rinaldi
10-01-2010, 09:22 PM
My son has a 90 DRR that has not really been riden much at all; about 5 hours of use. It was stock and then I jetted the carb and added a Uni filter and Outerwears pre-filter. I installed a 42 pilot and 118 main jet. The spark plug is black and the quad won't start. What size plugs would you recommend? I am picking up a couple more plugs tomorrow and want to get this running if possible this weekend.