This is the O.S. 21XZ-B V-Spec Off-Road Competition Buggy Engine. The 21XZ-B delivers top-of-the-line, affordable, competition-caliber performance and is much more affordable than you might expect. If you like the power of the 21VZ-B V-Spec, the 21XZ-B provides users with improved torque and acceleration. The 21XZ-B features an improved 21J2 three needle carburetor with a 7mm venturi for fine tuned control, while retaining the easy to tune characteristics that OS engines are known for. The 21XZ-B also features a stronger crankcase and weighs less than the previous VZ-B, for improved durability and a lower center of gravity.
Features:
- Re-designed 21J2 three-needle carburetor
- 7mm venturi for fine-tuned control
- Improved fuel mileage
- Stronger crankcase
- ABC piston and liner construction
Specifications:
Displacement: 3.5cc (0.21 cu in)
Bore: 16.3mm (0.6 in)
Stroke: 16.8mm (0.7 in)
Output: 2.5hp @ 33,000 rpm
Practical RPM: 4,000-40,000
Weight: 12.52 oz (362g)
Includes:
- 21J2 carburetor
- P3 glow plug
- 7mm carb restrictor
- Exhaust seal and dust cap set
Recommended Mufflers and Accessories:
This product was added to our catalog on November 5, 2010
Después de despegarlo con toda calma, 5 tanques quieto, y como ocho luego cerrando la aguja de altas de a una hora por cada tanque, empezó a despertar..... tiene todo, pique, fondo y sobre todo, cuando queda en mínimas se siente mejor que todos los motores que he tenido. Lo tengo con la pipa 2060 y de verdad que valió la pena la inversión. Después de varios años de competencias le había perdido el gusto a usar mi buggy por diversión en otro lugar que no fuera la pista, pero con este combo de verdad que dan ganas de salir a correrlo por ahí y gozarse toda esa potencia
Also 2 cents about it's performance: It's good enougth with right exhaust. 7-8 minutes on tank of fuel in my buggy or it screams and starts overheating.
No more O.S. for me.
Paid attention to do a very good brak in, but this engine is all but reliable.
But the power and speed are very good.
I just couldn't get the idle to be correct. It goes slower and slower as the engine is warming. After 5min, the engine want to stall.
I replaced the front bearing but it didn't last 1 race day...
My friend has the exact same engine and had no problem with it.
I guess mine way made on a friday...