ADVrider

Go Back   ADVrider > Bikes > GSpot > Parallel Universe
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 05-04-2011, 11:07 AM   #1
Corona OP
Dreaming of Dreaming
 
Corona's Avatar
 
Joined: May 2010
Location: Berkshire, United Kingdom
Oddometer: 100
Correct chain adjustment

I have recently noticed that I am getting some drive chain snatch when getting on the throttle. This is can be heard as a slight clank as the chain comes tight and a bit of a jerk in the movement of the bike.

Now the chain has about 4k miles on it and I have checked the slack. It is at about 40mm of slack when on the side stand and the manual indicates it should be between 35 and 45 mm.

Do other owners experience this behavior at normal chain tightness or should I put the rear wheel adjusters about it?
__________________
2010 BMW F800 GS
Farkles: Adv Spec Crash Bars, Adv Spec Bash Plate, Bark Busters w/ Storm Guards, CalSci Touring screen, Remus Ti exhuast
Current Tyre: Conti TK80

2005 CBR600F4i
Farkles: Hell braided brake lines
Current Tyre: Michelin Pilot Road 2
Corona is offline   Reply With Quote
Old 05-04-2011, 04:53 PM   #2
TheVelourFog
Adventurer
 
Joined: Jun 2010
Oddometer: 28
The chain should be at 35-45mm while on the center stand, not the side stand. Measuring on the side stand will give a false reading and will result in the chain being looser than it should be.
TheVelourFog is offline   Reply With Quote
Old 05-04-2011, 04:57 PM   #3
jussaral
Adventurer
 
Joined: Aug 2009
Oddometer: 29
Quote:
Originally Posted by TheVelourFog View Post
The chain should be at 35-45mm while on the center stand, not the side stand. Measuring on the side stand will give a false reading and will result in the chain being looser than it should be.
from the manual:

35...45 mm (Motorcycle with
no weight applied, supported
on its side stand)...
jussaral is online now   Reply With Quote
Old 05-04-2011, 05:02 PM   #4
The Griz
North Forest Rider
 
The Griz's Avatar
 
Joined: Nov 2008
Location: Minnesota
Oddometer: 3,780
Quote:
Originally Posted by Corona View Post
I have recently noticed that I am getting some drive chain snatch when getting on the throttle. This is can be heard as a slight clank as the chain comes tight and a bit of a jerk in the movement of the bike.

Now the chain has about 4k miles on it and I have checked the slack. It is at about 40mm of slack when on the side stand and the manual indicates it should be between 35 and 45 mm.

Do other owners experience this behavior at normal chain tightness or should I put the rear wheel adjusters about it?
Your chain is fine. The jerkiness you're experiencing is the nature of the the throttle control / fuel injection on this bike. Get a G2 Ergonomics Throttle Tamer and the Booster Plug and it will help kind of.

The chain slap against the swing arm is also unfortunately the way things are due to the fact that this bike has a very long swing arm and chain length. S'normal. The jerkiness is not due the the chain, it is due to the throttle control / fuel injection touchiness on this bike.
__________________
PAUL BUNYAN FOREST RIDERS MC
2013 KTM 300 XC-W
2014 KTM 690 Enduro R
The Griz is offline   Reply With Quote
Old 05-04-2011, 05:03 PM   #5
The Griz
North Forest Rider
 
The Griz's Avatar
 
Joined: Nov 2008
Location: Minnesota
Oddometer: 3,780
Quote:
Originally Posted by TheVelourFog View Post
The chain should be at 35-45mm while on the center stand, not the side stand. Measuring on the side stand will give a false reading and will result in the chain being looser than it should be.
Wrong.

The bike should be on its SIDE STAND when measuring chain tension.
__________________
PAUL BUNYAN FOREST RIDERS MC
2013 KTM 300 XC-W
2014 KTM 690 Enduro R
The Griz is offline   Reply With Quote
Old 05-04-2011, 05:28 PM   #6
soyanarchisto
Beastly Adventurer
 
soyanarchisto's Avatar
 
Joined: Sep 2005
Location: Sunny PDX
Oddometer: 3,444
Quote:
Originally Posted by TheVelourFog View Post
The chain should be at 35-45mm while on the center stand, not the side stand. Measuring on the side stand will give a false reading and will result in the chain being looser than it should be.
Yeah, this is fundamentally flawed since the bike doesn't come standard equipped with a center stand. Although it wouldnt surprise me if BMW did that.
soyanarchisto is offline   Reply With Quote
Old 05-04-2011, 05:46 PM   #7
The Griz
North Forest Rider
 
