How do you setup the timing on a Yamaha timberwolf 250 1994?

ok theres a screw on the motor it by the reverse bar it takes an Alan Wrench un screw that ok look into it spin the cam gear to you see a mark has a T beside it theres a line inside of were unscrewed it line them up ok then you take the chain tensoner off then take off the timing chain theres a line on the gear if u dont see it it on backwards line that mark on the gear with a little line on top of were u took off the cam cover its a little notch ok after that get some on to hold it right there while u put the timing chain on if u did move it a lil its ok it'll still run put ever thing back on and drive it