OS Engines have released their new OS Speed T1204 .12 engine. Featuring improved torque at medium to low speeds, the throttle response has also been improved. This has been achieved through a newly designed crankshaft with different counter weight shape which has had two tungsten weights installed for improve performance. The cooling head has also been changed to improve cooling, while the button and its o-ring has been modified to prevent dust entering this area. The T1204 is sold separately or as a combo with a TT01 EFRA2672 silencer with EX manifold MT03.