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Old 11-03-2010, 06:42 PM   #1
seldredg OP
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New airhead owner, hello: question about wheel turning in neutral

Hi all. I have a 1985 R100-ish airhead. I noticed wen the bike is idling on the stand in neutral, the rear wheel turns. It can be stopped with foot or hand. Clutch lever and arm have play in them. Is there something else to adjust? Or is this normal.
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Old 11-03-2010, 07:46 PM   #2
bmwrench
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It's normal. The gear oil is driving the gears-sort of an accidental viscous coupling.
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Old 11-03-2010, 08:17 PM   #3
seldredg OP
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Thanks. I hoped it was something like that. Had an R90S for a number of years and never noticed this. Scott
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Old 11-04-2010, 10:17 AM   #4
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Even some older chain driven bikes do that.
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Old 11-04-2010, 01:28 PM   #5
danedg
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...my R60 does it....
means there's oil in it.....
just don't let the 3 year old stick his fingers in it....he'll try!
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Old 11-04-2010, 02:49 PM   #6
Country Doc
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My R100GS did it, my R75/6 and R75/5 do not. .

dc
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Old 11-07-2010, 12:39 PM   #7
R11STEW
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Uhh, Ive owned many a bike and the all did that.
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Old 11-07-2010, 12:55 PM   #8
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Quote:
Originally Posted by R11STEW
Uhh, Ive owned many a bike and the all did that.
+1
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Old 11-07-2010, 04:21 PM   #9
kraut.burner
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Quote:
Originally Posted by bmwrench
It's normal. The gear oil is driving the gears-sort of an accidental viscous coupling.
Quote:
Originally Posted by danedg
means there's oil in it.....
I still don't see how that would cause the wheel to spin.... I always thought is was just the vibration
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Old 11-07-2010, 06:59 PM   #10
bmwrench
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In neutral, all the gears are placed so that they can't drive, but the input and intermediate shafts still turn, as well as the gears on the output shaft. The oil between the output gearS and shaft can cause the shaft to rotate. This varies depending on the viscosity of the oil and the fit of the gear to the shaft-and probably how much drag there is in the RDU. Some bikes can spin the rear wheel surprisingly fast, but just touching the rear brake or the side of the tire with your boot will stop it. I don't think I'd ask a 3 year-old to try it, though.

"Then he'll stick his fingers in the fan" John Sebastian
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Old 11-07-2010, 07:25 PM   #11
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Quote:
Originally Posted by kraut.burner
I still don't see how that would cause the wheel to spin.... I always thought is was just the vibration
Heck most manual cars will turn the rear wheels while running in neutral.

Ditto tractors.

As mentioned there is a certain amount of drag between spinning plates of metal with oil between them.
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Old 11-07-2010, 07:44 PM   #12
kraut.burner
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Quote:
Originally Posted by bmwrench
In neutral, all the gears are placed so that they can't drive, but the input and intermediate shafts still turn, as well as the gears on the output shaft. The oil between the output gearS and shaft can cause the shaft to rotate. This varies depending on the viscosity of the oil and the fit of the gear to the shaft-and probably how much drag there is in the RDU. Some bikes can spin the rear wheel surprisingly fast, but just touching the rear brake or the side of the tire with your boot will stop it. I don't think I'd ask a 3 year-old to try it, though.

"Then he'll stick his fingers in the fan" John Sebastian
Heck, you learn something new everyday.... Thanks
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Old 11-08-2010, 09:50 AM   #13
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I don't think I'd ask a 3 year-old to try it, though.....

I didn't ask him to do anything...he was just fascinated by having that rear wheel spin, with the bike idling on the centerstand.....couldn't help himself...
... Just like Ol' Uncle Dan!....

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