I'm struggling to get my hand crank H running well after sitting all winter (yes, winter is long gone). My usual starting procedure is to barely open the throttle lever and go to full choke. After a couple of pulls on the flywheel, engine starts to run and I let it run for a few seconds on full choke and then back off the choke to full open. Now, if I open the choke past half open, it starts to die and occasionally I get a backfire thru the exhaust. I have new plugs and have removed the carb and cleaned out. I have the idle needle at about 1 1/2 turns and the load needle about 3/4 turn. Any suggestions how to adjust to get back to a nice idle at full open choke and low throttle?