I have Proto 1, Proto 2 and Proto 3 engines. Proto 2 is my favorite for the way mine operate in conventional mode. There are two things which I would recommend, based on my experiences. The BCR (battery replacement) is a worthwhile addition, to be installed before even running the engine. The second recommendation: Traction tires. The Proto 2 engines have been around awhile. When I take one out of the box and run it, after awhile the traction tires need replacement..... they dry out and stretch, and then come loose. If your engine is a diesel, easy to change. If your engine is a steam engine, elsewhere on this site are instructions on how to make a "tool" for assisting with the change....made from paper clips!....not too difficult.
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