2002 YZ250F Cam Chain????


11 replies to this topic
  • jdarroyo

Posted 14 March 2006 - 02:16 PM

#1

I justed pick up a used 2002 YZ250F and wondering if i need to replace the cam chain on it???? How do you know when to replace it???

Jason

  • grayracer513

Posted 14 March 2006 - 03:33 PM

#2

Do you know when it was done last?

If not, just do it. $20 worth of the cheapest insurance you'll ever buy.

  • ButchWR250F

Posted 14 March 2006 - 03:55 PM

#3

If you don't know when it was done last, just do it. These chains stretch like crazy due to the automagic chain tensioner (stretcher). It's cheap insurance.

Take off the little bolt covering up the screw in the adjuster and turn it until it bottoms out, and count the turns. A new cam chain and good cam chain guides (not worn out) will give you about 1 1/2 turn until it bottoms out. If there is more than 1 3/4 to 2 turns, then that chain is gone (of course in my not so humble opinion).

Of course you need the special tool to remove the ignition rotor to do this job.... And a new ignition cover gasket wouldn't hurt either.

And don't forget to check the valves while you're at it. If it's a 2002, they probably need to be done too...

  • grayracer513

Posted 14 March 2006 - 04:28 PM

#4

If you don't know when it was done last, just do it.

Gee, that sounds familiar. :thumbsup:
But, I'm glad you agree.

These chains stretch like crazy due to the automagic chain tensioner (stretcher).

The life of the chain is extended by the presence of the automatic tensioner, not shortened. What stretches them is driving the cams. The pressure applied to the back side by the tensioner pales by comparison to the load on the front side at 10,000 RPM. You keep it from driving the camshafts, and they will last forever.

The thing you can't tell by the method of counting turns on the tensioner is whether the chain has any tightened links (kinked). The actual number of turns the tensioner will take on a new chain is going to vary significantly from bike to bike, as well, but the method works if you remember to make a note of the turns taken up when you put your new one in. And on the subject of special tools, don't forget the #27 Torx for the stator plate.

  • jdarroyo

Posted 14 March 2006 - 04:35 PM

#5

thanks for your help

  • cocopuff542

Posted 06 November 2012 - 07:16 AM

#6

deff change it its cheap and if you dont your bike wont even start after a while just like my 02 did

  • yamahakid88

Posted 07 November 2012 - 08:02 AM

#7

ya change it, everytime i check my valves i pull the head and just change the chain, I dont know if this is true or not but somebody said that regularly changing your cam chain will help with wear on the crankshaft sprocket thats at the bottom, because it cant be replaced without buying a whole new crankshaft. Like i said i don't know if this is true, anybody know?

  • oldnbold

Posted 07 November 2012 - 08:23 AM

#8

ya change it, everytime i check my valves i pull the head and just change the chain, I dont know if this is true or not but somebody said that regularly changing your cam chain will help with wear on the crankshaft sprocket thats at the bottom, because it cant be replaced without buying a whole new crankshaft. Like i said i don't know if this is true, anybody know?


yes it's true. the sprocket on the crank is part of the crankshaft. A stretched chain greatly accelerates the wear on the crank's sprocket.

  • yzdude250f

Posted 07 November 2012 - 09:14 AM

#9

Yamaha kid save yourself some time it's not needed to pull the head to swap cam chains just a tip to save a headache next time.

  • Swede73

Posted 07 November 2012 - 12:59 PM

#10

After 6 years I hope he has changed it. Just sayin

  • dgcars

Posted 07 November 2012 - 03:12 PM

#11

After 6 years I hope he has changed it. Just sayin


:lol:

  • yamahakid88

Posted 08 November 2012 - 05:47 AM

#12

Yamaha kid save yourself some time it's not needed to pull the head to swap cam chains just a tip to save a headache next time.

i pull the head to clean the carbon off the head, and make sure the valves are sealing




 
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.

Register Close
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.