open up the crankcase (A MUST!) check the cam is properly aligned (dots must MATCH at TDC)
make sure valve lifters are properly seated on the cam itself..
while you're there.. reach behind the cam gear and see if you can move the small lever there.
If unsure remove the cam and check twice if everythings moving freely..
reinstall cam (lifters.. dots matching yadda yadda)
check everything inside is clean and as it supposed to be.
If that's done, you can close the side cover back up and call it good.
You will likely have found an issue on your way.. and fixed that of course.. so try to pull the rope..
if you haven't check the head (valve cover removed.. head installed) make sure the rockerarms sit nicely on the pushrods.
and while you're at it.. recheck the valve lash.
Once done, you'll surely have a easy to start engine.
hydrolock (oil or gasoline in the cylinder) will spit at you said fluid if you try to start with the plug removed.. no spilling of fluids.. likely no hydrolocked engine.
(get a piece of cotton rope.. COTTON!) and push a generous amount of said rope through the sparkplug hole...
count to ten and remove the rope again (yes that means hold on to one end
)
carefully to not fry the rope... if there was oil or gas in the cylinder.. it'll now be in your newly soaked rope
'sid
I just ignore him