The problem is fixed but I thought I'd relate the story.
I had the bike apart a while back for a valve clearance check and decided to add a few things like stick coils, LED headlights, better horns, GEN I clutch slave, etc... After finishing and test riding, all was great until a week went by and it started running like garbage just off idle. It would jerk and snatch, sometimes stall, cough and sputter. Even idling was uneven and jumpy, but above three thousand RPM's it ran fine. Plenty of power and the mileage was normal. Thinking that I could have gotten bad gas, I went through the fuel system thoroughly. I pulled the tank, drained and flushed it with known good fuel. No improvement. I pulled the injectors and throttle bodies to clean them to like new condition. No improvement. Synced, checked plugs, wiring, sensors, ran diags - all good. It was a real pain but I decided at that point to go back to the stock ignition and that absolutely fixed it. The resistance readings for the stick coils all checked fine according to manufacturer specs so I could only guess that one or more of them was breaking down at running temperature. The upside is that now it runs smoother and better than it ever did. I suppose all the cleaning and syncing made an improvement. I never thought that ignition coils would cause symptoms like that.
I had the bike apart a while back for a valve clearance check and decided to add a few things like stick coils, LED headlights, better horns, GEN I clutch slave, etc... After finishing and test riding, all was great until a week went by and it started running like garbage just off idle. It would jerk and snatch, sometimes stall, cough and sputter. Even idling was uneven and jumpy, but above three thousand RPM's it ran fine. Plenty of power and the mileage was normal. Thinking that I could have gotten bad gas, I went through the fuel system thoroughly. I pulled the tank, drained and flushed it with known good fuel. No improvement. I pulled the injectors and throttle bodies to clean them to like new condition. No improvement. Synced, checked plugs, wiring, sensors, ran diags - all good. It was a real pain but I decided at that point to go back to the stock ignition and that absolutely fixed it. The resistance readings for the stick coils all checked fine according to manufacturer specs so I could only guess that one or more of them was breaking down at running temperature. The upside is that now it runs smoother and better than it ever did. I suppose all the cleaning and syncing made an improvement. I never thought that ignition coils would cause symptoms like that.
