83 was 1st year of kx5 and it was air cooled.84 air cooled.then 85 was the begin of water cool.i have some 83&84 motor parts but haven't found a bike yet.i'm a young 51 with 2 sons that are trying to change that racing.we use to race the 83,84 in dirt drag and wear out the water cool fellows.that why i'm looking.