Thread: 04 YFZ 450 Help

My Cousins 04 YFZ450 Raptor and it runs great but recently started burning oil in larger amounts, and smoking blue heavily, but still running great. There was a good amount of oil coming out of the exhaust. I just took the motor apart to rebuild the top end to replace the piston and rings. But to find it was a 97mm big bore piston kit "ESR" and piston looks great and rings look fine. I dont know if it is just the rings or the valve seals to be replaced.Dont know whether to get a piston ring set for the Eddie sanders piston or put in the stock cylinder and oem parts.

Those quads have plenty of power as it is, you can't go wrong with a stock setup. Sounds like bad rings to me though. But I have only seen bad rings once, and that's what the bike did.

I got the Oem piston rings , piston and gaskets here. All i would need is a cylinder. Your correct oem is great. The piston looks not that old at all.

Oh yeah and one of the exhaust valves was on the tight size.

Yfz raptor. Lol

Sent from god

Good luck man, I hope your problem is solved!