08 yz 450 stock jetting


9 replies to this topic
  • Big Black

Posted May 01, 2008 - 12:02 PM

#1

anyone know what the stock jetting is for 2008 yz 450, is every 08 yz 450 jetted the same from the factory? A local dealership made it sound like not all are jetted the same from the factory??


Thanks

  • grayracer513

Posted May 01, 2008 - 02:30 PM

#2

The stock jetting is listed in your manual in section 2. They are all the same unless the dealer swapped jets before selling it, which is, um, unlikely.

  • wolfie12

Posted May 01, 2008 - 03:59 PM

#3

anyone know what the stock jetting is for 2008 yz 450, is every 08 yz 450 jetted the same from the factory? A local dealership made it sound like not all are jetted the same from the factory??


Thanks


Off the top of my head, the US spec bikes came with a 42 pilot and 160 main. Im not sure about the needles or leak jet. I just changed my main to a 165.

  • Big Black

Posted May 02, 2008 - 07:46 PM

#4

Thanks for the info.


Brian

  • dirtbikeaddikt

Posted May 03, 2008 - 12:28 PM

#5

My 08 yz450 came with a 45 pilot and a 160 main. I swapped the 160 for a 155 and its runnin pretty good.

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  • Big Black

Posted May 04, 2008 - 07:10 AM

#6

My 08 came with 45 pilot and 160 main also, a local dealer here suggested i try a 48 pilot for the poppping etc.. Has anyone done that or what do you think, i'm gonna give it a shot

  • MX926

Posted May 04, 2008 - 06:12 PM

#7

My 08 came with
160 main
45 pilot
55 leak jet
ncyr needle 3rd position

I am currently running
168 main
45 pilot
55 leak jet
nflr neddle 3rd position

I live in south eastern minnesota, and I am running Power110 fuel mixed with pump gas. I run 1gal power110 with 4 gal pump gas. And the bike rips.

  • todds924

Posted May 05, 2008 - 04:20 PM

#8

Off the top of my head, the US spec bikes came with a 42 pilot and 160 main. Im not sure about the needles or leak jet. I just changed my main to a 165.


That is the wrong info. US spec bikes come with this: 160 main/45 pilot/NFLR needle,3rd posistion/55 leak jet. :eek:

  • mxracer206

Posted May 05, 2008 - 04:31 PM

#9

My 08 came with 45 pilot and 160 main also, a local dealer here suggested i try a 48 pilot for the poppping etc.. Has anyone done that or what do you think, i'm gonna give it a shot


I have had a 48 pilot in mine all season and it run's fine and start's easier. It was in the 70's this weekend and it was still ok but if it gets much warmer I will probably go back to a 45. I don't think I get it on the main jet much but on my son's it seems better with a 165 year around.

  • todds924

Posted May 05, 2008 - 08:12 PM

#10

I have had a 48 pilot in mine all season and it run's fine and start's easier. It was in the 70's this weekend and it was still ok but if it gets much warmer I will probably go back to a 45. I don't think I get it on the main jet much but on my son's it seems better with a 165 year around.


I think you may have problems with the 48 when it gets warmer. When i tried that my bike was very hard to start if i stalled it. I go down to a 42 pilot in the summer.





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