ProTek RC Samurai R03 3-Port .21 Competition Nitro Engine w/22E Carburetor (Turbo Plug)

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ProTek RC Samurai R03 3-Port .21 Competition Nitro Engine w/22E Carburetor
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Price: $399.99
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The ProTek R/C Samurai R03 3-Port .21 Competition Nitro Engine is the perfect weapon for 1/8 scale truggy and large track buggy applications, where an aggressive power band can provide an advantage. The Samurai R03 delivers a lethal blow with its high power 22E carburetor and long stroke configuration. Combine this with a 3-Port sleeve, turbo head button, 9 fin cooling head and rear ceramic bearing, and the R03 becomes a formidable opponent with its power, performance and proven reliability.

The Samurai R03 has been meticulously designed and crafted in Japan by a leading maker of model engines and delivers a versatile package like no other – excellent power delivery, predictable, crisp throttle-response and consistent carburetor settings are all traits every racer needs to stand atop the podium. So remember, when you head out to the battle field, it is better to fight with a Samurai than against one.


  • Superior tunability
  • Low CG 9 fin cooling head  
  • Aggressive power band
  • Ideal for 1/8 truck and large track 1/8 buggy applications
  • 6 & 6.5mm circular venturis
  • Ceramic rear bearing
  • ABC piston and cylinder
  • Ultra hot ProTek P3 turbo glow plug
  • Strengthened black-coated crankcase
  • Utilizes 22E "High Power" Carburetor  
  • Goes Braaaaap!  

Recommended Exhaust:

  • PTK-2090: ProTek R/C 2090 Tuned Pipe w/Manifold 

Recommended Glowplug:

  • PTK-2542: ProTek R/C P3 Turbo Glow Plug (Ultra Hot

3.49cc / 0.213 
Bore: 16.27mm/0.641in. 
Stroke: 16.80mm/0.661in. 
Output: 2.68ps/2.64hp/34,000 r.p.m 
Practical RPM Range: 4,000-42,000 r.p.m. 
Weight: 352g/12.42oz. 


  • (1) R03 Off-Road Buggy Engine w/22E Carburetor
  • (1) "Gold" P3 Turbo Glow Plug (Ultra Hot) 
  • (1) High Temp Exhaust Gasket
  • (1) 6mm "Circular" Aluminum Carburetor Restrictor 
  • (1) 6.5mm "Circular" Aluminum Carburetor Restrictor
  • (3) Dust Caps (3mm, 16mm & 17mm) 
  • (1) Instruction Manual

This product was added to our catalog on June 7, 2019

Verified Owner
Sunday, Feb 28 2021 (about a year ago)
ProTek RC Samurai R03 3-Port .21 Competition Nitro Engine w/22E Carburetor
Looks sexy with black case and black head. Holds a tune and has loads of power. It is a little "punchy", not super linear. I Like the O-ring sealed button. The RO3 and the S03 are the same except for the carb, both motors are also the same as the B2103 S except you get the tall head instead of the LCG. If you are choosing between the B2103 S, S03, or the R03, all are good. You can't go wrong with this motor. On a side note, I bought two, both had notchy bearings since birth, I lost one when a ball from the rear bearing escaped and pretty much destroyed the entire engine in an one expensive afternoon. Stuff happens. I'd buy again.