Hey Squid. The GPR will need to have the power valves looked at. They had a problem from 00 to 03. I had the 02 GPR and had a stage 2 kit put on it. Is that 03 fuel injected? I'm not sure on the 02FX. I think it's fuel injected as well, but I believe it has a 2 stroke motor as well. Here is a great link for advice.
http://rivaforums.com/6/ubb.x