Are these a bit hard to prime? I noticed when starting the 100 before it became one with the earth that it took a bit of spinning with the starter before it popped off. First pop off it ran backwards. Whats funny is I have had it start backward, then pop and run the correct direction. Since I have only ran it up 4 times so far, I dont know if it wasn't starting due to fuel or if the battery on my hotshot was low. I had switched to the panel clip to see the ammeter.