Popular Post TracerNed Posted June 16, 2023 Popular Post Share Posted June 16, 2023 If your CP3 engine has a cough or stutter when running at a constant speed down the highway you may have a bad battery. It took two dealers to figure out my problem. I own a 2021 Yamaha Tracer 9GT that I bought new in September 2021. The engine started running weird in August 2022. It would cough/stutter occasionally (every few minutes) when running at a constant speed down the highway. I had over 10,000 miles on the bike and knew something wasn’t right. In September 2022, I took it to the Yamaha dealer in Iowa City, Iowa. I purchased the bike new from them. Their techs rode it and said there was nothing wrong, the bike ran fine. They didn't fix anything, it cost me $169, and I was not a happy customer. This Spring, same problem. I had ridden the bike another 1000 miles and decided to fix it or trade it. I let McGrath's in Cedar Rapids, Iowa look at it. I explained what the bike was doing to the Service Advisor, he listened to me and had a Smart Mechanic work on it. The Mechanic checked the engine for error codes and found 3. These codes made him suspect the battery was faulty. It checked 12.6V but the voltage output was inconsistent, he said probably due to an intermittent short inside the battery. He said this voltage variation caused the engine computer to behave oddly. He replaced the battery under warranty (I had purchased Yamaha’s YES Warranty) and the bike runs like new. I paid the $182 diagnostic fee, and I'm very happy with the results. This bike is now a keeper!! 12 1 1 Link to comment Share on other sites More sharing options...
tgas Posted June 17, 2023 Share Posted June 17, 2023 Wow that is a strange one. Glad you got it resolved. This good information to know if this happens to someone else. Link to comment Share on other sites More sharing options...
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