The 100 is a million times easier than the 450, if you can do the valves on that you'll have no problems. Firstm set it to TDC and line up all the marks. Then, pull the head cover and loosen the nut on both of the valve tappets. Unscrew the adjuster and when you get the intake to .002 and exhaust to .003 clearance (I think thats what it is), then hold the adjuster with needle nose pliers and tighten the nut back up. Re-check clearances, button everything back up, and if it starts up then you did alright
