2003 YZ450F New owner


6 replies to this topic
  • zimak

Posted February 01, 2008 - 07:52 AM

#1

Hi guys, I'm helping a friend setup and inspect a 2003 YZ450F he just picked up this week.
First owner dumped a ton of money in it and sold it.
Second owner never did any maintenance just rode it 2-3 times and garaged it.

Starts 1-2 kick when cold and 1st kick every time when warm. Some minor gremlins we've found and are fixing (parts on order) but here is one thats got me confused.

Went to check and adjust valves last night and here is what I found when trying to get it to TDC.

Posted Image


....its not supposed to look like that is it? Any idea what part and part numbers I'm missing?

  • TD-3

Posted February 01, 2008 - 07:57 AM

#2

Looks like an aftermarket flywheel weight, sans timing mark. You'll have to find TDC and mark it yourself.

  • TD-3

Posted February 01, 2008 - 07:59 AM

#3

Also, the breather tube is kinda pinched in the bottom clamp, you may want to re-route that higher on the frame.

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

Posted February 01, 2008 - 08:14 AM

#4

Ok so short version, how do I find TDC compression stroke to mark it so that it aligns in the window?

  • TD-3

Posted February 01, 2008 - 08:29 AM

#5

http://www.thumperta...ad.php?t=358235

  • grayracer513

Posted February 01, 2008 - 09:55 AM

#6

You WILL want to fix the breather tube, or you may be introduced to the fabulous ejected decomp bore plug, as well. This is an early YZ450 tradition you can do without:

http://www.thumperta...419#post1522419

  • mxdad32

Posted February 01, 2008 - 10:04 AM

#7

It looks as if the first owner marked it with a perm. marker if you look in the center hole. Unless that is a mark you put there.





Related Content

Forums
Photo

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
Forums
Photo

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


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Forums
Photo

YZ450F 03 Sparks driving me crazy by SirAttard


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


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

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
 
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.