Originally Posted by black798

There is a 17 mm plug that comes out of the left hand crankcase. Take the recoil starter off and then look straight on at the starter cup. It is under the exhaust pipe. Then use a little mirror (like one from a dentist) to find and line up the line that has a T next to it with an arrow that is located closer to the piston. Sorry if that is confusing, i can take some pictures if you need. Anyway, once you find TDC i would make a small timing mark on the starter cup that will line up with one on the case. That's what i did to mine. Makes it so you can be in and out to adjust in under half an hr.
I set my intake lash to .04mm

Originally Posted by JustRandy

There are lots of things it could be, I was just pointing out a common problem.

To find TDC (top dead center), you take the intake inspection cap off and pull the spark plug out. Then pull the rope until you see the intake valve rocker go down and back up. Then stick a screwdriver in the spark plug hole and use it to touch the piston. Continue to pull the rope while feeling the piston rise. Stop when it gets to the top. You may have to go around a couple times to stop on the exact top. Now you set the valve lash on both valves. .001-.003 on the intake and .003-.005 on the exhaust. Try not to scratch anything with the screwdriver. A chop stick or piece of wood would be better, but screwdrivers are handy.

Originally Posted by TannerP15

Thanks if you could take some pics it would be great cause that is confusing

Originally Posted by TannerP15

Thanks that will help alot. are the measurments for the lashes in metric or standard?