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        Xt660R 2004 Co- stock? 
        
 
         Hello frends!
        I have on me 2004 yamaha c1=47. Im not the first owner and not sure this number is from the factory. As i know from this forum normal C1 for the 2004-2006 year is 5-15 for xtx. Is this number same for xtx and xtr?
 ps my bike is full stock.
 Now i tune c1 to 15 and hardly see any difference.
 What would be the optimal c1 for my engine?
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