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

Megabomb Fitment by 288yz450


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

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 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
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
 
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.