Originally Posted by jesusgatos
How is the 650R engine any different than a DRZ engine? Obviously 250cc's...
But seriously, what makes you think this is such a high performance engine? I'd say all signs point to it being more similar to the older air-cooled XR engines than then newer CRF's (which is what I'd call a race engine).
Different opinions I guess. I don't think this is being productive to the XRR thread so I'd rather let it go.