2005 Yamaha Warrior Engine cooling Problems

“1-my 2005 Yamaha 1700 roadstar silverado has been sputtering and heavy backfiring coming out of the exhaust including flames, 2-the bike has been dying at red lights and at low engine revolutions, I was told by my dealer that Yamaha recognizes they have to short of dipsticks in the oil tank and therefore filling the engines with to much oil and the oil is making the valves stick plus they are installing too weak of valve springs, 3-change valve springs and install new dipstick to lower oil level in tank + run 1 range hotter spark plugs.”

“These are excerpts from the letter that I sent to Yamaha on jan 15th, 2006: the valves began sticking on the engine, resulting in severe power loss and making the bike difficult and dangerous to drive. I transported the bike back to sylacauga on nov 15th, and explained to the service manager the symptoms. I also told him that based on what I had experienced, that I was fairly certain that it was the exhaust valves that were sticking'.. He said that they would take a look at the bike. On december 13th, 29 days later, he called to say that the bike was ready. …”

“I have a '05 midnight just hit 8200 miles on it. Yesterday I was on my way home cruising at about 80 MPH /3k on the tach. I experienced a couple of hesitations and the tach would jump up in RPM. I slowed down a bit and the problem went away. This morning coming into work I was cruising down the freeway again at 80 when it happened again, this time, I though it was popping, hesitating the tach was jumping around and the check engine light was flashing on and off. I was able to slow to 70 /2500 RPM and it went away. But as soon as I would take it back up to 80 it would happen again.”

“The vehicle being described is a 2005 Yamaha road star Warrior (motorcycle) (1) I was riding my motorcycle on I-90 w through south dakota. About 20 miles west of sioux falls the bike began to backfire and jerk violently at 2500 RPM. I eased up on the throttle and slowed down to about 60 MPH (the speed limit was 70 MPH). The bike acted fine as long as I kept going slow, so I decided to try and make it to the Yamaha shop in rapid city. (2) forty miles east of rapid city, the bike engine cut off without warning, causing loss of power in the rear wheel, which caused a drastic decrease in speed. …”

“Engine stalled while driving in traffic. Would not restart/ code 12. Crankshaft position sensor failed. Was repaired under warranty. Dealer retained failed part.”