need 2 know

2 replies to this topic
  • zach400f

Posted June 04, 2008 - 05:03 PM


i need 2 know the spark plug gap on my yz400f ?

and what the compretion is on the piston ? :thumbsup:

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • teddy81

Posted June 04, 2008 - 05:11 PM


400cc YZ400F 1998-1999 U24ESR-N 0.8 IU24 got this off the internet .8 inches you didnt specify the year. its probably 12.5 to 1 but dont know if any mods or anything was done to it.

  • yamihoo2

Posted June 05, 2008 - 06:09 AM


plug gap .028-.031" (.7-.8mm)

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

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 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.