I was made aware that the yamaha 650 Silverado, Had the potential of filling up with corrossion. Upon taking it out of storage, getting everything checked, running the motor for nearly forty minutes, turning it off to let it cool down, And upon starting it up to finally take that first ride of the year, Fuel began streaming out of the carburator overflow tube. After being told that it was a customer maintenence responsibilty, A possible cost of several hundred dollars to fix, I wrote the president of Yamaha in Japan. After speaking with a member of yamaha USA, I was happy to find Yamaha would honor the maintenence warranty for the repairs. The bike has been in the shop for a week now. They tell me there's a problem getting the carburators into sync. I also found taped to the window of the service department, A nice article concerning Yamaha Motorcycles which have carburators, Of which the fuel additives which our government demands, causes build up within the fuel system and the valves which can cause severe mechanical problems. I am happy that Yamaha is paying to correct this problem on my bike, but I also dislike finding this out after I bought this motorcycle. Yamaha was aware of this problem. Yamaha should have disclosed these potential, Very Expensive problems. I paid to have the valves adjusted when the bike hit six hundred miles. I felt this was wrong because the average rider is incapable of doing this type of rider maintenence, Espically since it requires special tools. I paid to have the extended warranty. Prior to this problem I learned nearly any problems which could come up would not be covered. When buying these motorcycles from Yamaha, The sales person talks up the need to have the extended warranty. Not one time did the salesperson actually point out the true nature of the Yamaha warranty. Even if my bike is fixed without further problems, Will I need to take action which may lead to possible legal consideration should this problem return? How many other people have been forced to pay for repairs of this sort ? If there is a problem with yamaha motorcycles being sold in the United States because of the fuel requirements, Yamaha must either repair any motorcycle which comes down with these problems, Or yamaha should redesign the motorcycle they sell in the U.S. and also come clean to the people who have purchased their products. I further believe that the U.S. Attorney General should investigate this matter and if found negligent, Repay the owners for all the reapir costs they put out in order to ride their motorcycles. Toyota recently got busted for their negligence. I paid alot of hard earned money to get the Yamaha motorcyle I had wanted for such a long time. It's nice to be told that I didn't ride my bike enough so that this problem wouldn't have happened. Thanks Yamaha. Now I'll constantly wonder if the bike will break down on me every time I take it out. I'd appreciate any and all who have dealt with this problem. To those who wish to read about the problem. Yamaha has put out a mechanics repair paper. I found it in my dealers maintence window taped to the glass. Go to your dealer or look on the internet. We bought these motorcycles to give us the enjoyment there designed to do. Don't let them force you to put your motorcycle away because of the cost to correct. Please let me no if you have or had these problems, and.