I add 2oz of 2 cycle engine oil if I start to hear the crickets. This seems to solve the problem for at least a couple of tanks of fuel. I read to do that somewhere else on this forum a while ago, though I'm not sure which post. But I've been doing that and have no problems. I pick up this stuff from walmart:
https://www.walmart.com/ip/Super-Tec...&wl13=&veh=sem