Axial Racing推出21RR-1引擎，这是一颗21级适合越野车玩家的和疯狂行走玩家使用的引擎，7Port，ABC，轻量化散热顶，独特的双油针化油器，使调教更简单。这款产品属于中级产品，符合大部分玩家要求。
Crankcase
- Precision machined all new crankcase was designed to be lightweight but still maintain strength and durability
- Cross drilled fins around cylinder wall provide better cooling efficiency while reducing weight up high
- Black coated to signify its overall look
Cooling Head
- Perfectly sized to provide proper cooling while lowering the weight
- Cross drilled fins help to further the weight reduction and lower the center of gravity
Button Head
- Fitted with a standard type glow plug button head makes it easier to tune
- Turbo Button head available as an option
Piston/Sleeve/Connecting Rod
- True ABC constructions adds to a longer engine life
- 7 port engine sleeve design aids in the performance and torque of the engine
- Piston and sleeve materials were specifically selected to maintain the proper tolerances throughout the heat cycle range
- Lightweight aluminum connecting rod with brass bushings
Crankshaft
- Precision machined crankshaft has been counterbalanced with brass slugs to provide a smoother running engine and reduce vibrations
- Silicone putty is used on the intake portion to smooth the gas flow and provide better engine performance and response
Carburetor
- All new 2 needle carburetor design makes it easier than ever to tune
- Markings on the idle, low speed needle, and high speed needle makes it easy to make adjustments in 1/16th turn increments
- Fully adjustable fuel valves as well as carburetor linkage makes it easy to install into any platform
- Precision machined aluminum venturis are included to aid in smoother gas flow
- Aluminum venturis also aid in tuning the motor for different tracks and environments to aid in longer run times
Bolt-in replacement engine for any .21+ engine mount
Source: Axial [axialracing.com] | 
