Do this and you'll see a crankcase shattering in thousand pieces. This is very bad advice to spray a very cold gas like the CO2 when escaping from the can to a hot metallic piece, no matter if it's a engine a body clip or whatever, the sudden cold put a lot of stress on the crankcase.

What suffers from flameouts he just needs to revise their own carb setting because it has a 99.999999999% and incorrect carb setting and/or clutch setting.