You don't need a new motor, and it is not normal for any engine to use oil. Sounds like you need to get a small bore job on the cylinder and replace the piston, as you are getting oil blowing by the rings.
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2000 Yamaha Warrior
The Engine: .040" over Wiseco 10.25:1 piston--Port/Polish--Webcam 84grind--Titanium Valve Springs
The Air: Dynatek CDI--FMF Powerbomb header--HMF Sport Exhaust--K&N Pro Design Intake
Drivetrain: Barnett Clutch--Maxxis Razr2 fronts--ITP Mud Lite 22" rears--13/40 stock gearing--D.I.D. X Ring Chain
The Rest: ASR +2 A-Arms, Inline Fuel Filter, Full skids, shock covers, MSR handlebars, braided stainless brake lines, black painted frame, Powermadd hand guards, DG Bumper
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