I had to grind the part of the lip of the pipe where it went on the back of the engine as well as there is a washer with two holes it for the retaining spring and I had to cut about ¼ of it off to miss the pull starter. Nothing hard. If I would have run a none pull starter I would not had to cut anything.

If I had it to do all over again I would get a none pull start engine and get a starter box. The pull starter on this engine is very small being it is a rear exhaust. I have had more problems with the pull starter in half a gallon then I have in all my pull starters in the past 6 years.