After my 25 mile ride home the other night from work I sat outside my garage for a little while listening to my BA and watching the tach. It sounds to me like one of the cylinders is missing just once about every 3-4 seconds. The tach drops a few hundred RPM just for an instant and then goes back up. Like a few others here my bike idles around 1100 until it warms up and then it seems to like to idle at about 1600 but otherwise it runs great and I haven't noticed any hesitation or power loss when riding.

Any comments or suggestions?

Thanks,

Keith