Ok I got the correct size feeler gauges. I know the clearance specs for my trike which is an 84 200x. I can get the gas tank off. The two caps then come off on the cylinder head. Got the 'T' mark on the flywheel lined up at TDC on compression stroke. Now, my question is when I'm looking in at the valves and rocker arms and such...where the heck do I stick the feeler guage? I hope this doesn't sound stupid, this is the first time that I'll be doing this. I will warm the engine up before checking this too. I can see where to adjust them too but don't want to touch that until I figure at where to stick the feeler gauge. Thanks.