I've got an 83. It out runs the Honda 85 200m no problem. I've topped it at 45mph. These are based on the Kawasaki Z200 motorcycle. You may want to change that differential oil, who knows how long that's been in there. The differential in the back is nice for yard work, it doesn't tear up the lawn when you turn. When you tilt it on 2 wheels and it's unlocked, the wheel in the air gets all the power. With it's low gear, I've been able to pull everything I've hooked on to it.
I do own a full shop manual. If you need any info, feel free to hit me up. I've posted some pages a while back regarding the electrical and what not from it.
This 83 was my first trike :-D I need to restore it.
I just wanna go fast. If your not first, your last!!
Reproducing the Tecate CDI. Contact me if you need one. I'm most accessible on FaceBook. You can find me on the 1984-1987 Kawasaki Tecate KXT250 Group.