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Thread: TRX450R Valve Adjustment HOW-TO

  1. #31
    Join Date
    Jun 2006
    Location
    Shen. Valley, VA
    Posts
    1,190
    Bumping this for others.
    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. #32
    Join Date
    Nov 2010
    Posts
    1,657
    yup, great write up! Sometimes it's scary going in to do this for the first time, but if you follow this guide it's a no brainer. Once you do it one time you'll have the confidence to do it everytime. Decomp can be confusing, but the easiest method i find for it is to use the service manual to check it. use feelers and set the gap right where it should be.

  3. #33
    Join Date
    Dec 2011
    Location
    New Jersey
    Posts
    86
    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...

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