Hi ,how do i check engine timing on harley davidson evo,1988

Inspection nut is on left side of engine in case between cyclinders.Right with the motor number boss.Allen head I believe.Take it out,hook up timing light in regular way,just like car.Use good light,expensive one because you need bright light to see mark good.Point light at hole an you'll see slot goes n/s across hole.Move distributer/points plate an slot will move right to left and rpm's will go up/down.Middle of hole is dead on.To right of hole is advance,I believe,rpm's will tell you.You're only talking bout 2 or 3 dregrees.Past center to right to edge of hole is 2 or 3 advance,I think,rpms will increase,not much to it.Good luck.