rumors are flying about the 650R. Most are very hard to verify.
Here's another: today I was in a bike shop (not a Honda dealer, but they prep XRR's and CRF's for desert racing).
The owner tells me that Honda are currently actively testing XRR type motor in a CRF type frame.
True? Anybody's guess.
I really don't see how that can be true.
1.) the 650R motor has too long of a stroke. If it was in a perimeter frame the fuel capacity would be severely limited (downfall of KLX650R). The motor is so tall that the tank would sit above the frame rails instead of between them.
2.) The XR motor is too long, the cases and transmission would have to be redesigned to stack the shafts to shorten the motor.
3.) The heavy inertia motor would require a completely new starting system. I have thought long and hard about putting a 650R motor into a 450R frame, and the kickstarter location always rears its ugly head. To shorten the kick starter, they would need to really lighten the rotating mass of the crank assembly so a mere mortal could kick it over. Yeah, I know it would have a button, but you would have to start it with the lever sooner or later.
4.) With a flywheel that light, it would hit so hard it literally would rip your arms out of the sockets.
Wait a minute! Number 4 makes me think I need to get busy with a used 650 motor and some chunks of billet aluminum...