One thing that novices may have trouble with, is the feel of how much drag is on a feeler gauge when it is set properly. On this bike, it is slightly awkward to get the feeler gauge in there on the intake side.
The other thing that novices may miss, is to correctly position the crankshaft/camshaft so that the valve being checked is absolutely and completely off the lobe in question and off its lead-in and lead-out ramps. Lobe completely on the opposite side of where the cam follower is. For this engine, it is sufficient if the engine is positioned at TDC on the compression stroke.
Not snugging the locknuts will get you, too. Or not snugging them in a manner that doesn't disturb the adjustment screw setting.
The other thing that novices may miss, is to correctly position the crankshaft/camshaft so that the valve being checked is absolutely and completely off the lobe in question and off its lead-in and lead-out ramps. Lobe completely on the opposite side of where the cam follower is. For this engine, it is sufficient if the engine is positioned at TDC on the compression stroke.
Not snugging the locknuts will get you, too. Or not snugging them in a manner that doesn't disturb the adjustment screw setting.