I am just getting my 66cc Chinese engine running on my mountain bike installation and I have a heck of time on getting it started! Here in Michigan, the temp is now in the 50 degree range so I understand, that starting the engine will take a bit more doing. I tried holding down the carb prime button for about 3 ~ 4 seconds or so and applying full choke. Using this method, I may have to pedal 100 ~ 150 feet or so to get the engine started, sometimes it will not start at all using this method. Then I tried full choke only (at a later time), with similar results. I have even removed the spark plug and used a shot of starting fluid; sometimes this helps, but not always. Once I get the engine running and warmed up, restarts are easy. What do you guys do to get your little engine going and how much effort does it usually take?