Yeah thanks both for the info. This genny was stored with no prep...other than emptying gas tank carb in my basement (crawlspace) when it acted up during a power outage. Bought a genny with a Honda motor and just slap forgot about the HM100. Decided to get it back running again...figured out the issue it had during the storm... replaced the plastic gas tank (which had just deteriorated and split).. a new carb, ignition coil, plug, air and fuel filter, and indeed it cranks first or second pull but has an irritating '' poof poof'' backfire/miss and taking a plug reading it comes out greasy looking and dark instead of a nice dry tan. Checked valve clearances and its dead on spec Ahh... hindsight is always 20/20. I could kick myself for not putting some oil in the cylinder and turning engine until valves were closed before storing it. I might pull the head and take a peak... worse case I guess I could get it bored out 10 over while I can still find the parts online... that is if the cylinder walls look scored. O well, something for this old man to piddle with. Again.... thanks for the input.