I have a Sullivan high tork starter and if the field battery gets low it struggles to start an OS 40la. I charge it every few weeks and it will start almost anything. I fuel up the plane, and turn it over by hand a couple of times{not priming it, just checking for problems} then move to 1/3 throttle attach ignitor and use the starter to spin it up and draw the fuel an it starts. Less chance of overpriming and breakage. Different things work for different people and I'm deffinatly different.