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O.S. .21 TM Monster Truck Engine with Revo/Slayer Manifold

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This is the O.S. Max .21 TM Engine with the Revo Manifold (also fits Traxxas Slayer). This engine will be a direct drop in for the Traxxas 2.5 and 3.3 Revo or the Slayer Pro. The .21 TM will adapt directly to the Traxxas EZ start or pull start systems. The O.S. .21 TM engine is for serious racers and backyard bashers alike that are ready for some major power.

  • Adapts perfectly to the Traxxas E-Z Start or pull-start systems with no modifications
  • Included manifold is specially designed to fit directly onto the Revo
  • Traxxas' clutch assembly bolts right to the crankshaft with no modifications
  • Oversized cooling fins on crankcase helps to keep engine cooler
  • Three needle slide valve carburetor with fins to help cool the fuel as it enters the engine
  • High-performance long reach O.S. LC3 glow plug suitable for off-road applications that require constantly varying speed

Displacement: 0.21 cu in (3.4cc)
Bore: 0.669" (17mm)
Stroke: 0.590" (15mm)
Practical RPM: 3,000 - 35,000 RPM
Output: 1.8 ps / 29,000 RPM
Weight: 8.57oz (243g)

This product was added to our catalog on October 25, 2007.

cody beck
just put this in my jato today bought it off ebay and it is really fast has alot more power then the 3.3 and i cant keep it straight down the road i tried 3 different tires and none of them will hook up with this engine
Felisberto Mendija
Quality, performance, power much better than OE. Easy tune. Does not overpower but enhances and potentiates the overall driving experience on the Revo. Included exhaust manifold and reuse of stock (or aftermarket) clutch assembly make for a easy upgrade. Racing or bashing you can't go wrong with this drop-in engine.
steve smith
I bought this motor and installed it...I broke it in really slowly and easy...then tuned it in and this engine pushes my revo to its limits , over the limits lot of times.. this engine is very quick and fast..once I got it tuned in I have ran it for 3/4 gallons of fuel and haven't (had) to adjust it any..two times I could tell it needed to be leaned a hour cause of the heat would have still ran good had I not have tuned it in..never ever have to set Lo speed needle or idle holds its tune as well as a few of my hi end Italian engines bb's also... They cost more than the 3.3 but for the ease of tuning and the tremendous amount of power you gain makes it worth it everytime you pull the have no chance of goin wrong..
scott staley
This is a great engine, put it in my revo and have had zero issues. Very easy to tune idles great, screams flat out. Recommend highly.
zach bessette
just got this for my revo 3.3 and its awesome!! Lots more power than the 3.3! Great engine!!

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