I had some unexpected thrills on the trail this weekend that ended abruptly with me making trailside repairs to my chain and sprocket system. At the end of my unexpected flight, my chain was off and double-wrapped around the front sprocket, my rear sprocket was bent (but not permanently broke, I bent it back inline), and my chain guide rubber was stuffed into the guide body. I'm not completely sure of the sequence of events leading to that final state, so I'm pointing the finger at me (*not* the mechanicals of the cycle: loose chain, out-of-align chain etc). What I can say for sure is, during a mid-steep hill climb on a mix of loose scree and embedded football/ basketball sized rocks, I launched up the face of one of those bigger rocks, became airborn (and I was ready for that), and when I came down, I went off the back and watched the cycle doing an endo in front of me. Anyway, today I find myself in need of some parts. While looking for suggestions on a new chain guide, I read about this poor fellow's woe about a failure on his recent model year cycle (he does not say which year) where a chain guide breaks the welds on the bracket welded to the swingarm, that mounts the guide (he calls it a "block"): http://www.thumpertalk.com/topic/1058198-yamaha-wr450-chain-guide/?hl=%2Bchain+%2Bguide#entry11211839 ...and then there's some further talk about checking *your* welds, because of another cycle's failure in the same area, on a brand new cycle of '12 or '13 vintage: http://www.dirtbikeworld.net/forum/showthread.php?t=107173 So, I'm interested in "beefing up" this weld area, and I'm looking for some advice. For those of you who've done this mod, did you just get it re-welded with TIG, or did you also weld in some additional plate metal around it?