I bought this bike new. Around 7,000 miles it developed a miss and started to smoke when first started. I then took motorcycle to a YAMAHA dealer for the mentioned problems. The dealer notified me that the valves were not closing completely. When I asked why this happened, I was told that it could be due to soft material used to make the valves. After repair was completed, I again asked why my 7,000-mile motorcycle needed a valve job. I was told that during repairs that they checked the valve seats and fond that they were not cut properly. I also had a new problem. My throttle was hard to twist. When I questioned this, the reply was that they had adjusted the cables and would be like that for a little while. WRONG! Had bike back to the same dealer several times for that problem and for it running rich. So rich my wife would not ride or stand behind it. After getting no satisfaction I called YAMAHA, told them about my bike needing a valve job at 7,000 miles. I also told them that it was starting to act the same way again. I then asked if they would cover the bill when I took the bike back to the dealer that I purchased it from. I was told that their policy was for me to go back to where it was repaired and at the most that dealer would give me a break on parts and labor since my bike was out of warranty. I asked why they would not back their product. I was told that they want the dealer to fix any problems. Now I had it back to the dealer to fix the throttle several times. And they were not qualified enough to fix it right! I had to buy a shop manual and fix it. The fix was to line up the alignment holes properly. My bike is back at the dealer that I purchased it from. He called and told me that he traced the problem down to 2 things. Rings or valves. I think after 25+ years of owning YAMAHA'S that I am going to switch my brand loyalty to HONDA.