new to 4 stroke..06 yz450


8 replies to this topic
  • pink63impala

Posted April 10, 2009 - 05:10 PM

#1

just traded my 2 smoke for a yz450.
gew questions..
it has a white brother exhaust system. i notice when i give it some gas ,sometimes i see a blueish flame shoot out the end.also,when i ride it,say 2nd or 3 gear ,and let off the gas,i get a pop or backfire sound from it? is any of this normal?also i sometimes see blackish smoke when i rev it up,like to much fuel?the guy said i he changed the jetting and the needle position, but i havent been into it yet or know what setup to run. thanks

  • pink63impala

Posted April 10, 2009 - 05:16 PM

#2

Posted Image

  • diegox450

Posted April 10, 2009 - 05:19 PM

#3

It's a little on the rich side... nothing to worry... The flame is normal. My WR450 sometimes pop ups 1 foot flames when riding at night. The pops could indicate a lean condition... but you say that you see black smoke when revving it... it's contradictory...

BTW Nice looking bike, congrats!!!

  • grayracer513

Posted April 10, 2009 - 06:07 PM

#4

It's a little on the rich side...

Lean, usually. Not much to be concerned over, though:

http://www.thumperta...599#post3710599

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  • pink63impala

Posted April 10, 2009 - 06:13 PM

#5

Lean, usually. Not much to be concerned over, though:

http://www.thumperta...599#post3710599


thanks

  • REDBULLRICK

Posted April 10, 2009 - 07:18 PM

#6

on my dads 06 yz450 , we put a 45 pilot and a 170 main and moved the needle clip to the 4th one no more popping or backfire

  • live4speed

Posted April 17, 2009 - 08:08 AM

#7

popping usually means lean...180 main and 48 pilot...granted my bike had a stock pipe, but the stocker is 06 was damn near wide open anyway, and with those specs i got no popping, acceleration was greatly improved, throttle response seemed better, and last but not least...the bike would start!!! with the stock jetting i had the worst time getting that bike fired up...

  • hillclimbguy

Posted April 17, 2009 - 11:33 AM

#8

Nice bike. You made a good choice. Our bikes take a pounding and last. I dont think you'll be sorry.

  • grayracer513

Posted April 17, 2009 - 12:30 PM

#9

I own two '06's, and a 180 is way too big unless you're maybe ice racing at sea level. I run a 168 with DRD exhausts from sea level (and below, actually) to 3500 feet with no problem.





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