purp said:
I've read that I should remove the airbox lid. Why? ... I should grease it up real good too. What else before I take it out? What kind of oil do you use synthetic or not? Any help would be greatly appreciated. Thanks.
The reason the airbox lid is removed is to allow better air flow into the engine. The KDX motor is pretty well corked up with a restrictive air intake, and a restrictive exhaust/silencer. An internal combustion engine is essentially an air pump...air has to get in, and get out to make horsepower. Remove lid, allows more air in, and all the aftermarket pipes and silencers address getting it out. If you are new to the bike and or new to riding, I would say leave it in for a while until you get a feel for the bike with it in first.
synthetic vs dino based oil...boy there is a topic that wont end! I use both...depending on what I can buy most readily at the moment. Lower end (gearbox) generally non sythetic, the two stroke oil I use is synthetic. I would say just be sure to get a good name brand oil, specifically made for motorcycles, and dont worry if synthetic or not (now watch out...there will be a million posts about this hot topic...ignore all of us! :blah: )
Greasing - if you are refering to the air filter...actually it is oiling the filter with filter oil, as blanc mentioned. Some people do grease the part of the filter that seals against the air box as added protection against dust coming in . (i do on my KTM for really dusty conditions)