If it has no spark, either the electronic ignition unit has failed or there is a fault in the kill-switch (engine stop) circuit. Either way it is extremely easy to fix, but you will need a new part if it is the ignition unit. Because it is brand new and there have been some quality problems with the Chinese-built engines, the ignition unit is probably slightly more likely to be the problem.
Having one fault is no reason to expect another, but it does seem the Chinese engines do have some quality problems in several areas. It was probably worse three years ago than it is now - they've probably fixed a lot of the quality control issues by now, but I think yours might have been a fairly early one with the overhead valve engine. However, I hear they tend to run quite nicely when all is well. Please tell us what the fault was when it is found - people here like to stay in touch with what kind of fault is happening to what kind of equipment.
