Strange running problem – GV125 C Fuel Starvation [Solved]
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Bike Model = : GV125 C
Hi need suggestions my bike just been brought out of storage, had new brakes and fuel lines fitted. When put away for winter all was fine. Tried for a bit of a run today after picking up and get to 35 to 40 mph and engine starts to run poorly.
Any thoughts greatly received
Regards Nigel
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Go to halfords and get “WYNNS FORMULA GOLD” (dont touch redex whatsoever) , pour the entire bottle inside the tank.
Make sure to drain the OLD fuel first as it has probably gone stale and the carbs inside may have old deposits clogging the jets
Use E5 fuel only and the entire bottle of that Formula Gold , ride as much as you can until you get about 2 bars of fuel drop down, this should allow the Formula Gold to “Soft Clean” the entire fuel system and probably move any debris or old stale fuel varnish inside the jets, we expect the bike to respond better.
Let us know if that improves bit by bit ? then it was the fueling system.
It would be a good time to look at your spark plugs.
If unsure, upload pictures of your spark plugs so we can see the threads and the center cone, we shall know how the fueling is by reading the plugs after a long run (at lower speeds so you don’t stall if the carb still needs cleaning out/ cobwebs blown out!)
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When 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.
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Get a fresh set of CR8E from halfords , those plugs. Do not use “IX Blue Box” iridium plugs as Hyosungs are not keen on them (Hence we use stock ones or LASER type plugs) but i am digressing.
Go for a short ride with new plugs. Come back. Take many pictures. Upload them to this forum so we can see , if its electrical issues we will tell. Also label with plug is front or rear.
If not, upload pictures to GoogleDrive/OneDrive and make a “public” folder called “hyoforums” or something else , paste the share link here , whichever way is easier for you.
I hope also the throttle slides (diaphragms) have not got sticky , if they did, they will cap the speed the bike rolls at . They need to lift fully and smoothly to allow more fuel . the faster you go.
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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
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Nice work Nigel , who would have thought! – Another reason why we sell appropriate sized filters for the GV125 fuel line kits with a good flow rate.
Keep an eye on her and take good care of it, we’re right on the riding season , I can’t wait to take my babies out, after a LONG depressing grey UK winter lol
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