2 replies to this topic
  • Randall

Posted September 27, 2007 - 04:54 PM


98 YZ 400 - would like to check the valve clearances in the morning but not familiar with Yamaha 4strokes yet. Bring it around on top dead center on compression stroke? and what kind of clearances am I looking for intake and exhaust?
Thanks alot, Randall

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 1rkcooper

Posted September 27, 2007 - 06:00 PM


Check at the top of the YZ forum. There is a sticky there for common threads, look in there for a weath of info. Manual info should be found here.

  • grayracer513

Posted September 27, 2007 - 07:45 PM


A better manual site is:

The ones you get from there can be printed.

There is a valve adjust how-to in Common Threads, as coop said, and the clearance is .10-.15mm intake, .25-.30mm exhaust. Adjustment are done with shims. Camshaft torque is very important.

Related Content


05 yz450f not fast enough by RedeyeYZ

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies

Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 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

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 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.