O.S. #7 Medium Hot for 2-Stroke Engines.
Slightly hotter heat range than the O.S. #8 plug
Newly developed to focus on easier running at low and medium speeds
Ideal for helicopter engines with superior performance around hovering RPM
range-critical for smooth and powerful 3D and F3C type flight
Also great all around plug for most 2-stroke airplane, helicopter and Car
(except turbo head) engines
O.S. #7 Medium Hot with gasket