Short amount of info: Brand New Thunder Tiger 91 4 stroke..Mounted on a Topflite Thunderbolt goldkit.. Head points down to 7 O'clock position..Tank is a little higher than the spray bar on the carb/intake on purpose to help with fuel draw..Propeller is a MAS "K" series 13X8 with a Flat alum Thin nut against the prop backed up by a Hub Nut (Scale look) Making it a double nut set up...PROBLEM::: hand starting or starter spun, the motor likes to kick the prop off on start up AND ... Dies when glow driver is removed...WAIT ! ! We have tried two NEW "F" type plugs and a Fox Miracle plug in the head.. Three types of fuel...( Wiches brew 4 stroke fuel, Wild Cat 4 stroke 15% and Power master 15% fuel,,, ALL three fresh and new bottles. using large silicone fuel line through and through....This motor started this problem right out of the box. I followed up by doing a break down inspection.. the cam is timed at the right position according to the manufactures info (Straight up key way and dot on cam at the top) I re-set the valve lash which was way off on the exhaust rocker, it had no lash originally...Motor has the choke flange on the intake ( It is recommended for better draw) Tank is a three line set up with muffler pressure to tank... what have you seen or what am I overlooking? Thanks for the help! Terry