RE: hyper 7 - super good ||| hyper .21 not so good
i have a force that did that- tore it down and it still looks fine? checked carb for leaks ext, got it second hand and it was odd from day one.
i have a JPX .21 that maybe has a gallon through it, its a little easy to turn over, but it idles perfect and supplies just a incredible amount of power.
it sounds like tune, richen up your HS so you have a good trail of smoke, then adjust your idle, then richen up your LS so when its warmed up, pinching the line it gives you 2-3 seconds before it dies, re-adjust the idle.
you might have a poor seal on the glow plug or on the head gasket(s) too.