I ride a 07 525 XC-W and the manual recommends Motorex Power Synt 4T (or similar synthetic) with a viscosity of 10W/50 or 5W/40.
KTM!!!
0.75 litres
A KTM 250sx is the worlds fastest 250 2 stroke dirtbike.
KTM
Get a KTM
ktm
The Kawasaki KX series is the best type of bike u r going to find and for the most power for your buy u need a 2 stroke because of the pick up and exceleration of the RMP's
Dirt Rider magazine said that the dirt bike of the year was, KTM 350 SX-F
KTM 300 series ,they are known to be a three stroke .(even know there is no such thing) Because of how low you can lug the bike and the power valve is adjustable so you can tune it to how you ride. The KTM exc/xc/xcw IS the best 2 stroke available. The Husaberg TE 300 is also the best because it is made by KTM (has the exact same motor)
you don't!!
Ktm 125sx
They are quicker and more powerful and are like the Ferrari of the dirt bikes and are built for speed and racing and the Honda is like the Holden and Ford and is a basic dirt bike!