yz450f sputter at low throttle


45 replies to this topic
  • blakers213

Posted December 03, 2010 - 03:30 PM

#21

My 2009 has the same stutter at 1/4 steady throttle. Gray was right about the tps unplugging. I found it interesting that on JD jetting web site that Yamaha 450's are designed to do this and it can't be fixed... something about the ignition. When racing you don't notice this, which is what these bikes are designed for.

  • grayracer513

Posted December 03, 2010 - 03:55 PM

#22

Since neither of my '06's do it, I doubt they're designed to. I know several people who have made this problem go away.

  • yz450girl

Posted December 08, 2010 - 07:01 PM

#23

I discovered the sputter at low throttle was due to the air filter being completely nasty. Didnt occur to me to check it at first. The guy i got it from put wayyyy to much oil on this thing. different beast with a clean filter. lol

  • grayracer513

Posted December 08, 2010 - 09:25 PM

#24

Be advised that the only thing that makes a foam filter filter is oil. Also you should know that the air box of the '06-'09 models is an extraordinarily dirty place. Plan to clean and oil your filter after every day's ride.

  • blakers213

Posted December 09, 2010 - 06:02 AM

#25

Be advised that the only thing that makes a foam filter filter is oil. Also you should know that the air box of the '06-'09 models is an extraordinarily dirty place. Plan to clean and oil your filter after every day's ride.


I will second that, I can ride a short practice round (indoors even) and think ahh my filter can't be that dirty from that little nondusty ride. I will check it and the entire airbox will be coated in a film of dust.

  • yz450girl

Posted December 09, 2010 - 09:02 AM

#26

ill keep that in mind guys thanks. My other bike i had a k and n filter on and i cleaned it religiously. But since he said they didnt ride it much i didnt think to check the air filter at first. I was completely amazed at the filth.

  • yz450girl

Posted December 21, 2010 - 06:59 PM

#27

i bought a new air filter.. Put a uni on there. Still have sputter and popping so i am thinking i may need to rejet. I am in kentucky around 700 to 800 feet above sea level. any suggestions as to a jet kit. i am thinking maybe a jd kit or a dynojet kit.

  • Troutman

Posted December 21, 2010 - 08:16 PM

#28

Have you disconnected the TPS yet? That will take the low throttle sputter away immediately. To get rid of the back fire you will need to richen the jetting and adjust the fuel screw to the sweet spot between bogging and backfiring on decel.

  • yz450girl

Posted December 21, 2010 - 09:22 PM

#29

no i havent messed with the tps yet. hmm next warm day i will try adjust few screw and disconnect the tps. thanks.

  • yz450girl

Posted January 16, 2011 - 04:42 PM

#30

Instead of starting a new pointless thread I shall resurrect this one. I got my bike back today from my mechanic and I must say WOW!!! GOT it properly jetted, sag adjusted to my height weight, new chain and sprockets, and the seat shaved down. I officially can wheelie in fourth gear, no low end sputter and can flat foot one side. Im stoked !!! just wanted to share.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • ttr250dude

Posted January 19, 2011 - 03:53 PM

#31

How tall r u? My girlfriend was 5'3" and couldnt hold up anything bigger than her TTR125L haha

  • yz450girl

Posted January 20, 2011 - 09:35 AM

#32

i am also 5'3. But i have been riding since i was 7. That def helps.

  • ttr250dude

Posted January 20, 2011 - 02:21 PM

#33

Gotchya. My ex wasn't an avid rider and had only been riding for like 5 years. Ashley Fiolek is also 5'3".

  • yz450girl

Posted January 20, 2011 - 08:16 PM

#34

yes she is my hero. literally. i wrote her on her page and she actually responded to my email. I was completely stoked.

  • ttr250dude

Posted January 20, 2011 - 08:50 PM

#35

Yeah she's pretty awesome. She gave me her email address and I sent her a copy of her book and she actually signed it and sent it back!! I emailed her a few times about riding tips and what not and she responded every time!! Pretty badass eh? Definitely my hero.

  • dvn

Posted January 21, 2011 - 04:26 AM

#36

Here's a pic of my daughter with Ashley Fiolek from Southwick.
Posted Image

  • yz450girl

Posted January 21, 2011 - 12:07 PM

#37

that is completely awesome. I think she is great. I would love to someday meet her myself.

  • Mr. Neutron

Posted January 21, 2011 - 01:16 PM

#38

Instead of starting a new pointless thread I shall resurrect this one. I got my bike back today from my mechanic and I must say WOW!!! GOT it properly jetted, sag adjusted to my height weight, new chain and sprockets, and the seat shaved down. I officially can wheelie in fourth gear, no low end sputter and can flat foot one side. Im stoked !!! just wanted to share.




So the sputtering was due to jetting? B)

Cool that you got that, and a couple of other things, fixed! :smirk:

Jimmie

  • grayracer513

Posted January 21, 2011 - 01:50 PM

#39

So the sputtering was due to jetting? :smirk:

I've said that right along, but who listens to me?

  • yz450girl

Posted January 21, 2011 - 03:28 PM

#40

So the sputtering was due to jetting? B)

Cool that you got that, and a couple of other things, fixed! :smirk:

Jimmie

yeah oddly enough it was. The slip on from white brothers suggested stock jetting. so he just moved my clip up one and wahhhlahhha.
well that and a lil turn of the fuel screw.





Related Content

Forums
Photo

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Forums
Photo

First Hare scramble tips by dhend8


Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.