My chain keeps loosening off - Honda RC51 Forum : RC51 Motorcycle Forums
 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 06-13-2014, 04:51 PM Thread Starter
Lifetime Premium
 
Polarbear's Avatar
 
Join Date: Feb 2012
Location: scotland, UK
Posts: 1,108
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
My chain keeps loosening off

as above. I noticed it was really slack when me and my bro (nc30) were out on our last ride. So i tightened it and everything feels gr8. ive only done 100 or so miles since then and gradually its starting to look slightly slack again.

I used all the correct Torque settings for the axle nut too, all done by the book!

Honda SP1.5 owner
Polarbear is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 06-13-2014, 04:55 PM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
Take pictures of your adjusters on each side. (For my reference)

Pull the adjuster bolts all of the way out of the swing arm and check their condition as well as the threaded holes in the swing arm.



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #3 of 10 (permalink) Old 06-13-2014, 05:01 PM Thread Starter
Lifetime Premium
 
Polarbear's Avatar
 
Join Date: Feb 2012
Location: scotland, UK
Posts: 1,108
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
the adjuster bolts were replaced as part of my winter project. theyre brand spanking new

Honda SP1.5 owner
Polarbear is offline  
 
post #4 of 10 (permalink) Old 06-13-2014, 05:01 PM
Senior Member
 
kwtoxman's Avatar
 
Join Date: Oct 2012
Location: Canada
Posts: 2,146
Mentioned: 11 Post(s)
Quoted: 109 Post(s)
Before going crazy with diagnoses, start with the simple stuff that is the common culprit.

First, you know there is supposed to be slack. More slack than many people think and do when adjusting, which when it is too tight exponentially wears out a chain and sprockets. For many the most common cause of chain stretch is that the chain is being tightened too much when adjusted.

Next, if the chain worn out to the replace area of the adjuster guide, yes a chain can stretch faster. Replace then.

Last edited by kwtoxman; 06-13-2014 at 05:53 PM.
kwtoxman is online now  
post #5 of 10 (permalink) Old 06-13-2014, 05:03 PM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
Quote:
Originally Posted by Polarbear View Post
the adjuster bolts were replaced as part of my winter project. theyre brand spanking new
How do they fit? Are they tight fit or lose fit? Jamb nuts secure?

Just thinking of the obvious.

Also, make sure your counter sprocket is tight too....seen those loosen up and cause troubles.



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #6 of 10 (permalink) Old 06-13-2014, 05:05 PM Thread Starter
Lifetime Premium
 
Polarbear's Avatar
 
Join Date: Feb 2012
Location: scotland, UK
Posts: 1,108
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
counter sprocket?

Honda SP1.5 owner
Polarbear is offline  
post #7 of 10 (permalink) Old 06-13-2014, 05:35 PM
Lifetime Premium
 
James_03_rc's Avatar
 
Join Date: Sep 2010
Location: Newport NC
Posts: 2,697
Mentioned: 5 Post(s)
Quoted: 80 Post(s)
30 to 35 mm of slack per the service manual. Some run a loose as 40 mm, commonly for track use.

Sent from Motorcycle.com App
James_03_rc is offline  
post #8 of 10 (permalink) Old 06-13-2014, 08:19 PM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
Quote:
Originally Posted by Polarbear View Post
counter sprocket?
Counter shaft, counter, front sprocket.......all the same to me.....just don't go all crazy or some folks might come off like a fucking baseball bat



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #9 of 10 (permalink) Old 06-14-2014, 02:25 PM
Moderator
 
SubSailor's Avatar
 
Join Date: Oct 2008
Location: Sarasota, FL
Posts: 6,461
Mentioned: 24 Post(s)
Quoted: 88 Post(s)
If necessary, better to err on the too loose side than too tight side with chain slack. Though correct adjustment is the preference.
Also, chains don't stretch. They wear. Specifically the roller bushings.
When the bushing wear, the center-center distance increases causing increasing force on the side lobes of the sprocket teeth.
This why a worn out chain causes worn sprockets with a hook shape in the teeth.
Clean and lube the chain often to remove road grit, which can wear the O-rings. Usually around every 600 miles.
SubSailor is offline  
post #10 of 10 (permalink) Old 06-15-2014, 09:50 AM
Senior Member
 
innovativems's Avatar
 
Join Date: Mar 2014
Posts: 291
Mentioned: 0 Post(s)
Quoted: 16 Post(s)
a worn chain can be stretched in parts of the chain so it's within spec when you set it, then as it rotates, it hits a lose section
innovativems is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome