So on my daughter's 2015 mongoose 300 I uncorked the exhaust and increased the main jet from 108 to 112.5. I removed the airbox lid, and of course it pretty much idles. I give it some fuel, and falls flat on it's face. For those who have removed the lid to the airbox, what did you rejet to pilot jet, slow jet and main jet to? The stock pilot jet is a 38, slow jet is a 60, and main was a 108. Plan is to put a full exhaust on it with K&N filter and outer wear.
