Features:
The 21TM adds more power and displacement than the 18TM – and without modification!.
Retrofits into the same mounting pattern, and the Traxxas clutch assembly bolts right on.
The special manifolds adapt perfectly to existing pull-start or EZ-Start™ systems.
Reliable, lightweight and easy to operate – and both include a 3-needle carb for more precise tuning and an LC3 glow plug.

Specifications:
Displacement:3.41 cc
Bore:17.0 mm
Stroke:15.0 mm
Practical rpm: 3000-35,000
Output:1.77 hp/29,000 rpm
Weight:243 g

Included:
11K Carburetor
LC3 Glow plug