My HM100 is hard starting when it is the first time. The first cold start take a while even choked once it is warm just a short pull and it fires right up. When it is running it idles fine and has good throttle response. But really hard to get it started the first time after it sets a while. It has a new plug and it has a lot of spark too. It has gas shut off but we turn it on and wait 5 to 10 min before trying to start it. I have had the bowel off and it is clean and we have taken the fuel line off and sprayed carb cleaner. Sprayed carb cleaner into where the jets are too. Thank GOD it has a electric start to get it started the first time. I need to get a battery wired in but thinking of putting in a 340 and I would have to rewire again. As the 340 does not need a battery to run the lights. This is on my TRI-ROD.