Why isn't my hyosung gt125r dash working?

Question edited for clarity and toss in some CAPS.

Charge the battery up whilst it is still in the bike. If the voltage is lower than 11 volts or so with the engine being drained by the starter, there is not enough power to operate the fuel injection. The battery needs to be 12.4 to 13.2 volts.

https://www.google.com/search?q=2018+Hyosung+GT125R+crank+won%27t+start

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Check for a dead battery or a bad connection at the battery. These battery connections get corroded fast and need attention frequently. After they are clean and re connected they should be coated with grease to prevent corrosion.

must be your battery then Matt, just change your battery

Undo the screws around your dashboard and control dials and lift out the plastic dash. this should leave your dials in place. You now have easy access to your light bulbs. If like most bikes the wire with the bulb going into your tachometer should be encased in a rubber plug. pull this out and change bulb. Should take about 20 minutes to complete job.Good luck

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.

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There isn't enough power to start the bike, everything you described is what happens when a motor uses all the power the battery has available and drains it. the battery will recover a small amount of power after sitting for a bit but it won't be enough to start the bike. change the battery and check the fuses.

check chip type fuse relays

i drive my hyosung at around 70-75mph (gt125r) and ive got around 3500 miles on the clock and havent had any real major problems with my bike