The new 2025 .21 GPX engine has been designed for circuit racing boats with nitro fuel. Features new design Zimmerman disk intake offering increased midrange torque and high RPM, new design GPX piston/liner, black crankcase, Turbo plug head, separate bolt on Carburetor and R/C 3rd channel remote main needle valve.
-  3.0 HP / 35,000 RPM
-  Bore: 16.15 mm
-  Stroke: 17.00 mm
-  Displacement: 3.49 cc