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Could be a number of things....but sounds like it might be fuel starvation. Check your fuel filter and maybe replace it. Check and make sure there is fuel flowing to the carb. After that you would have to service the carb.
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Maybe this will help. This is a common problem that I have had with my GV250. Almost the same bike mechanically by Hyosung.
If the battery is low on charge and you are lucky enough for the bike to start. As per normal when first started it revs higher because the bike is cold, this turns the alternator fast to give you the electricity you need to keep the bikes computer working properly. Bike will warm up and revs drop down, alternater not turning as fast, not as much electricity being made. Bike will either stall or rev up and down irradically to try to produce its own electricity. This will occur when the battery charge is low and bike is at low revs, for example when you slow down for traffic or you stop.
If this is your problem. To resolve it when you are out on the road, keep the revs up, twisting your throttle gently when you are going slow or stopped. Give the bike a good long run on the open road to give the battery some charge from the alternator.
Make sure your battery is maintained. If you dont use your bike for a while it will lose charge just sitting there doing nothing. Give the battery a good deep cycle charge or take the bike for a good long open road ride.
hummm check your electrical connections make sure you have the stop run switch is in run position,you have fuel flow to the carb, make sure you are getting spark to the spark plug by using a extra spark plug remove the plug cap and ground it to the head and kick start the engine and see if you are getting spark to the plug. hope this helps
If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..
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