
Not long after announcing a ‘World Championship winning edition engine‘ – Novarossi continue the old tradition of announcing the new season’s lineup at the annual toy fair in Nuremberg, Germany – once upon a time the de facto time and place to announce new products and news.
For 2013 Novarossi have the 4 port Keep Off 21-4 & the 7 port Keep Off 21-7XL
Anyway, the engines – both are fitted with the new lightened & lowered ‘evo 2′ type cooling head whilst the 21-4 comes with a ‘Factory Tuned’ crankshaft and the 21-7XL comes fitted with a new reshaped crankshaft that reduces turbulence inside the crankcase, the front was lengthened as well to improve the seal of the engine. The 21-4′s 4 port make up ensures the best compromise between linear power and minimal fuel consumption – the 21-7XL has a patented port positioning which ensures max performance.
Both engines boast Novarossi’s new rear ball bearing as standard – Novarossi say this leads to, “…reducing the inertia of the rotating mass and increasing the engine’s scavenging – These novelties give an increased throttle response and a higer top speed.”
See Novarossi – 21-4 | 21-7XL
