Hi guys, would appreciate some help please, just got into flying again and just brought a SC25 engine, now the big problem, i cant get it to run on its own for more than a few seconds, the things ive gone throu are endless, tried new glow plugs, still no good, changed fuel pipe,checked tank pressure, been throu the lean and rich settings very finely as per manual and tried my own variations, checked rear crank gasket for leakage, thats fine, checked needle mixture seal,A ok,had the tank out and tried it a bit higher as i thought it was to low,clunck in tank lies correctly on the bottom,even tried more fresh fuel and as all added up to a few seconds of running, now its doing my nut in, but runs fine on high and low revs with the glow egniter on,HELP!