I'm starting a new thread about the infamous KLX450R chain slap noise, after the TT moderators recently deleted a couple of other useful threads on the subject... I originally posted about this issue, after installing a new TM Designworks chain slider, only to have the chain slap become much louder on my bike. After reading a bunch of old posts from a forum search, and from some more recent discussions with the wise folks here on this forum, there's a few things I've learned... The bike tends to have an inherent issue, where by a resonance occurs in the drive chain at certain speeds and under certain types of loads, which causes the chain to oscillate both vertically and laterally, more than many other models (CRF450 excepted). I've found wear marks on my bike, where the subframe bolts to the mainfarme on the drive chain side, proving the chain is oscillating wildly through the lateral plane from time to time. But I've also noticed a distinct reduction in the chain slap noise, after following the suggestions of some other forum members to slip some innertube rubber under the chain slider, along with some RTV silicone. This suggests the chain is also oscillating wildly through the vertical plane. Also running the chain a little tighter than it should be, has worked to reduce the resonance and chain slap noise for some other forum members. I'd like to encourage other forum users to share their ideas and suggestions in this thread, about fixes they have come up with to stop the chain slap, and the wild chain oscillations which cause it. Please don't offer to sell any homemade solutions you may have come up with, so the mods won't delete yet another useful thread on the subject. Thanks in advance.