Thank you to both of you for your replies and info that you shared. I bought this drone because it looked like it would be fairly easy to fly and learn on, and it was on sale at a super low price. The stock motors performance was great until I started having issues with intermittent running on two of them. This unit was refurbished, so I was looking at the worst case senerio, that being if I needed to replace them, I felt from what I have read and tried to find out, that the brushless motors are better quality. So, as long as it doesn't require breaking the bank, and different type motors are available at some what reasonable prices, I want to put something on my unit that will give better service if I could. I only have roughly 20 to 30 minutes of run-time on this unit, and am somewhat disappointed by this. But, it is refurbished also. The price I paid for it, I cant complain much, because this is my first unit, and I am learning. That is why I got this mainly, because I know I am going to crash it, or hit things, so I did not want to put down a ton of money until I learn and get decent at flying. This has been a lifelong dream of mind to have some type of RC aircraft, so I am learning. Thanks for your input. I just want to make a good decision about what to do with it. It is worth repairing, I just don't to spend a fortune to do it. And I am not sure about the durability of these original type motors. If something else would fit on it, it might be better if I could find out what might fit. Sorry for being long-winded, just felt I kinda needed to explain where I am at. This thing flys good when was working correctly. I just need to get it to do this all the time. Thanks again.