I've only ridden the bike about 3 hours when it started to idle erratically (it idles high when you blip the throttle, but if you ride slow ,then it comes back down) and the engine would pop when chopping the throttle sometimes killing it. It's been hot, but I don't think it's that. Not overflowing the radiator. I stopped for a couple minutes and then went to start it and the compression was about half of what it should be. I bought the bike brand new and it worked great for about the first 2 hours. Any ideas?