Upper Engine Rattle - Sounds like pepple boucing around
First time poster, but avid reader. My father gave me his 2001 KLR650 (14K miles) which had been collecting dust for the last 3 to 4 years. I'm by no means a mechanic, but have been able to fix just about anything with the use of youtube videos and forums such as this.
To resurrect the motorcycle from the dead, I re-built the carburetor, replaced the battery, changed the oil, brake fluid, coolant, replaced the the front and rear sprockets, chain, rotors, and brake pads. While I had the motorcycle taken apart I also performed the 22 cent mod and doohickey upgrade.
Everything seems to be running great, except there's a strange rattle coming from what sounds like the upper engine. It's sporadic and happens more regularly at higher speeds. The best way to describe it is it sounds like a pebble bouncing around.
I know diagnosing a sound is very hard without seeing/hearing it yourself, and I feel like I've read every thread about noises, rattles, clings, clangs, clunks etc, but I'm still at a loss.
Here's the interesting thing, the sound only happens when in motion. Even if the motorcycle is OFF. It's definitely speed related, but I find it interesting that the motorcycle doesn't need to be on. In fact, when I rev the motorcycle in neutral, I don't hear it. Even when I raise the rear tire and shift through the gears with my bike in the garage, I can't hear it either. But when I ride the bike with the engine on or off, I hear it...and it can get pretty loud at times. It starts making the rattle after about 15MPH and gets more frequent the faster I go.
I've checked the chain multiple times thinking it's got to be the chain, but it seems to be good. Sprockets and chain are brand new and I'm pretty sure the slack is correct and rear tire is aligned properly. Plus the sound seems to be coming from the upper part of the engine.
So there you have it. That's about everything I know about the rattle and hoping to high heaven someone can identify it based on my super long thread (sorry).
Your help would be greatly appreciated! I posted some picture of her on my profile if you'd like to see the transformation.