Pinging / Detonation Issue... Common?
I have a 2013 KLR650 with 13,300 miles. I purchased this bike used at 9309 miles. I cleaned the spark arrester at 9839 miles. I changed the oil and filter at 9973 miles. I use Rotella T6 and K&N filters. I'm located in Virginia, USA (mild - humid/subtropical climate).
While commuting between 65 and 70 mph and the engine running between 5k and 6k rpm in 5th gear I'll occasionally hear a crackling type sound when opening the throttle further. I'll have been running a while (at least 20 seconds) at that constant throttle and speed before opening up to hear this sound, and my engine will have long been at temperature during my commute. It only happens occasionally and for a short time when it does. I've never known what ping or detonation would sound like in all the years I've been motoring, but I've heard others say it would sound like BBs rattling around in a cylinder. To me it sounds like tin foil being ripped multiple times in short succession - high pitched, airy, and not necessarily synched with timing gear...
Is this common with KLRs? Has anyone else experienced this?
What could be causing it if the oil has always been changed timely?
The user manual says I should change my plug and adjust the balancer chain tension every 7.5k miles. If not done could either of these be causing the problem?
Ethanol in the fuel gumming up the carb?
I searched but didn't come up with much. The links I found weren't very applicable (I can't post links...):