Where to start. So I sent crank and cam off to Hugh in NC to rephase to 277, and they did great work. I got the Pamco ignition to go with the 277. Once I got it running realized the charging system was shot so decided to upgrade to the PMA. Had the Carbs serviced at a shop near by because I didnt want to deal with Carbs. Now, the Bike was running and I was breaking it in easy. Around 200 miles or so I was on the Highway going about 65-70 and blew the engine. White smoke, horrible noise, so I killed the engine. Turns out I blew a hole in the left piston. Pulled the engine, checked the cylinders and it looked like everything was fine except the small hole in the left piston. (right side still had great compression). Upon my searching for what caused this I found a small pin hole in the carb sync rubber cap on the left side. Seems the extra air into the left cylinder was causing it to run leaner and enough to blow a hole in my piston. The spark plug was also oily on that side. So last week I replaced the piston and gaskets and put the engine back together. Threw it back in the bike and hooked everything up. Set valves according to OEM. tried to time the bike. Its close to the fire mark. I cant get it to run. It pops and cranks and occasionally backfires through the carbs. I had a mechanic over and he cant seem to figure it out either. Although he has never worked with a pamco ignition. I didnt mess with any of the electrical after the piston blew out so Im not sure what happened. I was riding the bike almost every day. Some advice would be greatly appreciated. Has anyone else had this problem after a rephased/ Pamco ignition???