Keep it original. I had 2 r80gs that had been converted to 1000cc by PO. Never liked it. More noise and vibration. I found out how balanced a 800cc motor is after I bought 2 more STs. It's perfect balance between r65 and r1000. German engineering like Porsche and Mercedes, keep it stock is the best. Go try a r1100 oil head, u will know how much more vibration with just 100 cc more.