Your oil injector probably broke you can premix the gas with oil 32/1 ratio also it could be your spark plug disconected slightly or is fouled that´s an easy 4 to 6 bucks I have an 82 KD 80 and I just had to change the plug because the old one was fouling also check how old the gas is in the tank and did you check for compression by kicking the kick starter down slowly, if it kicks easily you lost compression if it has some resistance you have good compression and that bike has rotary valves which if it´s that don´t take it to a shop because they´re gonna tell you they can´t help you because they haven´t been around in decades so nowone has any experience with them it could also be your ignition
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