I bought a 2009 yz450f used just a few days ago. Owner says it has a JD jet kit in it, but he had the dealer install it and knows nothing about it. Does anyone have a kit with the instructions, so I can see about where I'm sitting. The original owner rode at around 2000', and I will be around 3,500 and higher. I'm going to open up the carb, and see what's in there, but would like to know what the kit recommends. Dr.D full system, all else motor wise is stock. If anyone could help me out, it would be greatly appreciated.... Also, going to check if they did the accelerator pump mod. PS. I searched the stickies, but didn't find much.