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The engine is a tuned counter balanced Zongshen 450 engine with a completely new top end that is unseen elsewhere. This has been tested extensively. The Rally is double overhead cam whereas the normal engine is single. This double overhead cam head combined with mapping high performance exhaust and different manifolds increases the performance. This engine revs but it's very smooth and mechanically quiet.
Zongshen make about 2 million engines a year which is significantly more than than other engine manufacturers. Just do a search on YouTube for Zongshen. The technology and their factory is top drawer. Their engines are in a host of other bikes including Fantic, Norton and AJP. They also produce engine parts for Yamaha and Suzuki.
pdlouche
Overuser155208
Where is it made and who's engine is it.