ProTek RC CR21 3-Port .21 Off-Road Engine (Turbo Plug)

ProTek CR21 High Performance .21 1/8 Nitro Club Race Engine The ProTek RC CR21 3-Port .21 Off-Road Engine is a great option for club racing on smaller tracks. With a freshly designed crankshaft and lightweight piston, the CR21 can deliver smooth power and crisp engine response. The engine shares the same bore and stroke as the highly successful ProTek Samurai engines, promoting peak engine performance. These features give budget-conscious racers an engine capable of extreme reliability and performance.The CR21 nitro engine uses a 9-fin cooling head to maintain optimal operating temperatures, and add great looks. The combustion chamber is designed to promote low to medium RPM ranges, perfect for club racing, while still offering high-performance output at high RPM. Internally, the engine uses a chamfered "Knife-Edge" connecting rod that reduces reciprocating mass and increases peak RPM. The J3-1 carburetor allows for precise tuning via the three adjustable needles. Two carburetor inser