Ok so its a very busy night at work tonight so I thought what better way to constructively use my time than do a little research. Knowing the 690RFR motors are actually 654 (IIRC) and knowing that KTM has made the 690 Enduro a true 690 cc motor I thought - is it possible???
Onto the Boltons KTM parts fisch I go.....
1st - the base gaskets for the RFR bikes and the 2012 Enduro are the same PN (75030035000),
2nd - the head gaskets are the same PN (75030036000),
3rd - timing chains are the same PN (75036013000) B2, 104 links, 07
4th - wrist pins are different PN's but they are both 20mm,
5th - timing pullys are the same PN (75036014000).
Obviously the cylinders are different as are the pistons/rings. Cylinder heads are different as well but I expected that, the RFRs being a higher performance possibly? (But they use the same valves, both intake and exh - same PN's). My reasoning is that if the gaskets are the same PN the water galleries, chain and guide caverties and oil passages should all line up???
This leads me to think that it would be possible to use the 690R "big bore" cylinder and piston on the RFR bikes. Can anyone shoot a big fat hole in my logic? More CC's = more kapow right???