I have a Q42 which is the forerunner of the US engines. It must be really wet (gas in the cly.) in order to start. Mine has a spring starter and starts first time everytime. The spring starter broke one time and it took me two weeks to get a replacement, I tried I bet 50 times in those 2 weeks to start that engine and never could, put the new spring on, first flip, Varooooooom.