1 - Crack the throttle (like a hoon) in 3rd at about 60K/35MPH . If it takes a second for acceleration to catch up - you have worn clutch plates .
2 - Check this post . rear spark plug on right side of motorcycle, forward spark plug on left . You will see a recessed ("23 mm") hex plug . remove spark plug and check for groove in each aluminum tunnel . This will tell you the cam chains are worn and rubbing thru .
3 - If mechanically minded, you can find articles in this forum to replace the Cam chain tensioners - and replace the convex/ concave plates in the clutch - these wear first - otherwise refer previous answer
https://www.vulcandrifterriders.com/forum/index.php/board,124.0.html


.
. 
.
) .