Hi, couldnt figure out this issue so this is my first experience with this fourm. Just finished building a 49cc chinese bike kit, and wont start. Pops a couple times here and there but nothing lasting. After riding for 50ft spark plug is totally blackened. Figured it was running to rich, even after adjusting c-clip to leanest setting, same issue. Spark works well agains frame, got good fuel in carb, testing with air filter off so gots air. Maybe im just doing something totally wrong, would appreciate any advice.