Guys, I have a Giant-Vac Leaf loader with a Kohler 16 hp twin OHC. My carbuerator solenoid went out and had to be replaced. To get to this part the easiest way was taking the fly wheel sreen off and the timing belt. We re-installed the timing belt and flywheel as indicated in the Kohler service manual. Now the engine starts, but emits alot of black smoke and won't run full throttle. Could the timing still be off possibly? Any suggestions would be appreciated.