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

I just watched one run on YouTube...a gentleman from UK started it at a slow idle and I was surprised it made quite a clacking sound like a rod knock!....as it warmed up and he speed it up a little it did smooth out some....I suspect an evaluation of the flywheel axle bearings and rod bearings would find the culprit...I am sure it could be corrected....it could be this particular engine had a lot of run time wear...this would not keep me from purchase one...I like to do detective work and see if I can refine issues similar to this.