The Griz's Avatar
 
Joined: Nov 2008
Location: Minnesota
Oddometer: 3,780
__________________
PAUL BUNYAN FOREST RIDERS MC
2013 KTM 300 XC-W
2014 KTM 690 Enduro R
The Griz is offline   Reply With Quote
Old 05-04-2011, 07:39 PM   #8
Flashback
Mommys Lil Monster
 
Flashback's Avatar
 
Joined: Jul 2007
Location: Mariana Islands via Raleigh, NC
Oddometer: 3,079
Interesting. Didn't know that they didn't come with the center stand but I've always done chain adjustments using "tires on the ground" for measurements anyway.
__________________

Flashback is offline   Reply With Quote
Old 05-04-2011, 07:46 PM   #9
Flashback
Mommys Lil Monster
 
Flashback's Avatar
 
Joined: Jul 2007
Location: Mariana Islands via Raleigh, NC
Oddometer: 3,079
Quote:
Originally Posted by Corona View Post
I have recently noticed that I am getting some drive chain snatch when getting on the throttle. This is can be heard as a slight clank as the chain comes tight and a bit of a jerk in the movement of the bike.
Chains not adjusted properly. I'm kind of a stickler for having a chain adjusted to the sweet spot and nothing irks me more than a chain that's so slack that it jerks the bike when throttled up. I prefer a smooth transition and even though the throttle is a little jerky on the F8, when the chain is adjusted correctly throttling up from stop can be smooth as butter.

Plus I've found that getting the F8 front wheel off the ground is so much easier when torque is automatically and smoothly transferred to the rear when gas is applied instead of having that 'jerk'. Jerky application of torque can't be good for the transmission, chain, or sprockets.

Just be careful not to adjust the chain too tight. A too-tight chain puts excessive constant lateral pressure on wheel and transmission bearings. This in turn causes increased stress on those bearings and elevates the potential for premature failure.

When in doubt, make sure the chain is loose. BUT don't do what I did with one of my beater thumpers. I let the chain get so loose that it managed to actually slip the sprockets one time. What a mess that caused as things got all bound and locked up.
__________________


Flashback screwed with this post 05-04-2011 at 08:01 PM
Flashback is offline   Reply With Quote
Old 05-04-2011, 08:20 PM   #10
ride2little
MoveAlongNothingHere
 
ride2little's Avatar
 
Joined: Mar 2006
Location: Franklin, TN
Oddometer: 1,919
I too adjust the chain per he manual. That-is on the side-stand, no weight, 35-45mm.

And I too am a stickler for 'just the right' amount of slack.

And I TOO prefer it too loose rather than too tight (m/c chain...keep it clean).

But this bike is giving me more trouble in getting it there. It seems to be either too loose, so I tighten it up ever so slightly (or so i think) then it's too tight. Right now I hear the chain hitting the bottom of the swingarm when the going gets rough. I hate that.
Anyway, I need to tweak it a little toward the tighter-side of life. Wish me luck.

Between this and making sure of the proper tire pressures, this bike is HIGH-MAINTENANCE.
__________________
~MK~
BMWF800GS
KTM 400 EXC
AMA-262640
ride2little is offline   Reply With Quote
Old 05-04-2011, 08:35 PM   #11
dsrydr
Gnarly Adventurer
 
dsrydr's Avatar
 
Joined: Oct 2009
Location: Oklahoma City
Oddometer: 273
I agree there is a sweet spot where the chain doesn't slap and is still not too tight. Mine used to be there and it was sweet. Since I have changed tires it is loose again, I need to tighten it.
dsrydr is offline   Reply With Quote
Old 05-04-2011, 09:02 PM   #12
The Griz
North Forest Rider
 
The Griz's Avatar
 
Joined: Nov 2008
Location: Minnesota
Oddometer: 3,780
Quote:
Originally Posted by Flashback View Post
Chains not adjusted properly. I'm kind of a stickler for having a chain adjusted to the sweet spot and nothing irks me more than a chain that's so slack that it jerks the bike when throttled up. I prefer a smooth transition and even though the throttle is a little jerky on the F8, when the chain is adjusted correctly throttling up from stop can be smooth as butter.

