So i've never quite worked on a four stroke before. But with some advice from Grayracer....i tackled it myself due to my cooling system getting pressurized and likely needing a head gasket (it was overflowing and spewing out rad cap (i got a new rad cap too).. I took his advice and bought some feeler gauges and measured the clearance of valves before removal. -I dont see any obvious spots where the headgasket is blown, unlike when i worked on two strokes, it was pretty evident. -Upon putting the piston top dead center (according to flywheel i'm guessing its the middle line on it as i see three lines). i looked at the cams, and the dots on cams gears, weren't even remotely close to the edge of the head. When i lined the dots on the cam gears with the head.....my flywheel is almost on the 3rd line...but a little past? The bike ran really strong and pulled really hard. (two pics included to show you) -Another thing that kinda freaked me out, but my buddy said its normal (its from heat treatments?).....the crank, near the main rod bearing, was discolored....i always remember this being a very bad sign on my old kx125. lol. Is this in fact normal discoloration? I have some slight twisting motion on the Rod, near main crank bearing, but no up and down....wristpin has no up and down either. If i remember right, you can have some twist, just no up and down motion I took the cylinder off as well, and i see and feel no ridge in the cylinder.....and i can see some crosshatch still inside cylinder. Head looks pretty clean, no dings, etc in it.