2001 YZ426 Intake Valve Lifter is tight


3 replies to this topic
  • YZ Yankee

Posted October 20, 2015 - 02:14 PM

#1

Hey... I was re-assembling my top end, after changing valve springs, and noticed that one of the intake valve lifters had alot of friction going on. I actually needed to grab it with some pliers to pull it back off! That is not something that caught my attention during dis-assembly.

I actually tried some of the other lifters to see if it made a difference, it did not. Nothing seemed to be touching. I thought maybe the valve spring was slightly wider or perhaps the blue identifying "paint" was sprayed on a little thicker.

I tried working it on and off, with a little motor oil for lube. Seems to be better.

Any insight on this? Could this be a problem?

Thanks for your input. This is my first engine breakdown.

Edited by YZ Yankee, October 20, 2015 - 02:17 PM.


  • grayracer513

Posted October 20, 2015 - 02:42 PM

#2

You returned each of the lifters to their original bores, didn't you?

 

If not, take the tight one and find which of the 5 holes it fits best into.



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

Posted October 20, 2015 - 04:23 PM

#3

You returned each of the lifters to their original bores, didn't you?

If not, take the tight one and find which of the 5 holes it fits best into.

I believe it is in the original spot. To see if it made a difference, I did put on of the others in the same hole and it was tight there also. That's why I thought, perhaps it was a tight fit around the valve spring. Maybe the finish on the valve spring was the issue. There is visible clearence around the lifter.

  • grayracer513

Posted October 21, 2015 - 06:29 AM

#4

Look for a ridge at the top edge of the lifter bore where the cam bore cuts across it.  If not that, I'd recommend you get an eyes-on inspection from a machinist to see what's up. 







Related Content

Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
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
 
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.