Hey guys, I had my bike worked on at the Honda shop. I took it in to have the valves adjusted and they called back saying the valve guides needed to be machined. They did that then said it needed a new piston and rings. They bored out the clyinder and installed new piston and rings. I drove it home last winter and it was fine on the ride home. Now that it's summer and I've had a chance to try and ride the bike instantly cuts off when I give it the gas. While the choke is on (half way) at idle the bike acts fine (although it does idle a bit high). As soon as I give it any throttle it immidately dies. If I put the choke all the way on and turn the throttle quickly it revs right up but then dies when it tries to come back to idle. When I pull the spark plug it's completely covered in black. There is no smoke, no oil leaks. I don't want to take it back to the dealer after the $800 repair bill I got last time. Does anyone have an idea of what I need to adjust? Shouldn't the bike run leaner now if it has a bigger piston instead of richer?