OK, I need a little advice. Usually, I am more of a rider than a wrench. Because of time constraints, I usually put my bike in the shop whenever there is a problem. however, I thought I would spend this weekend getting familiar with my wr450. It has run great for me, but I want to get familiar with it. So, I practiced removing and replacing the front and rear tires and tubes (good practice). Then I changed the oil and filter (so many bolts!). Lastly, I changed the plug. Didn't need it really, but its good to know how to do things things BEFORE I get stranded out in the middle of the desert. Then I checked the jets on the carb. the guy I bought the bike from last year had already installed the JD jet kit and a zip ty (I think???) fuel screw. I verified that the the 170 main jet was installed and that the blue needle was in the 4th position. (So now I know what you guys are talking about). I am assuming that the stock pilot jet in installed (45?). The bike started and I let it idle for about 15-20 minutes with no problems. Then I started messing with the fuel screw. Now it won't start. What is a good starting poing for the fuel screw. Should I screw it all the way in and then back it out 1 1/2 turns? A little advice would be appreciated.