banging sound, under load @ low RPM
1990 KLR 650 36k miles
So I get this kinda scary sounding banging noise from the motor. It happens at low RPM under load, like taking off from a stop in first gear (or second gear even worse). Or I can get it to do it momentarily by stabbing the throttle in neutral. It coincides with ignition / power stroke.
It sounds similar to a rod or main bearing going out.. but I don't believe that is the problem. I recently had the motor apart, cylinder off, and everything looked really good. Rod, main, piston, no play at all. Cylinder walls looked great and measured to spec. Put everything back together, new spark plug, valves re-shimed, and more.. Still doing the banging though. I'm thinking it is a carb or timing problem? Any ideas?
Here is a video I put up, you can hear it when I stab the throttle. Its much louder in person though.