I love my tigre's they all run good, but the last one I got (china made) had been assembled with a piece of shaving between the cone and hub, this caused me to guess my spinner truness, but for $3 in parts, it was a cheap fix to buy a new drive cone and hub. Almost all of them after break-in require a quick prime and only a snap action on the spinner to fire off and run, good reliable engines once you get use to the tuning charicteristics of them.