2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 106Get this manual
ENGINE and the sprocket alignment pin facing upward
Guide in recess
3Disconnect the wire from the cam chain and rotate the engine to align the single (TDCtiming mark (Top Dead Center) on the flywheel with the notch in the timing inspection windowBe sure to use the single TDC mark when installing the camDo not use the advance marksSingle (TDC) Mark Aligned
Cam ChainCamshaft Installation
Install the cam chain over the crankshaft