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.

Calendar Contest Voting is now CLOSED. Results to be posted shortly.


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 15 May 2001
Registered Users
HUBB regular
 
Join Date: Dec 2000
Location: Bristol
Posts: 23
Chain Adjustment

On a 1988 XT600 Tenere (3AJ),

Just a quick question, I am a big guy and have the suspension set on the firm side which I like, I have no problems with the handling, but I do have problems with the chain adjustment.

I pressume you measure the chain tension with myself sat on the bike, the problem I have that with the type of adjustment on the bike the chain is either too tight or too lose, I can't set it in between because of the adjuster.

Is it better to have it tight or lose, is there something I can do about this?

Do I need to by a new chain and sprockets etc?

Any ideas greatly appreciated.

Oh and another question - I would like to make the throttle shorter, is there any way I can use a quick throttle type device, such as they use in Motocross, if so where can I find one of these?

Scott

[This message has been edited by sjbarrow (edited 15 May 2001).]
Reply With Quote
  #2  
Old 15 May 2001
Grant Johnson's Avatar
HU Founder
Veteran HUBBer
 
Join Date: Dec 1997
Location: Vancouver BC Canada
Posts: 4,471
To clarify this, YOU have no effect on the chain tension whatsoever.

What matters is that the chain is never under any tension at any point in the suspension travel. Too tight can destroy the bearing behind the primary sprocket in your transmission, so you NEVER want too tight. Always err on the loose side.

The swing arm pivots from a point behind the primary sprocket, so the wheel travels a different arc than the chain. This ends up meaning that when the front sprocket is in a straight line with the swingarm pivot AND the rear axle, the chain is theoretically at it's tightest point, and this is where you set the correct chain tension. This can be tricky, so many manufacturers give instructions to set the chain under various scenarios, usually at rest on the sidestand and with x tension somewhere.

If in doubt, here's how to get it right.

Compress the suspension till all three are in line as above, then use a tiestrap or rope or something around the frame / seat and wheel to lock the wheel in place. (Easiest may be to remove the shock) Be VERY sure front sprocket, swing arm pivot and rear axle are in a straight line.

Put the bike on centerstand or a box so the rear wheel is in the air.

Then spin the rear wheel slowly, checking the chain every few inches for tension. You will discover that the tension will VARY! Chains stretch unevenly, and sprockets are often not perfectly round. Find the TIGHTEST point, then carefully adjust the chain so that you have 1" to 1.25" (25 - 30mm) slack.

What I then do is figure out an easy check with the bike back on the ground and the suspension in normal relaxed mode. Find the tightest spot in the chain, and check the slack from the chain to somewhere on the swingarm that's easy to remember, and you're done.

If you can lift the chain off the rear sprocket at the rearmost point any amount over 1/8" or 3mm the chain is probably toast, replace it asap. If unsure your dealer will show you how to tell, and also if your sprockets are bad and need replacing. ANY sign of "hooking" i.e. the sprocket teeth are not exactly the same profile on each side, they are done.

Re throttle, I don't know, but your dealer should. This should be possible. Anybody?

------------------
Grant Johnson

Share the Dream!
at: www.HorizonsUnlimited.com


__________________
Grant Johnson

Seek, and ye shall find.

------------------------

Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
Reply With Quote
  #3  
Old 16 May 2001
Registered Users
HUBB regular
 
Join Date: Dec 2000
Location: Bristol
Posts: 23
Cheers for that, I will try adjusting it again, it would seem I would have to leave it on the loose side, but it seems much to slack. One notch up and the chains too tight.

I might invest in new chain and sprockets as a precaution, the sprockets are beginning to look a little worn anyway.
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


 
 



HU DVD Spring Special!

Buy the Achievable Dream Collectors Set and get Road Heroes Part 1 FREE!

Achievable Dream - The Whole Enchilada!

Cooped up indoors in crap weather? Binge watch over 20 hours of inspiring, informative and entertaining stories and tips from 150 travellers! Check it out at the HU Store! Remember to order them both and use Coupon Code 'BoxSet+' on your order when you checkout.


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 13:14.