Hi guys newbie here I have a kx 100 and its leaking oil from the air box on to swing arm area my ratio was right but that maybe my air scew as wrong any know ruffly how far in or out the scew should be, or ideas what to do thank peepz
is the oil you're referring to blacker than black?...if so, then Motorrads' probably right about the silencer to pipe connection....I've had 125s that did exactly the same thing, at that connection, and yes, drip onto the swing-arm.
If your top end is good, sounds like you could go a touch leaner on your jets.
what ratio are you running your pre-mix?....what kind of oil?...what is your current jetting?