I have owned my auto X for over 10 years, and it has been by far the most reliable machine I have owned, and the most miles put on thus far. Some things to check right off hand: wheel bearings front and rear, I have replaced the rear bearings on my x at least 3 times over the years, especially the sprocket side, and that one is do again. To check them, stand on the pegs like you normally would, and rock the machine side to side, and look at the axle as you do. If there is play as you move it, the rear bearings are likely toast. Also check the front bearing by raising the front wheel off the ground and try to rock the tire side to side, by grabbing it at the top and bottom. Also make sure the chain is adjusted correctly, and that the two tensioners are in good shape. Remove the swingarm bolt while you are at it, and grease it real good, and check the swingarm bearings just like you would the rear axle bearings. Make sure the air filter is clean, the oil is fresh, and you have a good in-line fuel filter installed. If you keep up with the drivetrain maintance, and keep up on the oil changes, the motor is pretty much bullet proof to be honost with you. By looking at your machine, it would look nice with a seat cover, and would handle (turn) a lot better with a tire that was intended to be a front tire. I have used tires like that in the past, and there is no comparing imo. The tire I like best on the front of my 200x is a Kenda Front max, they are pretty cheap compared to others, and cost about 60 dollars.
A good place to buy parts new is denniskirk.com I have bought a lot from them in the past, and their prices are good, and they ship real fast. I have yet to have a problem with them. If the order is over 100 its free shipping, and since you dont live in MN, you wont have to pay tax I dont think. --- Jon.
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes