Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech

Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 16 Jul 2008
Registered Users
Veteran HUBBer
 
Join Date: Sep 2006
Location: Edinburgh
Posts: 106
Broken Timing chain?

So the bike won't start. ('89 3AJ Tenere) This wasn't too much of a worry until I scared myself with a huge backfire when cranking it over. Then, thinking back to how the starter motor didn't seem to be having to work as hard as normal, I have come to the conclusion that the timing chain has snapped. It's either that or there's a valve stuck upon, right?

So, while I ponder whether I'm going to brave the bottom end and do it myself, a couple of questions for the assembled knowledge:

Is the XT600 engine an interference engine, and if so will being cranked a load of times with a snapped chain have damaged the piston/valves?

Are there any other jobs I'd be as well doing while I do the timing chain?

Cheers.
Reply With Quote
  #2  
Old 16 Jul 2008
Registered Users
Veteran HUBBer
 
Join Date: Jan 2001
Location: Stockholm
Posts: 651
Oeps

Yes it is. Interference engine.

Easiest way to verify; open valve covers and check:
A - When the engine is very carefully cranked by hand, are the rockers and valves moving?
B - Does any of the valve(s) have (very) excessive play?

If A - timing chain OK, if not A - chain broken
If B - valve(s) stuck open

Bottom end does not need to be opened to replace the timing chain - only remove LH cover and rotor. Bottom end of the chain lives there. And of course the top end needs to come off.

Auke
__________________
Auke
http://aukemarieke.blogspot.com
Reply With Quote
  #3  
Old 16 Jul 2008
bacardi23's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,523
I just had my engine serviced because the cam chain also broke while i was at 50mph... both my 2 intake valves were bent....luckily nothing else got damaged because of that..

One thing...do not forget to align the timing points if the chain did brake. It is crucial or you might end up having to reopen the engine once more.

If I were you I'd had the bottom end checked for any other possible damage it might have happened (as I did).

I only went for the mechanic because he's a friend (yes, it's a small island) because he has a little more knowledge than me AND has all the tools needed..


Later!

Vando

Last edited by bacardi23; 16 Jul 2008 at 17:05.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
XR600 timing chain dramas Stirlo Honda Tech 1 24 Aug 2006 22:22
Setting the timing Chain gwel Yamaha Tech 4 25 Apr 2006 23:15
Rear Shock Linkage Arm Broken Broken Andy White KTM Tech 2 30 Jan 2006 03:19
timing chain gwel Yamaha Tech 3 28 Sep 2005 02:53
Timing chain replacement through top end chris Aus Yamaha Tech 7 2 Sep 2005 04:15

 
 


HU DVD Summer Special!

Now that summer is here, get On the Road! Take 30% off the Achievable Dream - On the Road! 2-DVD set until August 31 only. Get On the Road! Learn the tips to staying healthy, happy and secure on your motorcycle adventure!

Our veteran travellers share their tips (and great stories) for staying healthy, happy and secure on your motorcycle adventure.

"A fantastic, informative and inspirational DVD."

"It's brilliant - thank you very much!"

Check it out at the HU Store! Remember to use Coupon Code 'ONTHEROAD' on your order when you checkout.


Renedian Adventures


Renedian Adventures

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!


New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.


Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!




All times are GMT +1. The time now is 23:23.