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.
Displacement: 3.49cc / 0.213 cu.in.
Output: 2.68ps/2.64hp/34,000 r.p.m
Practical RPM Range: 4,000-42,000 r.p.m.
This product was added to our catalog on June 7, 2019
Speaking of overlooked features, something I like about this engine is the ball linkage on the carb slide. It has 2 threaded holes for set screws 180'd apart from one another. I removed the 1 grub screw installed from the factory and replaced it with a 10mm long button head screw and added a 2nd button head screw on the opposite side. Doing this creates an awesome pair of ears to hang a throttle return band on, going from one screw around the intake pipe and back to the other screw. This pulls the throttle very evenly and not at an angle where it might wear the slide abnormally. It's very easy to install and well worth the 3 minutes to do, and I should've done it from the start because at 1 quart in, I had a runaway due to not having a throttle return band equipped when my receiver battery came unplugged. Engine slung a rod, but I replaced the piston & sleeve and got it back together. I'm now at 1.5 gallons and it runs like a champ.
I always preheat to 200F before starting. My tune is still a bit on the rich side for the high speed needle just for safety since I'm just club racing and practicing, and at this level the races are even less dependent on who has the most power and fuel mileage. I run a Novarossi 41020 manifold and 9901 pipe, and I planned to swap around to my shorter 41021 manifold or perhaps to pick up the ProTek 2090 pipe/manifold, but this setup has worked so good right now that I don't feel compelled to change it unless just out of boredom. 5/5 Would recommend this engine to a friend.