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Is this normal?

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TCFA
Trackday Trickster



Joined: 25 Aug 2013
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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
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Commuter_Tim
World Chat Champion



Joined: 09 May 2013
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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.
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The above post is most likely nonsensical.

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Last edited by Commuter_Tim on 23:55 - 20 Feb 2015; edited 1 time in total
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Shaft
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Joined: 27 Dec 2010
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PostPosted: 23:54 - 20 Feb 2015    Post subject: Reply with quote
Yep
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TCFA
Trackday Trickster



Joined: 25 Aug 2013
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PostPosted: 00:02 - 21 Feb 2015    Post subject: Reply with quote
ta muchly
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316lad
Borekit Bruiser



Joined: 12 Nov 2014
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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.
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TCFA
Trackday Trickster



Joined: 25 Aug 2013
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PostPosted: 01:58 - 21 Feb 2015    Post subject: Reply with quote
good to hear Smile
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weasley
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Joined: 16 Oct 2010
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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.
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yen_powell
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Joined: 22 Jun 2008
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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.
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captain_ramshackle
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Joined: 26 Oct 2014
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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
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Andy_Pagin
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Joined: 08 Nov 2010
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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.
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weasley
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Joined: 16 Oct 2010
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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.
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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?
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