I just got finished breaking in my TNX and just finished fine tuning it today. Listen to me......Loosen the glow plug just a little to relief the compresion pressure on the engine. The engine is really tight. I blew a 20amp fuse in my electric starter moduale becasue there was so much compresion. If I was somking a 20 amp fuse then just imagine what kind of pressure was on the engine for the engine start motor to draw 20 amps at 7.2 volts. That equals to .36 ohms of resistance..... 0 ohms is considered a dead short. I let the truck idle through its first 1/2 tank of fuel with the glow plug lose and other than blowing out some fuel on the head everything is just perfect. Like I said I just finished fine tuning and this thing runs great. Just keep an eye on the glow plug and once the engine is warmed up a little just tighten back down and you will find out real quick if you are way to rich becasue the engine will die immediatly. I hope this help and trust some of us, we have been there before....
Take care