i know this has been posted alot but i was i just bought my kdx. Its a 2003. Im not sure whats wrong with it or if there even is something wrong. The bike fouls plugs every 30-40 miles. There is wet spooge coming from the exhaust tip. And when I am in like 1st or 2nd gear (mostly in 1st) and even when its in neutral and i twist the throtte. it seems to start to run rough at a certain point when the rpms get high enough. It happens mostly when im cruising down a trail in like 1st gear and i try to accelerate more it seems to sputter and run funny. This may be just the way they run but i know my dads 76 two stroke doesn't do this. It just keeps revving higher the more you get on the gas. It has plenty of snap and power and never bogs down. I have heard that the kdx runs rich in stock condition. I have read the carb tuning section many times but im not sure if it even needs tuning. I live in RI so i guess im pretty close to sea level and the temp. is usually 60 -90 when i ride.Does it sound like i need to tune it. Oh, and will drilling the airbox give you more air in the mixture at every throttle position. Will this do any additional harm. Sorry its so long but thanx for your help. I love this site it is very helpful.