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Hi everyone! I'm new to the forums and the Tamiya Club site. I was way into the Tamiya kits back in the 80's and recently discovered the re-release of the Midnight Pumpkin, the original kit that got me into RC. Hence the screen name. I bought the Black Edition kit a few weeks ago, had a great time building it, ran it around my driveway/back yard and it was fun. But I soon wanted a larger space to run and some fun terrain, so I brought the Pumpkin to a baseball field and park a few blocks away. I ran on some bumpy grass, a few hills and a dusty, dirty baseball field. I ran one battery pack all the way down. I then took about a 5 min break and put in another. I noticed there wasn't as much power and I couldn't pop wheelies. Before I could pop wheelies on demand. I attributed this to the battery having sit and maybe not having a good charge. It was a colder day than I expected so I thought this may have harmed the batteries. The next day I went in the back yard with a fresh pack and noticed that the problem persisted. I see a decrease in speed and definitely not enough power to wheelie from a stop. One thing I also noticed was that the car sounded different. Before I had a high-pitched motor sound at full throttle. Now, it sounds lower pitched. A few things I've checked: Can't hear any gear slippage. Took the motor off and checked the pinion and the gear it touches. I saw no breaks or evidence of an issue or slippage. Nothing obvious anyway. The motor was seated/screwed in tightly. I made sure to re-attach it tightly. No evidence of loose connection between the motor and the ESC. Re-programmed the ESC. Wasn't receiving any faults or beeps of any kind. Did this as precaution. Checked the battery packs with a volt meter. They've shown over 8 volts at full charge. I don't have an ESC to swap out nor do I have another motor. I do have a meter so I was wondering if I should check the wires from the ESC to the motor but I'm not sure what I should see there. I was planning on upgrading to a Sport-Tuned anyway so I ordered one.... So... What are your thoughts here? Anything else I should try? Should I just swap the motor out with the new one when it comes in? Any advice is appreciated. Thanks!