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Product Description Give your Traxxas T-Maxx a big boost of performance with the 21TM from O.S. It's the perfect drop-in upgrade, since it has a special manifold that adapts perfectly to existing pull-start or EZ-Start systems. Features: Adapts easily to existing pull-start or EZ-Start systems, no mods required Manifold specially designed to fit directly into the T-Maxx Clutch assembly bolts directly onto the crankshaft without modification Oversized crankcase cooling fins for dissipation 11K 3-needle slide valve carburetor High-performance LC3 glow plug Specifications: Displacement: 0.208 cu in (3.41 cc) Bore: 0.669 in (17 mm) Stroke: 0.59 in (15 mm) RPM Range: 3,000-35,000 Output: 1.77 hp @ 29,000 rpm Weight: 8.57 oz (243 g) Includes: 11K carburetor and LC3 glow plug From the Manufacturer This is the O.S. Max 21TM Engine with T-Maxx Manifold. Direct fit for the 2.5 and 3.3 Traxxas T-Maxx monster trucks. TWO YEAR LIMITED WARRANTY.