My friends have the Werks TL B7 engine. It is a good engine. Decent bottom end, screams on top. One had problems with their carb sticking. It runs god though. My next engine is going to be the OS V-Spec from ebay at $240 shipped, as I cant pass that deal up. The JX Ninja is $300 and a better engine IMO. Also look at the RB and Novarossi engines, very good quality, second to OS in tuning, adn second to none in longevity. RB is made by Novarossi.