Hei Nikolay, this is incorrect information. His engine may be fried but nitro did not do it. This engine is not like the other larger Super Tigre engines or the big Moki/Mark engines. This engine loves nitro. I have 3 of these, 2 Italian and one Chinese. All have run 20-30% nitro for many gallons with no problems including contests where reliability is the most important thing. I have run as much as 50% just for fun. This engine increases rpm with every increase in nitro, the idle gets better, midrange cleaner, acceleration better. The OS160FX does not increase rpm much above 15% nitro for contrast.

I am not recommending that everyone run high nitro.

Ithink more nitro will make it less likely the user will fry the engine. Why? Because more nitro makes the correct needle setting more broad, making it easier for inexperienced users to set the needle.