I have (had) the same problems with my ST 45:

Baffle in the muffler came loose and left a rattling noise. Opened the muffler and several washers came out! What a crap! ST-support stated noise is caused by the rapidly expanding hot exhaust gas when it enters the muffler!!! What a BS!

Throttle barrel jammed in flight(!) due to a rough surface of the throttle barrel. Run the engine at full throttle until end of tank and glided the plane in. What a surprise to discover the reason after deinstalling the carb.

Muffler comes loose. Corresponded with ST support and they told me not to use the gasket. Why then do they deliver the part?
Besides, the muffler is way to big for .40 size planes.

Only plus on the ST: Starts reliable, powerful, economic pricing.


TAKE AN O.S. engine!!!!