I bought a used 2001 Yellow EX 400. I love it. I'm pretty much a maintenance nut when it comes to my toys. Treat 'em right, and they usually return the favor. It came with a Curtis Sparks exhaust system. I have a few questions. I appreciate any and all info you might share with me.


The oil in it appears to be a bluish/green color. It looks really clean. Is this some kind of synthetic? If so, should I stick with synthetic, or is regular Honda GN-4 good oil to use. My buddy gave me a couple gallons of GN-4, I would like to use it up, but would switch to synthetic if it would benefit the quad. So I guess I'm asking which is the best oil to run in it?

I would like a spark arrestor for the exhaust. I ride in some federal land, and they require one. Does anyone know if Curtis Sparks offers one, or another brand that will fit?

Is the CDI rev kit worth the $100, or does it threaten the quads integrity?


I'm sure I'll have more questions soon, thanks for your time.