Fact is, I always factor in that nine times out of ten, it's my fault... something I did badly or didn't do at all.. like replace that jelatenuos fuel line, do the carb kit that I knew I needed, find that vac leak, etc. If the saw doesn't run properly, it's pretty likely that I'm kicking myself for being lax on maintenance... a sin which I commit more than I like to admit... hence, the saw behind the seat of the truck.
I did beat up my car once... but that was back in high school.... and it was still my fault... corroded battery terminals. Felt good, though.