I just went thru a long process of doing mods to my bike: 1) New 03 450 exhust cam. 2) New cam chain. 3) Check the valves. After installing the cam and got the timming correct I only rode the bike for about 10min slowly to make sure every thing was turning over smooth and nothing was bound up. It started after 5 kicks.(Saterday) Tuesday I wanted to start it and ride for a bit. Doesn't want to start. I pulled the plug and it was black. So I followed you all's advice and- 4) Carb taken off and cleaned Stock Jetting- Main Jet: 162 Pilot Jet: 42 Starter Jet: 72 5) Exhaust repacked(It was all burned out). 6) New plug Yesterday kicked for about an hr with no luck(started once ran 5sec popped and died) 7) Pulled the tank of and check the valves and this is what i got, working from left to right on the bike(flywheel to kickstarter side) Exhaust Left 0.229mm Right 0.254mm Intake Left 0.152mm Centre 0.152 Right 0.178mm. Will these clearances cause the bike not to start? Thank you for any help.