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  1. #1

    Join Date
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    Lets talk Camshafts, Why do I see people preferring to use the 2004?

    I see Alot of people doing engine builds mention they are running a cam from an 04. What's better about this cam?

    Comparing part #'s this is what I came up with.

    Code:
    2002-NA          290837621       CAMSHAFT     $586.99      
    2003-NA          420837626       CAMSHAFT     $580.99      
    2003-SC          420837626       CAMSHAFT     $580.99        
    2004-NA          420837621       CAMSHAFT     $586.99
    2004-SC          420837628       CAMSHAFT     $580.99
    2004-SCIC        420837628       CAMSHAFT     $580.99
    2005-NA          420837621       CAMSHAFT     $586.99
    2005-SC          420837629       CAMSHAFT     $580.99
    2005-SCIC        420837629       CAMSHAFT     $580.99
    2006-NA          420837851       CAMSHAFT     $586.99
    2006-SC          420837629       CAMSHAFT     $580.99
    2006-SCIC        420837851       CAMSHAFT     $586.99
    2007-NA          420837851       CAMSHAFT     $586.99 
    2007-SCIC        420837851       CAMSHAFT     $586.99 
    2008-NA          420837851       CAMSHAFT     $586.99  
    2008-SCIC        420837851       CAMSHAFT     $586.99  
    2008-SCIC-X      420837851       CAMSHAFT     $586.99
    So that gives us 6 different Cam's total.
    Code:
    2002's All                             290837621       
    2003's All                             420837626         
    2004-2005 NA                           420837621         
    2004 SC/SCIC                           420837628         
    2005 SC/SCIC & 2006SC                  420837629          
    2006-2008 All                          420837851
    Last edited by boostaholic; 08-22-2008 at 02:01 PM.


  2. #2
    HORSEPOWER JUNKIE 9secZO6's Avatar
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    Belle Chasse, La.
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    I know they are different, but do not know the specifics. I have speculated that the ramp-rates differ more than the actual checking specs, and may have even been done because of the early dropped valves in the 04s before they changed the valve part #. Many things happen to valvetrains at speed, and ANY instability or inability for the rocker to follow the cam lobe at speed is gonna cause problems. If the 04 cams do make more power, and it is not the lift or duration, it will be the ramp rate. If the powerband is fatter, or comes in sooner, it will be the lobe separation. Someone here already knows, wonder if they are gonna post

  3. #3
    Banned User
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    From what I have found out, the 04 cam is basically halfway between a 05+ cam and a Rotax Racing came...

  4. #4
    04/05 cams are the same....better valve control/less float than later years. good valve control to 8600 with retainers

    06/07 cams are the same....ok valve control to 8600 with retainers, redesigned for better emissions

    08- poor valve control over 8400 even with retainers, redesigned for better emissions again.

  5. #5

    Join Date
    Sep 2007
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    Lexington, Ky
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    so let me get this right... with the older cams, there is less a need for the lightened valvetrain because of better valve control?

  6. #6

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    Sep 2007
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    Lexington, Ky
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    So on my X-ski, I could put in an 04 Cam, with my RR8600 ECU, and be fine without the upgraded springs, just the lightened retainers?

    Glad I asked, I may have up to 4 of these Cam's I beleive....
    Last edited by boostaholic; 08-22-2008 at 02:22 PM.

  7. #7
    rxpdoo's Avatar
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    04 cam

    you still need the springs and retainers. i had first hand experience 2 years ago when i dropped a valve at only 8500rpm.

  8. #8
    Quote Originally Posted by boostaholic View Post
    So on my X-ski, I could put in an 04 Cam, with my RR8600 ECU, and be fine without the upgraded springs, just the lightened retainers?

    Glad I asked, I have 4 of these Cam's I beleive....
    yes the RR retainers and shims with the 04 cam will control the valves in your X at 8600. just remember it is critical to drill the oil supply hole in your rocker shaft to 3.5mm(9/64") on the 06 and newer skis

  9. #9
    Is the 04 part # 837 629?

    My 07 is stamped #837 851

    Do these numbers mean anything as to the performance of the cam or simply part numbers?

    Why do the oil gallery's need to be drilled, when using the 04?

    My 07 with smaller holes revs to 8800 and the cam is in great condition, the 04 won't rev much harder.

  10. #10
    So if we run 04/05 rockershafts it will be better oil supply. Does the 04 cam make more horsepower, Can we run them in the rxp-x and will it be any better.

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