Dt125 cuts out when i put in gear

Do you have the kickstand up when you put it in gear? Many bikes have a lockout on the side stand to prevent you riding away with the stand down. Kills the engine instantly when placed in gear with the stand down.

The problem is the side stand cut out switch - it allows you to start the bike to warm it up on the side stand but if you true to ride off with the side stand down the bike will cut out reminding you the stand is down.
If you bike is cutting out when putting it into gear after starting it is definitely the cut out switch - check the side stand there will be a switch around it some where close to were it bolts onto the frame.

It might be a clutch safety switch thats been disabled ?

check the switch on the side stand, the bike is designed so as it cuts off if you select a gear with the stand down,

Might be a problem with your side stand switch, if the bike thinks the stand is down then every time you put it into gear it's going to cut out. Try manually operating the switch. You can also disconnect the side stand switch and connect the wires on the loom side directly together in case the switch itself is faulty and can't close the circuit to allow starting.

The bike could be fitted with a side stand cut off switch. this is to stop the rider driving off with the side stand down. also if the bike is in gear the bike should not start, this is linked to the clutch/gears. AGAIN IT STOPS THE RIDER FIRING UP THE BIKE AND THE NEXT thing he is aware of is his bike either taking off with out him or hitting a wall or car etc.
hope this helps
og

Make sure you have your stand up before you put it in gear. Some bikes have a stand switch that doesnt allow the bike to be in gear while the stand is down. This switch may have been damaged when the bike fell and now be malfunctioning.

hello and welcome
it seems that you may have a faulty side stand switch. the side stand needs to be in the up position before the bike can be started off in gear. but if not the side stand contains a saftety switch that shuts the bike off when put into gear. to verify this you can check for spark when the bike is being turned over in gear with the clutch held in.
there should be two wires associated with this switch. a green, and green with white. so when the stand is up these two wires are connected, and the switch can be tested as such. thank you.

SOUNDS LIKE IT COULD BE THE SAFETY SWITCH FOR THE KICK STAND ,IF THE SWITCH HAS BEEN DAMAGED IT WILL START UP FINE AND WHEN PUT IN TO GEAR AND CLUTCH IS RELEASED IT WILL DIE.(This is a safety feature)

If that don't fix,Please post back

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Does it have a kick stand interlock switch? If so, the stand needs to be up when you select a gear, or it cuts off. If the switch is bad or out of adjustment, it will cut off when put in gear.