Help & FAQs    Search BCF    Members    Groups    Events Calendar
Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


Is this normal?

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

TCFA
Trackday Trickster



Joined: 25 Aug 2013
Karma :
PostPosted: 23:47 - 20 Feb 2015    Post subject: Is this normal? Reply with quote
When I put bike on centre stand tonight, started it up, it's in neutral, and yet there rear wheel gets drive
____________________
Then: Kawasaki ZZR250 > Suzuki Across 250 > Suzuki SV650 > Honda CB750
Now: Honda CBR600F and Triumph Tiger 800 XRT
 Back to top
View user's profile Send private message You must be logged in to rate posts

Commuter_Tim
World Chat Champion



Joined: 09 May 2013
Karma :
PostPosted: 23:53 - 20 Feb 2015    Post subject: Re: Is this normal? Reply with quote
TCFA wrote:
When I put bike on centre stand tonight, started it up, it's in neutral, and yet there rear wheel gets drive


Yes, read on here, and other biker forums, somewhat of a centrifugal effect of the oil spinning in the engine with just enough drive to move the opposing side, but can stop with light finger resistance.

Not sure if that is actually true, but have had it on the 3 bikes I've owned, and seen it on plenty more, none of those bikes ever blew up. Thumbs Up

Also I found on all mine, once the engine oil warmed up, and subsequently thinned out, the rear wheel stops spinning in neutral, but most of the time I've already set off by then.
____________________
The above post is most likely nonsensical.

I ride a Bandit 600... badly.

Last edited by Commuter_Tim on 23:55 - 20 Feb 2015; edited 1 time in total
 Back to top
View user's profile Send private message You must be logged in to rate posts

Shaft
World Chat Champion



Joined: 27 Dec 2010
Karma :
PostPosted: 23:54 - 20 Feb 2015    Post subject: Reply with quote
Yep
____________________
Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

TCFA
Trackday Trickster



Joined: 25 Aug 2013
Karma :
PostPosted: 00:02 - 21 Feb 2015    Post subject: Reply with quote
ta muchly
____________________
Then: Kawasaki ZZR250 > Suzuki Across 250 > Suzuki SV650 > Honda CB750
Now: Honda CBR600F and Triumph Tiger 800 XRT
 Back to top
View user's profile Send private message You must be logged in to rate posts

316lad
Borekit Bruiser



Joined: 12 Nov 2014
Karma :
PostPosted: 01:09 - 21 Feb 2015    Post subject: Reply with quote
As said before;
Your rear wheel bearings are in excellent shape and the wheel is being coaxed to fall forward by the engine's cylinder power moving forwards on its power stroke.

Machined parts - in good condition and nicely lubed and set up - tend to all want to go the same way; that's why we'll get to Mars one day.

No adjustment necessary - sounds like a nice and healthy bike.
 Back to top
View user's profile Send private message You must be logged in to rate posts

TCFA
Trackday Trickster



Joined: 25 Aug 2013
Karma :
PostPosted: 01:58 - 21 Feb 2015    Post subject: Reply with quote
good to hear Smile
____________________
Then: Kawasaki ZZR250 > Suzuki Across 250 > Suzuki SV650 > Honda CB750
Now: Honda CBR600F and Triumph Tiger 800 XRT
 Back to top
View user's profile Send private message You must be logged in to rate posts

weasley
World Chat Champion



Joined: 16 Oct 2010
Karma :
PostPosted: 09:46 - 21 Feb 2015    Post subject: Reply with quote
Here's what is really happening. It is an effect called 'viscous coupling'. In the gearbox the gears are constantly meshed but only the selected gear is locked to its shaft to provide drive to the wheel. In neutral, no gear is locked to the shaft, but the drag of the oil between the gear and its shaft allows a little torque transfer to happen. The effect is greater when cold, due to the oil being more viscous. Bikes are often more difficult to push about in gear, with the clutch in, for the same reason (viscous coupling across the wet clutch when open). It is also the reason for the 'clunk' when you select first (again, worse when cold).

Yes, normal.
____________________
Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE
 Back to top
View user's profile Send private message You must be logged in to rate posts

yen_powell
World Chat Champion



Joined: 22 Jun 2008
Karma :
PostPosted: 09:48 - 21 Feb 2015    Post subject: Reply with quote
It's just God's way of telling you the rear brake isn't quite seized properly yet.
____________________
Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits
 Back to top
View user's profile Send private message You must be logged in to rate posts

captain_ramshackle
Borekit Bruiser



Joined: 26 Oct 2014
Karma :
PostPosted: 10:59 - 21 Feb 2015    Post subject: Re: Is this normal? Reply with quote
TCFA wrote:
When I put bike on centre stand tonight, started it up, it's in neutral, and yet there rear wheel gets drive


I ended up asking a similar question when I first saw it happen on my bike. WTF is going on here? Is neutral broken.

Got the same answer as everyone else is giving
 Back to top
View user's profile Send private message You must be logged in to rate posts

Andy_Pagin
World Chat Champion



Joined: 08 Nov 2010
Karma :
PostPosted: 11:43 - 21 Feb 2015    Post subject: Reply with quote
weasley wrote:
It is also the reason for the 'clunk' when you select first (again, worse when cold).Yes, normal.
I thought that was because Yamaha were rubbish at designing gearboxes.
____________________
They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

weasley
World Chat Champion



Joined: 16 Oct 2010
Karma :
PostPosted: 13:16 - 21 Feb 2015    Post subject: Reply with quote
Andy_Pagin wrote:
weasley wrote:
It is also the reason for the 'clunk' when you select first (again, worse when cold).Yes, normal.
I thought that was because Yamaha were rubbish at designing gearboxes.


That just gives the Yamahas a more characterful clunk.
____________________
Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE
 Back to top
View user's profile Send private message You must be logged in to rate posts
Old Thread Alert!

The last post was made 11 years, 250 days ago. Instead of replying here, would creating a new thread be more useful?
  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: 0.06 Sec - Server Load: 0.6 - MySQL Queries: 13 - Page Size: 68.22 Kb