2007 yz450 popping


16 replies to this topic
  • 88motoman88

Posted December 13, 2015 - 10:51 AM

#1

Runs great but pops quite a bit. Starts not to bad. Stock jets. Stock bike really, well weisco piston, hot rod crank. Stock exhaust. I dont know where the fuel screw is. Seems like the idle screw makes little difference in the idle. I do have a ket kit for it with a 160 m amd 45 pilot. What should i do to start?

  • 88motoman88

Posted December 13, 2015 - 12:23 PM

#2

I just took my jets out and they are already 45 pilot. And 160 main. What should i look at now. Fuel screw?

  • stevethe

Posted December 14, 2015 - 01:38 AM

#3

If it's poping on decel it's pretty normal.

  • 88motoman88

Posted December 14, 2015 - 04:28 AM

#4

Im the only guy really when i go riding. It must be running rich or lean or something, prob an adjustment

  • Krannie McKranface

Posted December 14, 2015 - 06:08 AM

#5

Service the carb

http://www.dirtrider...r_carb_rebuild/

Put on a remote fuel screw and learn how to use it



  • grayracer513

Posted December 14, 2015 - 07:07 AM

#6

If it was me, I'd check the exhaust for leaks before I screwed around with the carburetor.



  • 88motoman88

Posted December 14, 2015 - 11:14 AM

#7

I did repack the muffler. Where would it leak? The connection at the head and the connection where the pipes connect?

  • RockerYZWR

Posted December 14, 2015 - 11:27 AM

#8

Yep.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 88motoman88

Posted December 15, 2015 - 04:25 AM

#9

Ok ill check for leaks. Is it possible when i repacked the pipe i have a leak there? Also i checked the fuel screw and it was one and a quarter turns out. Could that be the problem? I thought it was suppose to be 2 ish roughly with my jets 160 m an 45pilot. Im at sea level

  • grayracer513

Posted December 15, 2015 - 07:30 AM

#10

... i checked the fuel screw and it was one and a quarter turns out. Could that be the problem? I thought it was suppose to be 2 ish roughly with my jets 160 m an 45pilot. Im at sea level

 

should be closer to two.

 

http://www.thumperta...ircuit-setting/



  • 88motoman88

Posted December 20, 2015 - 05:04 AM

#11

So i cleaned the pilot and main jet and adjusted tje fuel screw to 1 3/4 turns. Almost no popping now but when i wemt ro start it i smelt gas and had to push start it to get it running. After riding for awhile ot did start again woth like 4 kicks. Is it to rich. Ive never smelt gas

  • 88motoman88

Posted December 20, 2015 - 05:06 AM

#12

The idle is def still hanging though. I read that is from a lean condition and i meant to say 1 and 1/2 turns out

  • grayracer513

Posted December 20, 2015 - 08:38 AM

#13

Check your valve clearance.



  • Krannie McKranface

Posted December 20, 2015 - 06:22 PM

#14

The idle is def still hanging though. I read that is from a lean condition and i meant to say 1 and 1/2 turns out

hot start

fuel screw oring

header crush washer

loose boots

worn out slide plate seal



  • 88motoman88

Posted December 26, 2015 - 02:19 PM

#15

Gray i checked the valves the intake were .10mm and the exhaust .20. Should i move on the fuel screw setting again?

  • 88motoman88

Posted December 26, 2015 - 02:29 PM

#16

Seems like the hot start plastic screw into the top of the carb is tight, header is tight with a new crush washer installed at rebuild. I didnt take it off but it seems tight with no leak, boots seem tight and in place. Stupid question but is one turn on thw fuel screw a 360 or 180 degree turn?

  • grayracer513

Posted December 27, 2015 - 06:20 PM

#17

180 is obviously half of one turn





Related Content

Forums
Photo

Should I buy this bike? help....... by Numsa Hul


Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies
Forums
Photo

YZ450FX OR YZ450F by MESSMAKER


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 replies
Forums
Photo

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
Reviews

Yamaha YZ450F 2017 by Chris.GVS


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

James Stewart back on a YZ450F by YamaLink


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