Originally Posted by
atc007
Your valves are fine. You are paying for mistakes, we must learn from them. You simply need to jet for the new exhaust,,or,,start troubleshooting. How does your plug look? It tells you everything about what is going on inside. If it looks great and choke when warm,chokes you out,,I doubt it,,,,you're good. If choke helps, you're lean. I highly suspect you simply need to clean your carb and or jet. I have seen 50 times over the years,a perfectly running bike goes in the shop,and backs out the door with a completely new/unrelated problem! It is frustrating and needs troubleshooting. A bad CDI,loose ground will do exactly what you are describing. I suspect you very simply have a tiny piece of debris in your carb/or a jetting issue. Your valves are fine.