yz450f valve length?

1 reply to this topic
  • Cadoewen

Posted September 25, 2010 - 09:35 AM


about a month ago i had 5 new valves put into my bike (06 yz450) by my local shop because i didnt have the valve tools. recently i had time and i went to put my bike back together and i was alarmed to see that my exhaust cam was resting on top of the buckets and not touching the head. i even tried it with the smallest shim i have and it is still just resting on top of the buckets/spring. i then took my head off and apart to inspect it and the head is not dammaged and everything looks completely normal. the only conclusion i can think of is that the shop had installed the wrong valves in the wrong places. :ride::banghead::banghead: does anyone here know the measurements of the valves? so that i know which one is which. there doesnt seem to be any markings on the valves to distinguish them from another.


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

Posted September 25, 2010 - 12:48 PM


The exhausts have a larger head diameter than the intakes, and the center intake is shorter than the outer two. The only mistake the shop could have mad with OEM valves is to have cut too much from the seats, or failed to correct the installed stem height.

Did the shop have your cams, lifters, etc., when they did the job?

Related Content


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

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 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.