Need advice on valve shims- 99 YZ400F


3 replies to this topic
  • SpceSpff

Posted February 07, 2009 - 11:34 AM

#1

I just checked my valves for the first time, and wanted to see what everyone thinks of my clearances.

Intake L to R- .15 .17 .20

Exhaust L to R- .25 .33

All but the one exhaust are within specs. I should probably tighten up the exhaust, right? How about the others, some are right at the end of the specs.

I recently valved my 2007 Kawasaki KLR, and everyone says slappy valves are happy valves for that bike. Is there any school of thought on the YZ's? Any idea if the valve shims from the KLR will fit in the YZ?

Thanks!

  • uprightchicken

Posted February 07, 2009 - 11:47 AM

#2

I don't know about the shims from a KLR but I used Hot Cams valve shims for a CRF450R from work on my YZ450F and they fit perfectly. I am old school and read in thousandths rather than millis so I can't think of what your clearances are off my head without a conversion and I'm not sure what your stock specs should be. If you are in spec with all but your one exhaust and its not out by much I would just ride it. The exhausts will tighten up slower than the intakes so just keep checking regularly and you'll be fine. Or if you feel like you wont sleep at night knowing one is off then adjust it, just kinda a pain in the ass on a twin camer for one exhaust valve if its not that bad, IMO.

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

Posted February 07, 2009 - 12:36 PM

#3

Reshim the one exhaust valve that's out. You'll be good.

  • SpceSpff

Posted February 07, 2009 - 04:11 PM

#4

Thanks for the answers!





Related Content

Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo
Supercross

Wilson the Blue Privateer by jetfuel


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 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
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 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.