yes...it could very well be..among other things. its not easy troubleshooting stuff on here without having more specific info. i think the best thing for him to do is to find a flier in his area with some experience who can be there at the field with him.

gysgt6414 gives excellent advice and procedure, of which i forgot to address the low end...cringe...thanks for bailing my butt bro...

the reason i asked for the engine brand is some of the stuff coming out of china these days just do not work no matter how much one has tried to adjust the engine properly...