Hand starting takes a lot more trial and error than electric. If these engines are new to you, make sure that the needle value assemblies are clean if they've been sitting for a while.

Turn needle value all of the way closed. 2 to 2 1/4 turns open to start. Open full throttle, cover intake and turn until fuel is drawn through the line to the carb. Apply glow heat (make sure your amps are good for glow about 4amps) if you are using dry cells 1.2 to 1.5 volts (D-Cell in parallel should use 3 - 4). With the Carb covered, turn until you get a kick (all engines with good glow and fuel will produce a kick unless that have no compression - very warn).

One you have a kick, you should be able to flip (make sure prop is at 8 o'clock, 2 o'clock when compression stroke starts, best for hand start) a couple of times and get a start. If engine roars and stops turn needle valve 1/4 turn open. If flips produce puffs of smoke and no fire, too much fuel 1/4 turn closed.

It is very difficult to hand start an engine with marginal glow power so the glow plug and amps are very important.

P.S. I agree that you should probably be using a 8x6 or possibly a 9x4 on the .19