Upgraded and now it won't start

I didn't change anything electrical. Everything ran fine stock. I returned the engine to stock minus the rag joint drive sprocket. I seriously doubt the upgraded drive sprocket is causing the no spark issue. It also doesn't explain why when I coasted to a stop the engine died and I couldn't start it again when it was running fine seconds earlier. It doesn't explain why neither the upgraded or stock CDI are working. Not that I don't appreciate any help. But putting on an expansion chamber and carb should not cause a no spark response. Sluggish power, bogging, performance gains yes. Not the latter.
 
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Well, after replacing the CDI and magneto. I've decided I'm giving up on this engine. I'm well over $2k into this bike and I can't afford to keep throwing parts at it.
 
Just an update. I received my new engine June 3. The engine fired right up with my CDI's that was though to have shot ****. Still not sure what was wrong with the old engine but this next winter should give me plenty of time to tear it down and rebuild. In the mean time I'm going to enjoy the engine that is running.
 
Had a similar problem with a high performance carb upgrade. Bike ran fine with new carb but it was hard as heck to get started sometimes. A few weeks later the bike wouldn't start at all, not even with using starting fluid. Disabled kill switch, no start. Drained out the gas tank and replaced with fresh gas. No start. Swapped out plugs, no start. Swapped out spark plug cable, no start. Swapped out CDI, no start. Swapped out magneto, no start. Took apart and cleaned out new carb, no start. Let the whole thing sit for over a year because I was so frustrated. Swapped back to my old stock carb and the darn thing finally started up again. A week later and she still starts right up again with the stock carb. Go figure.
 
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