My K100LT is producing some kind of knocking at 2k RPM and above. It seems to idle just fine, but when you give it gas, it starts running rough. A couple of times, it only felt sluggish, with less power, and I was able to keep it at 55mph with a bit of extra throttle. But once, I couldn't even get it to 25mph, and there was a knocking feeling I could feel through the handgrips and my knees, as if someone was rapping the engine with a mallet.
- The bike has always been cold-blooded, needing "choke" to start and idle, even at 50 degrees F (10C).
- I did experience a"power cutting in and out" feeling on it twice last year, both times while riding in heavy rain. I had assumed there was a marginal sparkplug wire, but I pulled the plugs yesterday, and I thought they looked OK (on #2, the insulator tip was white on the sides, but black on the end... weird).
- I suspect that my battery may be going south. This morning, it wouldn't start the bike; I put it on 1A charger, and it was reported as "full" within 3 hours (I'd expect it to need the chargr overnight). But I still have this problem immediately after charging the battery.