Though my ten is 21 months old, with 20000km on the clock, and still in warranty, I made the decision to do the 20k service on my own and void the warranty.
        
 
         
         References:
         
        
1. Yamaha Service Manual XT660Z TENERE 2008
         
        
2. Haynes Service & Repair Manual Yamaha XT660Z Tenere 
         
         
         
        
 Jobs performed:
         
        
1. Valve clearance adjustment
         
        
2. Spark plug change
         
        
3. Air filter replacement
         
        
4. Engine oil & oil filter change
         
        
 (Jobs that will be performed later on this year:
        
 5. Lubrication of steering bearings
        
 6. Lubrication of rear suspension relay arm & connecting arm pivoting points)
         
         
         
        
 Spares changed:
         
        
 
         
         
         
         Tools used:
         
        
 
         
         (plus 2 torque wrenches)
         
         
        
1. 
        Firstly, I removed the seat and drained the fuel tank. 
         
         2. Then I removed the fuel tank covers. (The bottom left bolt proved pretty stubborn, and it came out together with its threaded housing/sleeve
         
         
         
        2. Then I removed the fuel tank covers. (The bottom left bolt proved pretty stubborn, and it came out together with its threaded housing/sleeve 
         ).
        ).
 
 
 
 
  
        3. So I used some glue…
 
  
        
 
 4. … and stuck it back inside the plastic bracket..
 
  
        
 
 
 
 5. I removed the tank bracket, washers and collars…
 
  
        
 
 
 
 
 
 
 
 6. …the front bolts (one on each side)… 
 
  
         
         
         
        