Yamaha Discussions about Yamaha ATVs.

??? snapped timing chain ???help!

Thread Tools
 
Search this Thread
 
Old Jun 25, 2004 | 10:20 PM
  #1  
400exKiller990's Avatar
Thread Starter
|
Pro Rider
Joined: Aug 2002
Posts: 216
Likes: 0
Default ??? snapped timing chain ???help!

just put a hot cam in and was on about my 4th ride, it was running great full power and the timing chaain let go.
anyone know how many headaches i am in for and how much on is? also will it be very difficult to replace it? how much is in volved ?how far in the motor do oyu have to go?
 
Reply
Old Jun 25, 2004 | 11:08 PM
  #2  
420EX's Avatar
Pro Rider
Joined: Sep 2003
Posts: 921
Likes: 0
Default ??? snapped timing chain ???help!

you should be able to find one on ebay pretty cheap. Sorry but thats all i can help you with.
 
Reply
Old Jun 26, 2004 | 05:12 AM
  #3  
400exKiller990's Avatar
Thread Starter
|
Pro Rider
Joined: Aug 2002
Posts: 216
Likes: 0
Default ??? snapped timing chain ???help!

anyone?
 
Reply
Old Jun 26, 2004 | 06:04 AM
  #4  
MickDundee's Avatar
Weekend Warrior
Joined: Jun 2004
Posts: 4
Likes: 0
Default ??? snapped timing chain ???help!

lots of time and parts but it shouldnt be to hard to fix. After removing broken cam chain, youll need to go in through the right hand side of the motor, do a compression test to check for bent valves. If the comp is good then replace the chain and re-time the cam timing. Peice of ****.
 
Reply
Old Jun 26, 2004 | 03:09 PM
  #5  
400exKiller990's Avatar
Thread Starter
|
Pro Rider
Joined: Aug 2002
Posts: 216
Likes: 0
Default ??? snapped timing chain ???help!

right side where? how do you do a comp test?
 
Reply
Old Jun 26, 2004 | 03:10 PM
  #6  
400exKiller990's Avatar
Thread Starter
|
Pro Rider
Joined: Aug 2002
Posts: 216
Likes: 0
Default ??? snapped timing chain ???help!

y would i have a bent valve?
 
Reply
Old Jun 26, 2004 | 05:11 PM
  #7  
sixsixT's Avatar
Extreme Pro Rider
Joined: May 2002
Posts: 3,286
Likes: 1
Default ??? snapped timing chain ???help!

Originally posted by: 400exKiller990
y would i have a bent valve?
Because the piston more than likely hit the valves.

I would pull the head, your probably going to need valves and it will be easier to put in the new chain. You need to remove the left side case and more than likely the flywheel, I have gotten the timing chain off and back on tho without removing the flywheel.
 
Reply
Old Jun 27, 2004 | 02:27 AM
  #8  
Trinity748's Avatar
Pro Rider
Joined: Feb 2004
Posts: 259
Likes: 0
Default ??? snapped timing chain ???help!

Good God, There is no way that it's going to be easy to fix. From what I understand when the chain breaks that will cause piston to come up and smash the valves when there open. That ether bends them over to get smashed into the head again, or they will get blasted up in the the intake or exhaust manifold to do more damage there. I could be missing somethings but I'm pretty sure that the motor has to be completly rebuilt when this happens.
Good Luck...
 
Reply
Old Jun 30, 2004 | 10:41 PM
  #9  
400exKiller990's Avatar
Thread Starter
|
Pro Rider
Joined: Aug 2002
Posts: 216
Likes: 0
Default ??? snapped timing chain ???help!

how u get the flywheel off? valves barley barley hit the piston
not a bad break at all
 
Reply
Old Jul 1, 2004 | 09:36 AM
  #10  
sAyIt_fmf's Avatar
Pro Rider
Joined: Nov 1999
Posts: 1,538
Likes: 0
Default ??? snapped timing chain ???help!

You need to get a service manual...this is not shooting in the dark...you are going to have time the engine again...valves WILL be ruined or at least cupped. unless by some chance you were able to get the motor to stop spinning as soon as the damage occured.

 
Reply



All times are GMT -5. The time now is 02:40 AM.