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Thread: TRX450R Valve Adjustment HOW-TO

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  1. #1
    Join Date
    Jun 2006
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    Shen. Valley, VA
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    TRX450R Valve Adjustment HOW-TO

    This is my own personal Valve Adjustment HOW-TO write up for the TRX450R....complete with detailed pictures.

    Its long winded...but its complete and, I would venture to say, idiot proof.

    It outlines the tools you need, steps, precautions, and detailed pictures.

    Special thanks to all of those involved behind the scenes!

    http://www.garyhott.com/valves.html
    My 2005 TRX450R - Specs, Mods, Dyno Testing, Tech Articles, Pics, Vids, & more.
    | '04 Honda TRX450R - Racers Edge, AZ 545cc "Me Gusta!" Flat Drag Bike |
    | '05 Honda TRX450R - Wicked Motors, MD 450cc "PunisheR" Play Drag Bike |

  2. #2
    Join Date
    Jul 2005
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    Oklahoma
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    Very nicely done!!!!
    <Mat>

    2007 YFZ 450.....with some goodies!!

    www.triple777racing.com

    "Dude, Don't laugh............I think I broke something"

  3. #3
    Join Date
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    NJ
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    Very nice, didn't get to read the entire thing yet but the pictures alone are 10 times better then the ones in most of the other guilds.

    I'll be using it soon when I switch from my HRC cam to my HC2.
    05 450r
    Motowoz LT F&R / SMC +3 / Elka Pro Dual Link / RPM / Flexx / Rath / Douglas
    DRG Head / Ferrea +1x4 / CP 12:1 / 05 HRC Cam / HR +3 Balanced&Welded / DRG 43.5 FCR / DASA Classic

  4. #4
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    Awesome job!!

  5. #5
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    Cloquet Mn
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    just a question, is it possible to be at the tdc and to be 180 degrees off
    money can't buy skill

  6. #6
    Join Date
    May 2005
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    Outside Philly
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    Originally posted by Houser450
    just a question, is it possible to be at the tdc and to be 180 degrees off
    not are long are the lobes are facing the rear.
    Steve #48

    2005 450r - In great shape, setup perfect for my riding style

    Aim: Sjorge3442
    Email : Sjorge_3442@hotmail.com


    Temple University

  7. #7
    Join Date
    Jun 2006
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    Originally posted by Houser450
    just a question, is it possible to be at the tdc and to be 180 degrees off
    There are TWO TDC's on these bikes. Why? Because for each crank rotation, the cam only rotates 180 degrees. So two rotations of the crank = one rotation of the cam. This is known as a wasted spark engine...

    You need to be at the TDC where the cam lobes are facing towards the rear of the bike, and slightly up.

    Hope this helps.
    My 2005 TRX450R - Specs, Mods, Dyno Testing, Tech Articles, Pics, Vids, & more.
    | '04 Honda TRX450R - Racers Edge, AZ 545cc "Me Gusta!" Flat Drag Bike |
    | '05 Honda TRX450R - Wicked Motors, MD 450cc "PunisheR" Play Drag Bike |

  8. #8
    Join Date
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    New Jersey
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    Quote Originally Posted by ghott View Post
    There are TWO TDC's on these bikes. Why? Because for each crank rotation, the cam only rotates 180 degrees. So two rotations of the crank = one rotation of the cam. This is known as a wasted spark engine...
    great write up, just wanted to point something out....2 TDC's are inherent to all 4 stroke engines, it has nothing to do with a waste spark ignition...

  9. #9
    Join Date
    Mar 2005
    Posts
    7,535
    Originally posted by Houser450
    just a question, is it possible to be at the tdc and to be 180 degrees off
    No, this is known as BDC or bottom dead center!

  10. #10
    Join Date
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    Originally posted by Chino886
    No, this is known as BDC or bottom dead center!
    4 strokes hit TDC twice for every ignition
    2 strokes hit TDC once for every ignition

    Like ghott said, the crank rotates twice for every one rotation of the cam in a 4 stroke.

    Thats how I understand it anyway =)
    05 450r
    Motowoz LT F&R / SMC +3 / Elka Pro Dual Link / RPM / Flexx / Rath / Douglas
    DRG Head / Ferrea +1x4 / CP 12:1 / 05 HRC Cam / HR +3 Balanced&Welded / DRG 43.5 FCR / DASA Classic

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