2002 Yamaha YZF-R6 "chan" Questions

how do I set the timing and ajust the valvs on my 1980 xs 400 the only way to change the valve timings are to adjust the iming chan=in(by removing or adding links) or to change to a different camshaft

2001 honda elite 80cc set timing chan marks LOOK FOR AN INSPECTION COVER ON THE LH SIDE OF ENGINE, REMOVE COVER, ON TOP OF CYLINDER THERE SHOULD BE ANOTHER COVER, ALSO REMOVE. REMOVE SPARK PLUG, USE A

Why won't my megelli 250 start pot new valves and timing chan but wont start The timing has to be off, recheck timing chain and alignment marks.