I have a 01 WR426 that I bought here about 7 years ago. I was planning to plate it but never did. It ran fine but has been sitting for about 5 years. My son wants to use it so I tried to start it, but the compression is low. I can kick it over without using the compression release. Could one of the valves be hung up in its guide? I thought about trying to pull start it behind a truck. Any suggestions?