OS SPEED's off-road racing engine has evolved even further! The 4th generation of the B21 series, the "B2104" is a long-stroke engine that has improved response in the low range, more torque in the middle range as well as consistent idling.
OS SPEED's off-road racing engine has evolved even further! The 4th generation of the B21 series, the "B2104" is a long-stroke engine that has improved response in the low range, more torque in the middle range as well as consistent idling.
