Went to go for a ride today and sure enough there were problems. Heres the background: The bike has been consuming oil for the past 1000 miles since I did a big bore upgrade. Other than that it has been running fine, and yes i have been super meticulous about keeping a good amount of oil in it. I made sure fuel was flowing, can smell gas out the pipe, and cleaned the air filter. I pulled the plug and it there was a good amount of soft carbon build up around the edge of the plug, but not much on the electrode. I had a spare new plug so i put a fresh one in. The no start issue is like this: turns over freely, nothing sounds bad. It does fire but only while i have the starter button pressed, with full choke, and half throttle. It will sputter the whole time the starter is engaged. Im thinking my valves may have a good amount of carbon on them resulting in a bad seal and low compression. the weird thing is the fact it will fire and run for a second and then die under the conditions i stated above. Im pretty mechanically inclined so im really just looking for a little push in the right direction. I know the rings didnt seat after the big bore upgrade so i have a new set and a gasket set on hand. Pulling the top end off is this weekends project.