My mother-in-law has an old 19" Lawnboy pusher which someone gave her. She wants ME to "fix it up". I can't seem to get it running (it won't run at speed and then it just stops) and it seems to me that the carb jet and richness control are way out of whack. So I'm wondering just where they should be set. The mower itself seems to have been well taken care of even though it's pretty old. No Lawnboy repair anywhere near here. Any advice?