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The motor is very hard starting. I have been using my i/2 electric drill in a tank w/the prop on. You start with full coke and then leave it full until the motor almost dies. Then you push the choke back in until it almost dies. Choke in and out, in and out until it warms up. Maybe a dozen times. Once it is warm it does not run to bad. However you can adjust the idle jet to where it idles real nice, but then when you advance the throttle the motor dies. Or you can adjust the idle jet so it rev’s up nicely with no hesitation, but then it won’t idle. I have used two different carbs, with the same performance results. Oh, and even when the motor is warm, you still have to use the choke to start it. I sure thought this was a dirty/clogged high speed jet, but no amount of cleaning has any benefit. Also, I put new pistons/rings in and my gauge is showing 75lbs per. Not super, but it should run with that.
I got the idea that the silencer might affect the tuning, so I put it on and that was when I noticed the blow back. There is a small hole in front of the silencer and you could put your finger on it and feel the air blowing out of this hole. Maybe about 5psi or there abouts.