I want to start by making it known that this is not a 250r motor, I’m finishing up a Tecate 4 build right now. I know they are a bit more complicating but I’ve have the motor simplified. The power valves are blocked off so essentially it’s like a regular 250 motor without power valves. My cylinder is bored and brings my CC up to almost 300. When it’s sits and idles it vibrates like crazy. Like loosens the motor mount bolt. I’ve checked the counterbalanced and it is timed perfect with the crank. My question is does anyone know a solution to fix this issue as I’m assuming the weight of the bigger piston is throwing it out of balance, has anyone ever heard of this happening on a 2 stroke engine?