09 yz450f front sproket leak


8 replies to this topic
  • charles_guy91

Posted May 23, 2011 - 04:50 PM

#1

I just put my bike back together after a winter tune up, never touched the front sproket. Never leaked before but as soon as i started her up a low leak started dripping from my front sproket. I did put her on her side so i could open up the clutch. Would that have caused this? Anyone with advice would be awesome. Thanks!!

  • yz450fcranker

Posted May 23, 2011 - 11:31 PM

#2

maybe its time for a new sprocket

  • dirtcrow

Posted May 23, 2011 - 11:39 PM

#3

Your counter shaft oil seal might be worn and needs replacement.

  • jratcliffe3

Posted May 24, 2011 - 12:27 AM

#4

New seal needed

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

Posted May 24, 2011 - 12:53 AM

#5

Remove the sprocket, pop out the old seal and press in a new one. Give everything a thorough clean first. :smirk:

  • RiderX

Posted May 24, 2011 - 05:33 AM

#6

If you have any problems getting it out one trick is to run a small wood screw into the metal part of the seal a little bit so you have something to grab a hold of to pull it out.

Oh, and don't forget to lube the lip of the seal up with some motor oil before you install it.

  • charles_guy91

Posted June 06, 2011 - 01:56 PM

#7

So got my new seal, tried a few times to get the old seal out with no luck, tried the wood screw idea but couldn't get it to hold, maybe it was to big of a screw, gonna try again tommorrow. Any more tips would be greatful. thanks again guys

  • grayracer513

Posted June 06, 2011 - 02:24 PM

#8

Two approaches to take:

First:
  • Using a punch or screwdriver blade, tap around the edges of the seal, driving it IN a small amount. This will break the bond between the case and seal.
  • Using a wire hook, machinist's pick, etc., pull the seal out.

Or:
  • Remove the steel collar from the output shaft
  • Insert a tool under the seal and pry it out

You can often just catch the outer edge with a small screwdriver or knife blade and pluck them out that way.

If the collar doesn't want to slide off:
  • Tap the output shaft straight in toward the opposite side of the case. This will break the bond between the O-ring on the output shaft and the collar.
  • With the trans in gear, grab the collar with a pair of pliers and turn it on the shaft as you pull.

  • There is an O-ring on the shaft under the collar. Replace it.
  • The collar may have a groove worn in it by the seal. If so, replace it.
  • Don't install the seal too deeply. Insert it no farther than flush with the case.
  • The undercut side of the sprocket (if it has one) goes IN.


  • charles_guy91

Posted June 09, 2011 - 09:54 AM

#9

Using your advice got it off and new one on! Works great, get some good riding in this weekend finaly thanks!





Related Content

Forums
Photo

YZ450FX OR YZ450F by MESSMAKER


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 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.