Seems to me that XR's stood at the pinacle of four stroke high performance long before it was even fashionable...or at least until they started calling "XL" models "XR's"! Yeah Triumph, and those XR's were air-cooled RFVC engines! The L is closer to a genuine XR than your re-vamped R! Drop the label, look at the motor. Does any other XR have that? It should have its own designation!