This is the Dynamite Mach 2 "Big Red" .28 nitro engine, with a Pull/Spin Start Combo and is intended for use in Monster Truck applications. Dynamite's Mach 2 "Big Red" .28 monster truck engine was engineered for superior torque and durability allowing you to unleash the full potential of your nitro monster truck. With features borrowed from the popular Dynamite Platinum series, "Big Red" is a force to be reckoned with. Not only does the engine boast a 13mm turbo ported crankshaft as well as an ABC 6 port piston and sleeve, it also stands out with its oversized aluminum cooling head with "Big Red" etched on the top of the head. Looking for an affordable, high performance engine for your nitro monster truck, look no further as Dynamite's "Big Red" leaves the competition in the dust. Key Features: 13mm turbo ported crankshaft 2 needle carburetor ABC 6 port piston and sleeve Knife edged connecting rod Pull start/Spin start combo equipped Specifications: Type: 2-Stroke Displacement: .28 Bore: 18.5mm Stroke: 17mm Total Weight: 390g. RPM Range: Up to 34,000 HP: 3.4 Front Bearing Size: 7x19x6 Rear Bearing Size: 13x24x6 Cylinder Type: ABC Starting System: Pull/Spin Start # of Ports: 5+1 Carb Type: 2 Needle Slide Crank Type: SG