Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I had the intention of saving money to purchase one of these engines but seeing the problems that people have
had with them has changed my mind. They seem very troublesome. Are they really as unreliable as they have been
described? My M90 is ok, but are these engines ( M91) worth the trouble? Was the development of the M91 rushed to put it
on the market before the design was ready? 

Paul .