DMC, just saw this and also got your pm. the cubs seem to be a very quick cylinder with very little porting done to them. however, if you are lookin to be able to ride mx and trails i would go for something else. my cubs start makin power around 6000rpm or so id guess and keep pulling forever. this is great for drag setups but its not all that great for the trails. if you are wanting something thats quick yet still be able to trail ride it i would go for some type of woods or mx porting. with a woods or mx port and 33 or 35mm pwk and t5's or rockets, cpi or other youll have a screamin ass motor with more bottom end than what the cubs will have. for the amount you would spend on the cubs alone you can have your cylinders ported, bored etc and buy carbs and possibly new pipes if you want. thats the route i would take if building a motor for a variety of different types of riding.