oh no!!!

11 replies to this topic

Posted December 06, 2005 - 08:18 PM


oh no!!!!!!!!!!i just took off my clutch basket cover and a needle bearing popped out. it's not the needle bearing that's goes to the pushrod.. what are other bearing could it be?

  • BC61

Posted December 06, 2005 - 10:05 PM


The only needle bearings in the engine that I know of/found in manual are the pushrod, balancer and rod bearings. How big is the needle?


Posted December 06, 2005 - 10:10 PM


it's smaller than te pushrod bearing..looks like about a 1/4 or a 5/16 bearing..


Posted December 07, 2005 - 06:43 PM


any ideas?? looks like it was grinding around my clutch basket... here are some pics!!

here it is the way i found it

behind the clutch basket

damage to the clutch basket

the bearing looks to be a 1/4" smaller than the one that came out of the pushrod housing area..

  • MathProf

Posted December 07, 2005 - 07:14 PM


Take a look at the OEM exploded view


look at other pics to find your vearing.

  • 2000yzf426

Posted December 07, 2005 - 07:31 PM


Just a shot in the dark but could it be #26 on this picture
http://parts.motorsp...1948,2,88423976 but then there would also have to be pieces of a spring and rubber

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

Posted December 07, 2005 - 07:41 PM


thanks!!good call! i think that's it.. time to start tearing down some more... i'll let you guys know! there was no spring but that doesn't mean thats not it!!

  • kawirider

Posted December 07, 2005 - 08:08 PM


Maybe I am weird, but I think the inside of a mx thumpers motor is so interesting.


Posted December 07, 2005 - 08:52 PM


ok guys are you ready for this?? i am in the process of replacing the head because of wear. the valves and everything were fine but i noticed the end of my exhaust cam cap was cracked. well i didn't notice before but the ball bearing at the end of that cap popped out and went through the motor and ended up lodged in the clutch basket... what are the odds. the inside of the motor looks pretty good. i have to replace one gear but that's it.. these fourstrokes are interesting!!! thanks for all your help guys. i was about to take it to a shop but when you guys responded i decided just to go for it!! thanks again!!

  • sirthumpalot

Posted December 08, 2005 - 04:10 AM


You have great luck that didn't find its way between some other parts! Good find and good luck with the rebuild. Go buy yourself a lotto ticket while you're waiting for your parts to come in. :applause:

  • ncmountainman

Posted December 08, 2005 - 06:06 AM


i never realized there was a ball bearing involved with cam removal? is it inside the cap for a oil check,and can only get out if broken?

  • BC61

Posted December 08, 2005 - 06:44 AM


:applause: ..... the pic shows a ball bearing not a needle bearing..... :ride:

Related Content


2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 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.