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Thread: Cooling the YZ450

  1. #1
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    Cooling the YZ450

    As summer is on its way I spent some time this morning sorting decent cooling for the mule

    Normally ground speed provides sufficient airflow through the radiators, but tricky tracks, hillclimbs, and/or waiting for your mates can see engine temps soar to oil destroying heights.

    The factory stator supplies 130watts of 12v power , as it has to supply the fuel pump etc whilst kickstarting, so no problem using a 12v fan in the system somewhere.


    Time for more air courtesy of a new Cooling fan from a 2014 WR450


    Mod the shroud for a tight fit.


    There are plenty of 12v accessory plugs and I have connected into one of them with a fused switch to activate the fan.


    Now the second trick is to sort the radiator over flow, which normally vents to the ground creating a large air gap in the top tank when the engine cools, -time for a catch can, installed inside the rear subframe.




    Now on the engine control side you can sort all sorts of things, here we see rpm, air temp, water temp, air pressure and throttle position



    To help cool things a little its helpful to take out some fuel and add ignition advance

    The standard fuel injection and ignition settings are all zeros
    Here you can see I have removed fuel and added ignition advance, both through the rev range and the range of throttle positions.



    This setting takes it to just over 60hp at sea level.

    Today is warm and tomorrow is meant to be better temperature wise, -be a great test for these mods.

    Last edited by 7mmsaum; 06-11-2016 at 07:15 AM.
    A big fast bullet beats a little fast bullet every time

  2. #2
    Member craigc's Avatar
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    450! Do you get out of second gear? I rode one set up for motocross on a trail ride; compared to my 250 it went like a cut cat!
    7mmsaum likes this.

  3. #3
    Almost literate. veitnamcam's Avatar
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    I thought leaner is hotter with petrol?

    Sent from my SM-G800Y using Tapatalk
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  4. #4
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    Quote Originally Posted by veitnamcam View Post
    I thought leaner is hotter with petrol?

    Sent from my SM-G800Y using Tapatalk

    Yes leaner is hotter, I will try it tomorrow and take the tuner with me, can easily add more fuel in the areas of throttle that are used most when carrying a heavy pack, ie; under 10% throttle
    veitnamcam likes this.
    A big fast bullet beats a little fast bullet every time

  5. #5
    Fulla
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    Are the blue computer screen things common to the public these days?
    I thought only service departments would have them.

  6. #6
    OPCz Rushy's Avatar
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    Being as technical as the hole in a doughnut and moreover having never been into motorbikes, my take out from this thread is "summer is on its way". Choice.
    It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.
    What more do we need? If we are above ground and breathing the rest is up to us!
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    Rule 7: Avoid alcohol and drugs when handling firearms

  7. #7
    Member stumpy's Avatar
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    what are you running in the coolant ? have you looked at the water wetter type additives?
    NO MATTER HOW MUCH IT HURTS, HOW DARK IT GETS OR HOW FAR YOU FALL , .....
    YOU ARE NEVER OUT OF THE FIGHT . (Marcus Luttrell)

  8. #8
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    Quote Originally Posted by stumpy View Post
    what are you running in the coolant ? have you looked at the water wetter type additives?

    Yes, engine ice etc work well.
    stumpy likes this.
    A big fast bullet beats a little fast bullet every time

  9. #9
    Addicted puku's Avatar
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    I hate to be the downer. But wouldn't it be easier to get a wr at the start....

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    Freezer, BushHunter and stumpy like this.
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  10. #10
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    Quote Originally Posted by puku View Post
    I hate to be the downer. But wouldn't it be easier to get a wr at the start....

    Sent from my SM-G900F using Tapatalk
    The YZ is lighter, faster and more powerful than the WR

    I diddnt really buy it to carry stuff, I got it to ride like a lunatic up widowmaker hillclimbs and tear around army land at the tussock buster and berm Buster events

    Its seriously fun to ride and makes your face hurt from grinning all day

    It doesn't mind carting the extra weight of a pack when required
    puku likes this.
    A big fast bullet beats a little fast bullet every time

  11. #11
    Member stumpy's Avatar
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    whats the power stats , compared to a cr500 honda , ... alwys wanted to put that engine in a road bike chassis ... like a tzr
    NO MATTER HOW MUCH IT HURTS, HOW DARK IT GETS OR HOW FAR YOU FALL , .....
    YOU ARE NEVER OUT OF THE FIGHT . (Marcus Luttrell)

  12. #12
    Member BRADS's Avatar
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    Quote Originally Posted by stumpy View Post
    whats the power stats , compared to a cr500 honda , ... alwys wanted to put that engine in a road bike chassis ... like a tzr
    7mmsaums bike is around 3hp more than a CR500, also around 3x easier to ride for us mortals😃

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    Blaser and stumpy like this.

  13. #13
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    Quote Originally Posted by bully View Post
    Are the blue computer screen things common to the public these days?
    I thought only service departments would have them.
    The power tuner can be purchased from any Yamaha dealership

    A big fast bullet beats a little fast bullet every time

  14. #14
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    Quote Originally Posted by stumpy View Post
    whats the power stats , compared to a cr500 honda , ... alwys wanted to put that engine in a road bike chassis ... like a tzr

    KX500 = 55hp
    CR500 = 56hp

    2014 YZ450 = 59hp

    The new 4 stroke mx bikes redline at 11,000 rpm and do so in the blink of an eye.

    In a road bike chassis I would think long and hard about the type of power delivery you wanted.

    The CR/KX engine is ok but if slick shifting is your thing then their gearboxes will disappoint

    The new gen MX engines can all be tuned to suit the conditions with a power tuner ( can store 9 different maps) and make so much torque they feel like much larger engines.

    A road bike can be all about balance, between the chassis, grip and weight distribution, if I was building one now I would use a late model engine so you could tune the engine in sync with the rest of the bike and your riding style.

    The KX/CR500 has a bit of a cult following now with the help of old misty eyed coots and their attributes have swelled with the passage of time.

    Everything on the newer generation of bikes is much better than a bike that finished its production run in 2004
    308, Shearer and stumpy like this.
    A big fast bullet beats a little fast bullet every time

  15. #15
    Almost literate. veitnamcam's Avatar
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    Id be concerned about the 450s longevity in a road bike frame also. Potential and probable to run at higher loads for longer durations than in a dirtframe.

    Sent from my SM-G388F using Tapatalk
    BRADS likes this.
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

 

 

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