Paul,
When I bought mine some years ago, they only made R/C carb versions. There were many forum threads with methods to convert them to control line, and a search on the engine type should find them.
The carb is about what you would expect on a low cost engine, but the engines are pretty good otherwise.
Be warned that the carb screws are not re-useable, so once removed they should be replaced with new screws from any of the good US suppliers. I have plenty left over, and will give some to you at no cost. Mine are marked 2 X 6 mm, and were purchased at Ace Hardware.
Locking the carb open will work for sport flying, but the carb parts move under vibration, and mine changed rpms significantly when the needle was touched.
Bill