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  1. #1
    r33pwrd's Avatar
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    waterbox? 04 VS. 05

    Not sure if anyone has ever noticed but the 04 and 05 have diffrient waterboxes the 05 has a cross type baffle on the inlet and outlet? Any performance diffrience between the two?


  2. #2
    Mongoose's Avatar
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    This info is direct from Yamaha.
    The 05-06 waterbox has an extra baffle, so an extra amount of back pressure, but does produce 1 decibel LESS noise for emissions testing.
    Be extra carefull with fuel octane when running: heads, timing key, and new waterbox. Probably a good time to stick the freeflow in, with that mod to the riva freeflow to get the rpm's back up(Don't know what that mod is, but there is a mod apparently!)

  3. #3
    r33pwrd's Avatar
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    allready have the free floe (on order) so is there a mod you can do to it to get the rpms back? If so anyone done it?

  4. #4
    BadinGPR's Avatar
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    I made my own f/f out of 3" pvc, cut down 2 couplings and added a 3x2 bushing (opened up to 2.5") for back pressure. I am going to try it today.

  5. #5
    ABBOTT's Avatar
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    does it look like this?




  6. #6
    BadinGPR's Avatar
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    I wanted to take some pics of mine but I didn't get a chance. The reducer bushing worked great (or at least so far). I had 60 more rpms than with the original s/s and it seems to have the hole shot of the aluminum f/f. If the 05-06's have an extra baffle in the water box then the bushing may not be needed but for my 01 it definitely helped. Before, when I used the aluminun f/f it dropped my rpm's off by about 70. Now, with the bushing, I have that back plus 15 or 20 more. I just hope I don't blow a hose off since that pvc is a little more slippery.

  7. #7
    ABBOTT's Avatar
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    i put 5200 ( alot ) around all of the connections for that reason. The hose clams alone scared me.

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