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  1. #1
    427 THUNDERBOLT DynoTom's Avatar
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    4I NOTCH's YFZ 450 BUILD .

    Well , it's time to "turn up the wick" on Jesse's YFZ 450 !


    The ATV is a 2008 YFZ 450 SPX with about 20 hours on it.....



    Factory break in is done now and we are going to install some real "go fast " parts on this Mather Facker !


    Stay tuned for pics and vids of the build up !

  2. #2
    427 THUNDERBOLT DynoTom's Avatar
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    Plan

    The first parts going on will be a aftermarket exhaust system from Monster Pipe , fabricated aluminum airbox with conical K & N filter , Dyno Jet Master Kit carb jets .


    These mods will really wake up the YFZ !


    Should net us about a 10 HP gain !


    I want to really get into tuning ATV engines for power.....I have been learning as much as I can about tuning online and it's really interesting to see how much there is out there....


    Watch this post , as the parts come in I will update with pics....

  3. #3
    I wanna go fast... $title Champion Crawlin's Avatar
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    sweet! hope to see pics. thought my computer was going screwy till the last sentence, haha.

  4. #4
    oh snap. u know that raptor wont have a chance after that hahaha
    2002 dodge cummins - mechanically injected, stupid built.. never ending project
    2013 Toyota Tacoma - crewcab, v6, 6 spd, 4wd, TRD package

  5. #5
    427 THUNDERBOLT DynoTom's Avatar
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    Starting point

    Here is the 450 we are starting with.....I want to be sure we don't do anything to mod it that makes it less of a trail machine since we ride state trails in summer months....



  6. #6
    427 THUNDERBOLT DynoTom's Avatar
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    We wil see !

    Quote Originally Posted by SmokinRAM114 View Post
    oh snap. u know that raptor wont have a chance after that hahaha
    I know these 450's really wake up with the mods we are doing.....I guess we will see how it goes compared to my 700.....

  7. #7
    427 THUNDERBOLT DynoTom's Avatar
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    Parts coming in....

    Parts are starting to arrive here for the build up !

    Today the A ARM gaurds and the teather kill switches came in.....



  8. #8
    Erect Member. badass88gt's Avatar
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    Needs an 800 Vtwin transplant!!!


    I'll be watching this build. Your shit always turns out great, I'm sure this will be the same!

  9. #9
    427 THUNDERBOLT DynoTom's Avatar
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    Hi flow airbox k & n conicial

    I installed the new HI FLOW Airbox today.....I added some extra touches to improve things a liitle...


    I added some heat shield barrier tape to the airbox side that faces the exhaust pipe to try and keep that intake as as cool as it can be....






    I also added some rubber isolators to the airbox mouting screws , the factory airbox has a similar set up but , the aftermarket airbox did not..




    The HUGE K & N fliter is really a tight fit into this box ! My Raptor uses the same filter but, the airbox is quit a bit longer ...





    Here is the stock YFZ 450 airbox , as you can see it's very restrictive and has only a small air intake opening on it ....







    Here it the new set up installed complete , lots of AIR to breath in now !






    Here is the underside shot where the exhaust will be , you can see the heat barrier tape is placed perfect to keep temps down a little....


    Last edited by DynoTom; 02-23-2010 at 07:57 AM.

  10. #10
    427 THUNDERBOLT DynoTom's Avatar
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    Raptor a arm gaurds

    I also installed our Raptors A - Arm gaurds .....These are Pro Armor , I had to modify the outward mounting points as I have a 4 inch lowering kit on it....They are very quality pieces and will work very good I'm sure.....




  11. #11
    427 THUNDERBOLT DynoTom's Avatar
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    Jetting

    As soon as I get the new pipes on Jesse's YFZ I wanna get it out to do some test runs .....I need to jet the carb in and fine tune it.....I have the huge master jet kit from Dyno Jet with tons of jets and needles so I'm sure we will get this thing tuned in perfect.....Still more mods to come on this , we will go into the engine but, prolly not for this season....

  12. #12
    427 THUNDERBOLT DynoTom's Avatar
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    Test & tune yfz 450

    Today we did some test and tune on Jesse's YFZ.....I think we have it pretty close on jetting but , we are still lean....We are going back tommorow to tune some more....


    Here are some pics from todays tests....


  13. #13
    427 THUNDERBOLT DynoTom's Avatar
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    Checkin plug

    Jesse & Boss removing the spark plug to check color....



  14. #14
    427 THUNDERBOLT DynoTom's Avatar
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    Airbox Lid

    We decided to remove the airbox lid for more power....



  15. #15
    427 THUNDERBOLT DynoTom's Avatar
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    High Speed Test

    We needed some WOT runs to make sure the jets are right.....Power was great low to mid range but , would stumble slightly at the top end.....Here is some vids for the speed runs...Tommorow we will have this thing dailed in , we have to do a needle groove change and some possible main jet changes to make that happen.....I'm going to set this up to be slightly on the rich side to be safe.....


    http://s37.photobucket.com/albums/e9...=yfz450006.flv


    http://s37.photobucket.com/albums/e9...=yfz450008.flv
    Last edited by DynoTom; 04-03-2010 at 11:48 PM.

  16. #16
    427 THUNDERBOLT DynoTom's Avatar
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    Very close on tune

    Today we did some more test and tune on Jesse's YFZ....We changed the needle groove to #5 and went back to the 155 main jet....It seems to be close but, we do have a slight stutter just off idle.....We will now install a Boysen Quick Shot II pump cover to get rid of the stutter bog off idle....The stock accel pump cover is so small that it runs low / out of fuel and that is where the stutter comes from....I just ordered the Boysen Quick Shot so within a week or so we will go back and see what it does....I also got a new set of main , pilot and leak jets on order to fine tune to jets.....

  17. #17
    427 THUNDERBOLT DynoTom's Avatar
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    Yfz banshee high speed runs

    Here are some high speed test runs 80 + MPH easy....



    http://s37.photobucket.com/albums/e9...=yfz450025.flv
    Last edited by DynoTom; 04-04-2010 at 07:28 PM.

  18. #18
    427 THUNDERBOLT DynoTom's Avatar
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  19. #19
    427 THUNDERBOLT DynoTom's Avatar
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    Banshee Banshee Yfz


  20. #20
    427 THUNDERBOLT DynoTom's Avatar
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    Atv gld

    Boss was talking about doing some 1/8 mile runs @ GLD on the ATV's....Today Jesse spent some time doing launches...It's going to be quite tricky keeping the ATV's off the rear bumper but, I still wanna try it.....



    http://s37.photobucket.com/albums/e9...=yfz450036.flv

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