2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 84Get this manual
CAMSHAFT TIMINGMETHOD 1
MethodCamshaft Timing with Stator Removed
Crankshaft to Camshaft Centerline Single Plated Link and Dot on Cam Sprocket Sprocket marks aligned with gasket surface at TDC on compression stroke (cam lobes facing downward)