weekend did a full service and oil change, took the speedo off the new set and fitted it onto the old kit, and nothing happened. After much swearing I removed the complete set of clocks put the new speedo back onto the new set, wired it all up fired up the engine and ran it around my yard, presto speedo back in action. It seems that the fuel guage/mileometer is also a computer that converts the analogue signal from the rotor to a charge that operates the speedo. That was the part that failed. Only issue I have is my bike only reads 14 miles on the clock and just a tad over 6000 on the defunct set. Phototaken for mr MOT man to show milage on the old set
Many thanks Marcel will pull it all apart give it a clean up, re-lube .dry off the wires and plug and see how it goes. Any trouble and I will give a shout out.
Regards
Nigel
one place I have used for spares HYOSUNGSOURCE Mainly for parts not available in the club shop
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