O.S. Engines: 21XZ-B/Speed, 65AX, and 25FX
New from O.S. Engines: 21XZ-B & 21XZ-B Speed The 21XZ-B engines represent the next level in high-performance engine technology. The 21XZ-B boasts improved fuel mileage, plus a long stroke for superior torque A 21J2 three-needle carb includes a 7 mm restrictor The 21XZ-B Speed has been tuned for championship-caliber performance, with a race-proven 3-port sleeve […]