I'm new to the Forum, and pretty new to forums in general. I have a Vekta.5 with an OBR full mod 34 cc engine. I enjoy the Vekta (although it's down right now after a battery box thermal issue) however I would like a bit more speed. I've topped out at about 38 to 39 mph so far (near the end of my first gallon of 24:1 oil mix following Botejell breakin). I'm guessing it will not be much faster at 25:1 or 28:1. So I've started to think about an engine upgrade to OBR 40.8 that was recently announced. But I'm wondering if expensive drivetrain upgrades will be required. If I have to go down that path then it may make more sense (somehow) to go all in for a larger engine (rcmax 55 maybe).