Join Date: Sep 2008
Location: Marion Center, Pennsylvania
Thanked 61 Times in 57 Posts
Rep Power: 103
i have done mine twice and there are no special tools needed. the intake and exhaust valve adjusters have a 12mm (i think) lock nut and the top of the stud is a small square. i'm sure you can buy the correct square socket for doing this, but once the lock nut is loose the adjuster turns very easily, so i just used a small crescent wrench to adjust and then hold the stud while i tightened the lock nut.
i just checked my service manual and the tool Yamaha reccomends is "tappet adjusting tool part # YM-08035, 90890-01311". i'm sure your dealer would be happy to sell you that tool, but i bet it won't be cheap! LOL
'07 660, BLUE!
'09 550 w/EPS, BLUE!
Last edited by Hammer07; 10-02-2009 at 12:09 AM.
Reason: found part #