2005 CBR1000RR Knock at Idle
Just took delivery of a 2005 'Blade from an eBay purchase a few days ago. It replaces a 2001 Erion 929 that I sold a couple of years ago and have been missing. The bike has about 8900 miles and is all stock. The bike has the "knock at idle" that's described in several of the threads on this forum over the years. The original owner, who seems to be an honest sort, says it's sounded the same since he took delivery from the dealer, so he guesses it's normal. The local Honda service manager says he "thinks" maybe it sounds abnormal, but he's not sure, and he has no idea concerning the origin of the sound.
Like the other posts, the sound occurs only at idle, it makes no difference whether the clutch is in or out, no difference whether the transmission is in gear or in neutral, and the sound disappears instantly when any load is put on the engine (e.g., holding the brake and beginning clutch engagement or simply beginning to pull away from a stop). The sound isn't entirely constant, it'll "miss a few beats" occasionally, and seems to come and go, but is mostly present. I changed the oil and filter, but that made no difference at all in the sound.
The previous posts on this subject are fairly inconclusive, with most folks rejecting rod knock or cam chain rattle because of the instant disappearance under load. Any new thoughts or research out there? I welcome your comments. (By the way, the 929 didn't make the sound at idle.) Thanks in advance for any help you can offer.