Excellent oil for the 2 strokes and 4 strokes
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Just purchased a used 2008 Kawasaki Vulcan 900 and noticed my clutch was slipping when I hit the throttle in high gear. I figured the clutch should not be going out at 31K miles. Did some reading to find that the right oil is critical for wet clutches like on this bike. Wet clutches need JASO MA approved oil to work properly. Returned the Walmart shelf brand oil since it was not JASO MA and ordered the Lucas 10w40. Changed the oil and filter and the clutch is much better. I'm hoping that this will go completely go away in a few miles or with the next change. Will stick with Lucas for this bike!
The transmission requires 80 to 90 weight gear oil, shown at this link: http://www.motosport.com/dirtbike/gear-oil