How do you check and adjust the timing on a 2004 Yamaha TTr 225?

To check and adjust the timing on a 2004 Yamaha TTR 225, first, remove the left side cover to access the timing chain and flywheel. Rotate the engine to align the timing mark on the flywheel with the mark on the case, ensuring the piston is at top dead center (TDC) on the compression stroke. If the timing needs adjustment, loosen the ignition timing plate bolts and rotate the plate slightly until the desired timing is achieved, then retighten the bolts. Recheck the alignment to confirm the adjustment before reassembling the engine cover.