It's not hard. If someone like me can learn, ANYONE can learn.I've seen that, but it seems if I don't have the piston top dead center and the intake valve open I can goof it up?adjusting the valves is simple. there is a sticky in the repair section by me, I explain in detail the easiest , and fastest way to adjust/set valves on most 4-stroke motors.
The ATV in question here is an '08 Rancher electric shift. An '08 Rancher is a 420.
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Pull spark plug.
Pull timing plug on right side of motor (6mm hex IIRC)
Undo rear crank bolt cover (3 10mm bolts)
Put 17mm socket on crank bolt and slowly turn motor over while watching through the hole under the timing plug. Stop when you see a T
Now's when you do Shade's little trick of turning the crank bolt a hair back the other way while watching the valve. If it moves, turn it back until you're on the T again.
Remove gas tank and plastic protector plate, take off valve caps.
Get your feeler gauge and slide it up under the tappet. If it's loose, loosen the locknut and tighten it down a bit with a flathead screwdriver, and then tighten the lock nut. Do same thing on other valve.
Put it back together.
Pulling the tank and plastic crap takes more time than adjusting the valves, and once you do it, you'll know how to do it.
Save you a lot of money over time.