I have been having an issue with manually starting some of my planes. I can usually get the jets to start without using the autostart. But many of the recips won't fire up unless I use the autostart. I go through all of the start up procedures, make sure there's fuel, the engine is properly primed and the mixture is open. I hit the starter and it cranks for a few seconds and then nothing. I try this several times and it just won't fire. Then I give up and use the autostart and it cranks up immediately. What am I missing here? I also have a couple of planes where the thing won't even crank, like the FSD P-38 and the A2A P-47. They have those centrifugal starters and for some reason I cannot get the thing to spin up and engage.