I think this engine also creates some problems that are unique to itself. I earlier posted that I had several deadsticks at first and these were due to the fact that I was sure that the advertising hype was correct and that I didn't have to make any adjustments outside the "range" that the collar over the high speed needle allows. After bending back the tab and then adjusting, the engine has run well since. If this engine didn't have this feature I would have adjusted it correctly from the get go with no dead sticks and I would have been singing its praises here today.