Sputtering Engine! HELP!

[Menace]

I have a GS-B01 .21 engine, when it gets up to temp it starts to sputter at mid-range. It seems O.K. at the bottom end and at the top end, and only starts to sputter after it gets warmed-up. I tried the easy fixes first,new glow plug,clean filter,new fuel line, made sure the fuel tank was sealed good. After all this I could not take the glow starter off without the engine dying!
If anyone has an idea of what the problem is, please help!

Thanks,
Greg

 

[RatzoRC]

Might be the plug your using. also sounds a little rich on the high end needle.
Lean it up on the high end, in 1/8 turn incriments.
Good luck, and welcome to RCNT.

 

[hb1111]

what kind of plug you using?

 

[olds97_lss]

I have the same problem with my Omega 21 Comp engine. It's not bad enough that it dies, but it sounds like it's loading up at half throttle. I'm a crappy driver to begin with, I'll be the first to admit it, but when I go from tons of torque to nothing but gagging to snap your head torque again, it makes for some difficult driving. It's really weird. Some days are worse than others. If I do a quick jab to WOT it's fine, but if I'm easing it up to WOT, it coughes and sputters from about 1/2 to 3/4, then it opens up fine...

I hope you figure it out, I'll try whatever anyone comes up with to fix it.

 

[Menace]

I was running Racers Edge med. plug but switched to McCoy's MC-9 because that is what GS recommends for this engine.

 

[Mach.21]

do you have an air leak