ProTek RC Samurai S03 3-Port .21 Competition Buggy Engine w/22D Carburetor (Turbo Plug)

Tuned Pipes
$169.99 - ProTek RC 2090 Tuned Exhaust Pipe w/75mm Manifold (Welded Nipple) (addon details...)
Cooling Head
$69.99 - ProTek RC Samurai S03 & R03 LCG Cooling Head (addon details...)
Glow Plugs
$7.99 - ProTek RC O.S. P3 Samurai 321B Turbo Glow Plug (Ultra Hot) (addon details...)
$9.59 - ProTek RC Gold P3 Samurai Turbo Glow Plug (Ultra Hot) (addon details...)
Temp Guns
$39.99 - ProTek RC "TruTemp" Infrared Thermometer (addon details...)
Low Price: $399.99
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The ProTek R/C Samurai S03 3-Port .21 Competition Nitro Engine is the perfect weapon for 1/8 scale buggy applications, where extended run-time is critical. The Samurai S03 delivers a lethal blow with its high mileage 22D "High Efficiency" 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 S03 becomes a formidable opponent with its smooth power band, performance and proven reliability.

The Samurai S03 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 off-road 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 22D "High Efficiency" 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/22D 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
Thursday, Jun 13 2019 (about a year ago)
ProTek RC Samurai S03 3-Port .21 Competition Buggy Engine w/22D Carburetor
I ordered this engine about 5min after it was loaded to the site, recieved it on a Monday and raced it that Tuesday. EBIS break-in performed by me, Flashpoint 30% fuel, OS 2100 pope set, Kyosho MP10 buggy. The engine is clearly more powerful than the Ty2/2101 engine, but not nearly as peaky and insane as the Spec 2 that has the same bore/stroke. Smooth but powerful mid range and great torque out of corners. More drivable than Spec2 but similar feeling over all power due to a more linear powerband. Will update as I get more fuel through it. So far so good!
Verified Owner
Thursday, Jul 2 2020 (5 days ago)
ProTek RC Samurai S03 3-Port .21 Competition Buggy Engine w/22D Carburetor
Will start off by saying the power band is smooth and that's why I purchased another for my buggy! So far so good
Verified Owner
Monday, Apr 6 2020 (3 months ago)
ProTek RC Samurai S03 3-Port .21 Competition Buggy Engine w/22D Carburetor
Bought the S03 with a 2090 pipe and using Byron 30% nitro 11% oil. Running it in a 8ight X elite. This is my first nitro in over 20 years and it made the experience very smooth and easy. I've ran a couple gallons through it now and I'm impressed with it. Lots of low end (and plenty of top), smooth, easy tuning, gas mileage is still improving but getting plenty of time per tank. Good buy.