O wouldn't touch valve adjustment on this thing myself. They make replacing the spark plugs a major pain, jet valve adjustment is 99% worse. I'd much rather have it done and spend a couple hundo. Well worth it. And by the way, whoever feels the same, ask several dealers for a price on valve adjustment alone if you have a few dealers close enough. I did and the difference in prices i got was like 50% different ! One was around $400 and the other around $200.