Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


Vibration

Reply to topic
Bike Chat Forums Index -> The Workshop
View previous topic : View next topic  
Author Message

DaddyStu
Trackday Trickster



Joined: 19 Jan 2023
Karma :

PostPosted: 13:27 - 04 Jun 2023    Post subject: Vibration Reply with quote

Getting some seat vibro at speed following chain adjustment. The scale reads the same both sides and the sag(?) is within suggested range.

It's not severe but my prostrate has lodged a formal complaint.

Anything else I should be checking?
____________________
Daddystu
Zontes 125-G1 (part-ex'd). Yamaha Tracer 700.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Islander
World Chat Champion



Joined: 05 Aug 2012
Karma :

PostPosted: 13:36 - 04 Jun 2023    Post subject: Reply with quote

Wheel alignment?
 Back to top
View user's profile Send private message You must be logged in to rate posts

stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
Karma :

PostPosted: 16:59 - 04 Jun 2023    Post subject: Reply with quote

Front sprocket securely bolted on?

Sprocket carrier bearing in good order?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
 Back to top
View user's profile Send private message You must be logged in to rate posts

sickpup
Old Timer



Joined: 21 Apr 2004
Karma :

PostPosted: 17:54 - 04 Jun 2023    Post subject: Reply with quote

Check for stiff links and if your rear sprockets is actually round.
 Back to top
View user's profile Send private message You must be logged in to rate posts
dave001 This post is not being displayed because the poster is banned. Unhide this post / all posts.

sickpup
Old Timer



Joined: 21 Apr 2004
Karma :

PostPosted: 19:02 - 04 Jun 2023    Post subject: Reply with quote

dave001 wrote:
bet you dint look for the tightest spot on the chain before adjusting


Would that be caused by an out of round rear sprocket? Think about it...
 Back to top
View user's profile Send private message You must be logged in to rate posts

DaddyStu
Trackday Trickster



Joined: 19 Jan 2023
Karma :

PostPosted: 19:27 - 04 Jun 2023    Post subject: Reply with quote

Thanks all. Yes I checked the chain over when i relubed it so sure its not a stuck link. Not sure about the front sprocket - to check would require some disassembly so will check when i've some time.

Wheel alignment would seem the likely culprit. I was under the impression doing up the adjusters the same on both sides accounted for that. Web-search would have me using strings and tubes to check - or I could wait until the service due this month.
____________________
Daddystu
Zontes 125-G1 (part-ex'd). Yamaha Tracer 700.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

WD Forte
World Chat Champion



Joined: 17 Jun 2010
Karma :

PostPosted: 23:47 - 04 Jun 2023    Post subject: Reply with quote

Feck all info so making guesses.

I'll assume your 'sag' is free play, but how much have you allowed it?
and how/where did you measure it?
I'm also assuming its pretty new so has low-ish miles
I'm also going to assume/guess as it is a sudden symptom,
you've just over tightened it a bit.

I'd try backing it off half a turn on each adjuster, maybe even 1 complete turn as I'm ( still) guessing the adjusters have 8mm threads and will have pitch of 1.25 to 1.5mm so wont slacken the chain very much.
____________________
bikers smell of wee
 Back to top
View user's profile Send private message You must be logged in to rate posts

DaddyStu
Trackday Trickster



Joined: 19 Jan 2023
Karma :

PostPosted: 00:09 - 05 Jun 2023    Post subject: Reply with quote

WD Forte wrote:
Feck all info so making guesses.

I'll assume your 'sag' is free play, but how much have you allowed it?
and how/where did you measure it?
I'm also assuming its pretty new so has low-ish miles
I'm also going to assume/guess as it is a sudden symptom,
you've just over tightened it a bit.

I'd try backing it off half a turn on each adjuster, maybe even 1 complete turn


Newish yes - 2700 miles. 3000 mile service coming up.

Yes free play - pull down point to push-up point 35mm which is ok
according to the manual.

Not talking bone-jarring/unrideable just not quite as smooth a ride as before the adjustment.

Wheel alignment and slight overtightening do seem the most likely explanations.
____________________
Daddystu
Zontes 125-G1 (part-ex'd). Yamaha Tracer 700.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Pete.
Super Spammer



Joined: 22 Aug 2006
Karma :

PostPosted: 06:38 - 05 Jun 2023    Post subject: Reply with quote

Slacken off axle, loosen adjusters 1/4 turn, bash tyre forwards, re-tighten axle and ride it. If it is not the same then you had it too tight, or your carrier bearing is shot.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
 Back to top
View user's profile Send private message Visit poster's website You must be logged in to rate posts

MCN
Super Spammer



Joined: 22 Jul 2015
Karma :

PostPosted: 00:06 - 08 Jun 2023    Post subject: Reply with quote

The rear sprocket may be out-of-round. Common thing.
You therefore need to adjust the slack in the chain to be at the the tightest position when the wheel is rotated.
If its substantial, you can watch the slack on the lower part of the chain change as the wheel rotates.

TLDR
The adjustment was checked at the slack part of rotation.
So the chain will go banjo when the slack is taken up byt the sprocket.
____________________
Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> The Workshop All times are GMT + 1 Hour
Page 1 of 1

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 

Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.07 Sec - Server Load: 0.03 - MySQL Queries: 17 - Page Size: 72.08 Kb