Thanks for the tips. I am the only one here who flies glow,so i'm outta luck on the fuel. But the fuel I have isn't that old and I'll have to pick up a new gallon soon anyhow. I flew just a week ago with the same fuel and no problems.
I have spare A3's. I don't have any #8's. This engine has always wanted to fire backwards. I wonder if the hot plug has anything to do with that? I run the A3 in it because that's what the manual recommends.
ORIGINAL: wjvail
When in doubt, try fresh fuel and a new OS #8. If you don't want to buy a new gallon, bum a tank from a bud. The OS A3 may be an OK plug for the engine but since you are having trouble I'd put an 8 in it. There may be other issues but I use these two items as a baseline for trouble shooting. If you rule out old/bad plug and old/wet fuel, you are left with trouble shooting fuel delivery (trash/tank/filter/lines problems), air leaks (needle/carb/head/backplate), etc..
Bill