how much decel popping is normal?


3 replies to this topic
  • humpness

Posted April 24, 2008 - 02:09 PM

#1

I have been reading past posts and have learned a lot! I bought a 07 yz450 a month ago. I love it. The question i have is that it backfires quite a bit at decel. How much is acceptable. I also dont get it started when cold until after about four kicks. Idle is steady. every thing is stock.
UNI filter(clean), 160main (stock),1500-3500 altitude(eastern oregon),
50-100 temp. air screw set at 1 3/4-2 turns.

any suggestions much appreciated.

  • William1

Posted April 24, 2008 - 02:19 PM

#2

Twist the throttle once or twice before cold starts, giver her a few squirts.

Open the fuel screw some more, that will often reduce popping. No more than 2.5 turns though.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted April 24, 2008 - 03:32 PM

#3

When it pops a few times on decel 1/2 to 3/4 of the time, that's about right. Look for an exhaust leak before you monkey with the carb.

  • corndog67

Posted April 25, 2008 - 09:02 PM

#4

I went to a 48 pilot, I'm at sea level, maybe a couple hundred of feet altitude, and it eliminated about 90% of the popping.





Related Content

Forums
Photo

James Stewart back on a YZ450F by YamaLink


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

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
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
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
 
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.