I have the same machine which I don't know why I've put so much money into it but I enjoy fixing it. I've gone through the carburetor completely, bypassed the stator and installed a RM Stator, replaced the CDI box, replaced the Pulse Pick up coil, replaced many seals and replaced front wheel bearings, new sprockets and currently I'm trying to replace my Fan sensor in the radiator which they are not longer available. I have no idea about the side plastic, Ebay is probably your best bet. You need these basic things for the thing to run, Spark, Compression and fuel. I knew nothing about the Polaris ATV when I bought this, had I known a little more I would probably
have passed on this machine.