I have ran a 450 Honda with no troubles at all. 0w-40 oil in both sides, barley crack the throttle when cold, 1-3 kicks every time. (PUMP GAS ONLY! RACE GAS MAKES THEM IMPOSSIBLE TO START!) Mine sleep outside when we are out west and it caused us a lot of grief until I figured these few tricks out. Heck we even pull grip warmer power from a stock mx stator, still no starting problems!
Don't run from the bike you have spent time and money setting up the way you like it! Feel free to pm me or call me if you have any questions, I'm happy to help you get it set up!