Just got a DB-30 and threw a Harbour Freight 6.5 motor in her. She runs like a dream and the most fun iv had in awhile. I am gonna get a smaller sprocket to reduce the extreme torque it has right now with a 70t. Im thinking like a 50-55t or something like that. Not to sure yet im going to run the numbers and see what i come up with. But i was riding it today and i had the gps in my lap to get a top speed. And with it all stock (meaning nothing done to the motor or gears) running a 12/70 gear setup it maxed at 22.9 mph. That is where the gov. kicked in so i would be curious if it wasnt there what it would do haha. but anyways it is a blast and let me know what you think!!!!