I had my DB30 with stock 97cc engine up to 34mph, then I blew the engine :laugh: but I have yet to get the db30 going with the 3hp Briggs flatty with db carb, K&N air intake, trimmed eyebrows, and port and polish. Hopefully it goes. For pics of what I did to my DB30 stock engine look under bajamini's thread on the 2.8hp engine under this category.