//ArrowChat Code
Results 1 to 11 of 11

Thread: 04' YFZ 450 Q's

  1. #1
    krizo88's Avatar
    krizo88 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2003
    --
    297

    04' YFZ 450 Q's

    I took the air box lid off and the spark arrestor out on my YFZ 450. By taking the spark arrestor out it gave it alot better sound. I was wondering if taking the arrestor out will damage the motor any. And is there a chance I have to rejet? I havent rode it yet because I heard that it could damage my motor. Any of you guys have one of these machines? If so what are some quick mods that can be done to them? Am I gaining any power by taking the air box lid off and removing the spark arrestor? Thanks Chris
    1985 TRI Z
    1985 ATC 250R
    2004 YFZ 450

  2. #2
    Join Date
    Mar 2003
    Location
    Barnesville,Ohio
    --
    2,298
    taking out the spark arrestor shouldnt hurt anything...except if you are ridin thru a nice dry field and a spark comes out, the whole thing is on fire before you know it
    1985 Honda 350X - a lot of performance stuff, everything but a cam, hope to get one soon
    1984 Honda 200ES
    198? Yamaha YT60 Tri-Zinger
    TrikeFest '04 & '07 Survivor

  3. #3
    yater is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Jun 2003
    Location
    Tyler, Texas
    --
    672
    I ran my 200x without the spark arrestor and never had a problem. Might want another opinion on such an expensive machine though.

  4. #4
    KASEY's Avatar
    KASEY is offline weee weeee weeeeeeeeeee ! ! ! The day begins with 3WW
    Join Date
    Jan 2003
    Location
    ARIZONAS BIGGEST TROUBLEMAKER
    --
    4,237
    a bigger concern would be running lean and burning your motor up,,, taking the lid off and the spark aresstor out changes airflow,, which in turn means a jetting change,,, i would put it back on and leave it ,,, more noise does not more power on a stock machine,,,,, call and talk to your yamaha dealer,,, i am sure they will try to sell you hop up parts,, but at least you will be informed about nessesary jet changes that need to be made........................

  5. #5
    krizo88's Avatar
    krizo88 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2003
    --
    297
    I called and the guy that I talked to said I dont need to change jetting, but then he said even if I put a aftermarket pipe on it, I woouldnt have to re jet, which I think he is wrong. What do you think if I put the lid back on it and left the aresstor out (bent it up pretty bad taking it out). Its hard to tell if its running lean because the thing never smokes. Maybe I should just put it all back together and buy a pipe after the motor is good and broke in.
    1985 TRI Z
    1985 ATC 250R
    2004 YFZ 450

  6. #6
    Join Date
    Feb 2004
    Location
    Us
    --
    727
    read your plug, it will never let you down. should be light gray to tan color. if it is too lean it will look white. heres a link to look at.
    http://www.triumphspitfire.nl/plugs.html

  7. #7
    KASEY's Avatar
    KASEY is offline weee weeee weeeeeeeeeee ! ! ! The day begins with 3WW
    Join Date
    Jan 2003
    Location
    ARIZONAS BIGGEST TROUBLEMAKER
    --
    4,237
    so i have to ask,,, what would the reason be ,, to start stripping stuff off a BRAND NEW $7000 machine before its even broke in???

  8. #8
    Join Date
    Dec 2003
    Location
    Ontario, Canada
    --
    235
    I would change it back to stock at least for break in,

    question for you guys though if you put a YZ450F cam in the quad will it add much if anything, there is a used one for sale and it said it has it done and its the fasted quad you can buy? is this true
    1986 452x, 4inch westcoast swinger, full exhaust, and stage 5 racing kit
    99 honda 300 4x4
    06 Forman 500 4x4
    07 Fourtrax 420 FI

    Previous rides
    81 250r, 83 Cr 250, 85 250 big red, 80 185, 84 200s, 83 KLT 200, 86 Alt 185, 01 WR 250, 83 250r, 84 250r, 1986 350x, 1985 350x, 87 350x, 91 big bear, 01 DS 650, 03 Kodiak 450.

  9. #9
    KASEY's Avatar
    KASEY is offline weee weeee weeeeeeeeeee ! ! ! The day begins with 3WW
    Join Date
    Jan 2003
    Location
    ARIZONAS BIGGEST TROUBLEMAKER
    --
    4,237
    i have ridden with several 450's and the fastest one i have seen ,, had a full exahust system , airbox mod, and the cam mod that yamaha does,,, same cam different timing,,
    it was plenty fast too,,,

  10. #10
    krizo88's Avatar
    krizo88 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2003
    --
    297
    Well the main reason I took the spark aresstor out is to kind of give me an idea of what it would sound like with aftermarket exhaust, and the reason for the lid was just to see if it would give it a bit more power (which it didnt) so I put it back on. I am trying to get the 450 to keep up with my R. Anyways I just couldnt see myself spending 7 grand on something and not tinker around with it. Thats how you learn. Taking it out to our local track today to burn around. You guys think 10 dollars a day is a bit steep to ride a track? And 15 a day for dirtbikes? The place used to have a membership for 27 bucks a season, but this year they arent offering a membership. I am going to have to buy up some land and make my own track.
    1985 TRI Z
    1985 ATC 250R
    2004 YFZ 450

  11. #11
    If you want to tinker with it, pop the lid, drop the needle down 1 clip, jet up a couple sizes, and yank the arrester, My dumbarse buddy just did it to his 7000.00 quad and he said it made a difference. He's insisting on a hard breakin. Bluetraxx.com is a good site for the YFZ, I like the quad, not bad for a golfcart.
    1985 350x
    1985 350x
    1985 250r
    200 auto x
    1984 250r
    1982 250r
    85 Tecate
    86 Tri Z
    85 TRI Z
    98Wolverine
    99TRX 300

    I need a 86 250r Headlight lens!!!! Hook me up!!!!









    Westcoasters check out the Florence ride....

    http://www.3wheelerworldforums.com/s...ad.php?t=42267

//ArrowChat Integreation Code //