i have a thunder tiger .91 four stroke. I just bought it used. still looks new. Im running omega 15% and a fox miracle plug and a 15x6 k series prop. first issue is. it does not start very easy, seems like its struggling to get enough fuel, it back fires sometimes spins the prop off. 2nd issue when it does start, it just sounds like it is struggling to keep running and when i pull the glow starter off it drops more rpm than i think it should. and when you rev it up i cant even get full throttle and its just like it runs out of fuel. ive had the needles adjusted at every different point there is and it doesnt matter i cant get it to run right no matter what i do. Does anyone know the correct valve adjustment setting. i have a saito .91 and it runs great and this thunder tiger just sounds terrible compared my saito. any tips would be greatly appreciated. im going to mess around with it some more tomorrow and ill post what i come up with. thanks