MikeSell, I am currently working on the 138cc version and the 49cc versions of these Tecumseh engines. Go with electronic ignition on anything larger than 50cc due to kickback. I should have most of my components in late this week and be putting things together next week. My 138 started at 24lbs! I'm down to 8lbs now. My 49 started at 6lbs and is down to 3lbs now with still having to cut the shaft off the back. These engines lend themselves to easy mounting because of the bolt holes on the back of the block. Mufflers will be another story.