I am here. I agree with what artificial one has posted. unlike the savage k4 motor the STS has pinch and compression. If all you have ever ran is motors that come in RTR vehicles then you have to adj to the new conditions you find in the STS motors. Motors that are made for and come with RTR vehicles are purposely made with less pinch and compression So the person who buys it which is usually a first timer has a better chance of getting thru breakin with no problems, Some of the RTR motors do run well and last quite awhile if breakin is done right. Anyway back to your problems with the STS.
If you plan on trying to run them some more first find out thier condition
if you have had problems getting them to start,and your blowing up roto and pullstarts. your motor must be very rich and flooding when starting. try adj the HSN to 2-1/2 turns out from closed . preheat your motor and then try to start it. with a pullstart grasp the handle underhanded and move close enough to your truck that when you pull your hand hits you in the stomach before it reaches the end of the rope..