Plus I've found that getting the F8 front wheel off the ground is so much easier when torque is automatically and smoothly transferred to the rear when gas is applied instead of having that 'jerk'. Jerky application of torque can't be good for the transmission, chain, or sprockets.

Just be careful not to adjust the chain too tight. A too-tight chain puts excessive constant lateral pressure on wheel and transmission bearings. This in turn causes increased stress on those bearings and elevates the potential for premature failure.

When in doubt, make sure the chain is loose. BUT don't do what I did with one of my beater thumpers. I let the chain get so loose that it managed to actually slip the sprockets one time. What a mess that caused as things got all bound and locked up.
Actually, his chain is adjusted properly. It's at 40mm. The spec is 35-45mm. He's right in the middle. Perfect.

Since his chain is adjusted perfectly I still believe that in his case the jerkiness he is experiencing is simply the nature of "the beast's" fuel injection / throttle control system.

He could try and tighten the chain up 5mm from 40mm to the minimum 35mm, but should not go any tighter than that or it will cause undue wear on the chain and sprockets.
__________________
PAUL BUNYAN FOREST RIDERS MC
2013 KTM 300 XC-W
2014 KTM 690 Enduro R
The Griz is offline   Reply With Quote
Old 05-04-2011, 09:13 PM   #13
The Griz
North Forest Rider
 
The Griz's Avatar
 
Joined: Nov 2008
Location: Minnesota
Oddometer: 3,780
Quote:
Originally Posted by Corona View Post
I have recently noticed that I am getting some drive chain snatch when getting on the throttle. This is can be heard as a slight clank as the chain comes tight and a bit of a jerk in the movement of the bike.

Now the chain has about 4k miles on it and I have checked the slack. It is at about 40mm of slack when on the side stand and the manual indicates it should be between 35 and 45 mm.

Do other owners experience this behavior at normal chain tightness or should I put the rear wheel adjusters about it?
To actually answer your question, Corona, I too experience what you speak of. I always have since day 1. Snatchiness, jerkiness, whatever you want to call it, it's there. The best one can do is keep the chain adjusted on the tighter side to 35mm, install a G2 Throttle Tamer, and install a Booster Plug. If you do these three things the power delivery / drive train will react/feel much smoother. Cheers.
__________________
PAUL BUNYAN FOREST RIDERS MC
2013 KTM 300 XC-W
2014 KTM 690 Enduro R
The Griz is offline   Reply With Quote
Old 05-04-2011, 11:48 PM   #14
Corona OP
Dreaming of Dreaming
 
Corona's Avatar
 
Joined: May 2010
Location: Berkshire, United Kingdom
Oddometer: 100
Quote:
Originally Posted by The Griz View Post
To actually answer your question, Corona, I too experience what you speak of. I always have since day 1. Snatchiness, jerkiness, whatever you want to call it, it's there. The best one can do is keep the chain adjusted on the tighter side to 35mm, install a G2 Throttle Tamer, and install a Booster Plug. If you do these three things the power delivery / drive train will react/feel much smoother. Cheers.
The Griz, the thing that prompted my question is that the bikes current behavior and the noise has changed from what it was 1k miles ago. Yeah it still had a rather snatchy throttle but chain slap noise wasn't present. In that time I have also changed the tyres so maybe I did not set the chain slack back to how it was when it came from the factory.

The jerk is also different from the throttle aggressiveness and would happen when going off and on the power at high gears (say 5 or 6) where the gear would normally have tamed the throttles harshness.

Maybe I just need to tighten it a touch?
__________________
2010 BMW F800 GS
Farkles: Adv Spec Crash Bars, Adv Spec Bash Plate, Bark Busters w/ Storm Guards, CalSci Touring screen, Remus Ti exhuast
Current Tyre: Conti TK80

2005 CBR600F4i
Farkles: Hell braided brake lines
Current Tyre: Michelin Pilot Road 2
Corona is offline   Reply With Quote
Old 05-05-2011, 04:32 AM   #15
JRWooden
Beastly Adventurer
 
Joined: Jul 2008
Location: The great state of confusion
Oddometer: 4,206
One think I think BMW screwed up on here is the tread pitch on the adjuster bolts - from my experience one "flat" i.e. 1/6 of a turn, results in a change in the slack of 5mm or more .... making it dang hard to find the sweet spot....

Most of the bikes I owned before were smaller displacement and used the "snail" type adjusters which I really miss
JRWooden is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
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 On

Forum Jump


Times are GMT -7.   It's 01:18 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014