new to 4 stroke..06 yz450

8 replies to this topic
  • pink63impala

Posted April 10, 2009 - 05:10 PM


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


Posted Image

  • diegox450

Posted April 10, 2009 - 05:19 PM


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


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

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


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • pink63impala

Posted April 10, 2009 - 06:13 PM


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




Posted April 10, 2009 - 07:18 PM


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


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


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


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.

Related Content


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

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies

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.