Actually my friend ive known forever and go racing forever has had these things since he was a kid. He told me about the transmission. And yes i dont let it backload at all. It does have hand ports. The previous owner said it made 76hp to the rear tires. But its all here say of course. Dont remember what carbs are on it.
My buddies bike makes 160+hp. And he is the one that i got the swingarm and other misc. stuff from. He always has parts laying around from mild to whatever. If i had $2500 i would just put his 472 trex in my bike and call it done !
pic is his trex.........................
472 T-Rex, Complete motor w/polished Keihins setup for gas, power valves, polished cylinders, polished cases, polished DD lockup cover, polished billet stator cover, polished manifolds, polished T-Rex head. Complete transmission non-override, setup for dunes. Comes with stator & flywheel, complete. $2500