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TSFRANKLIN

07 WR Owners- Beware of Chain tensions!!!

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I recently bought a 07 WR450F and replace the original chain with a Rental Gold O ring. After the first ride with the new chain I noticed the outer part of the chain was rubbed off. After investigating, I realized the chain was too loose and had been contacting the case saver just above the front sprocket. I was pretty bummed out because it was a new chain. I used my 2-3 finger tension "guide" I use for my 01 Wf250F. Apparently my guide is too loose, though it was on the ~3" finger mark. After looking more, the chain not only was hitting the case guard, it was also hitting the sub frame, and frame. It carved a nice slice into each one... So watch out, I got lucky because when I got the bike I immediately removed the cheap plastic front sprocket guard for easy cleaning, and if I did not notice the gold vanishing, no telling how much damage would have been done. The frame has about a 1/16" grove cut out :applause:

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Not just 07 owners but everyone should be aware of chain tensions. Obviously if the tension is out of speck damage will occur. Thats a no brainer. By the way since they changed the position of the engine for 07 the chain tension specs have changed from prior years. Make sure you check your manual.

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Of course chain maintenance is a no brainier, but my point is that their is a tension difference between the Yamaha bikes, so beware...I want to point out that the Aluminum Frames are squared off so it makes it pretty easy for a chain to cut into versus the steel rounded off sub frame, and frame. Some chains stretch during a ride and with these new frames you will see damage. I am going to make a frame guard for the inside that will hopefully keep the chain off when it does get loose while riding...

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Yea i had to lay my 07 over to get under a tree and rubbed the frame real hard. I too am going to install some kind of guard. Good heads up

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