06 YZ 450 Jetting


6 replies to this topic
  • 06_450 Rider

Posted February 02, 2007 - 12:22 PM

#1

Hey guys, I recently put on a White Bros. E2 Slip-on on my 450, and rode it a couple times and realized i need to rejet due to the popping on decel. So i got the FMF Power up Jet kit and it came with 4 main jets which were 142, 146, 150, 155, Fuel Needle, and the 48 pilot jet, and i was wondering which jets should i put in to take away all the popping and not running correctly? Thanks for the Help:thumbsup:

  • haole

Posted February 02, 2007 - 12:27 PM

#2

all those mains sound way too lean for an 06. try the 48 pilot first, that should help. which needle is it?

  • 06_450 Rider

Posted February 02, 2007 - 12:32 PM

#3

Yeah i thought the same thing.. the needle it says 987. Thanks for the help

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  • Ranger18

Posted February 02, 2007 - 01:44 PM

#4

Hey guys, I recently put on a White Bros. E2 Slip-on on my 450, and rode it a couple times and realized i need to rejet due to the popping on decel. So i got the FMF Power up Jet kit and it came with 4 main jets which were 142, 146, 150, 155, Fuel Needle, and the 48 pilot jet, and i was wondering which jets should i put in to take away all the popping and not running correctly? Thanks for the Help:thumbsup:


Take that kit back, it sounds like you wasted some $$$.:ride:
If I were to buy a kit I would get a JD, but for the 06 YZF450 all you need is a 45 pilot a 168/170 main, and if you want a different needle get the NFLR from yamaha. I run a 45/170 with the NFLR with great results. No bog, no pop, nothing but great responce. I've taken my bike up to 10,000' and had a 42/160 in it and it was fine, so I don't think there is any place in the world were those mains will work for you. With the E2 you might need a 48 pilot, but that all depends on temps, and elevation.
Good Luck

  • qwert321

Posted February 02, 2007 - 03:37 PM

#5

the 07 suppose to have a 160main stock with the nflr needle is it not?so why is 160 to lean?

  • skipperlantz

Posted February 02, 2007 - 05:39 PM

#6

It depends on elevation. All those jets sound to lean to me. Try a 165 main and 48 pilot if your anywhere near sea level and it should help.

  • Ranger18

Posted February 04, 2007 - 05:07 PM

#7

the 07 suppose to have a 160main stock with the nflr needle is it not?so why is 160 to lean?


The 07 does have an NFLR but the 06 does not. Like I said, the 06 doesn't need the NFLR, but I like it. And 160 is too lean; I don't know why the factory went so lean, but they did. 160 is too lean because with lower elevations and cold dense air, you need to match that with more fuel. If you ride in higher elevations and or hot temps, then a lower jet will work. When I ride at 8-10K I use a 160 main. And for the record my old CRF had like a 175 main, so take it for what it's worth.





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