Hi Jeff,
The PT motors are fine on them if you can get them started. The kickback has nothing to do with how hard you pull, they njust lock up to a dead stop, exactly the same if you try starting one without a blade carrier or a loose one. I have now had a few of these with PT's on them and everyone has been the same with this almighty kickback problem. I am firmly convinced it is a decomp problem, I have no idea why it only occurs on these and I am still trying to find a solution. If yours is working fine that is fantastic, just wish I knew why.