Mugen Seiki have introduced a Limited Edition of their Ninja JX21-B04 nitro buggy engine. Compared to the JX21-B04 engine, the JX21-B04 Limited Edition comes pre–run-in meaning minimal preparation time to get them track-ready. The Ninja JX21-B04 engine is available in very limited quantity with two combo sets including the EFRA 2042 or the EFRA 2089 mufflers and manifolds.

See: Mugen Seiki