Hello I am just about to break in my engine on a 60 size stick and I have four or five other gassers. So is this cap thing a big problem or we only hearing about it here? I am not running the engine upside down and I have pushed the cap on as far as it will go and it feels like it is on there really well. You know on most of the RC Excel one's you almost have to use a pry bar to get them off. I would like to hear from some people who have not had any problems are they out there. And how many people who are running this engine are having problems please and thank you for your time.