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Old 04-06-2021, 07:08 PM   #1
superhawk
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rear wheel spin on the stand

I have a 2009 sv650s trackbike. I was doing a light cleaning on the chain and I noticed that the rear wheel rotation felt stiff. With a good spin by hand i can only get one revolution out of it. I've had bikes where I could get almost 2 rotations.
The chain is aligned and has the correct free play for a track bike. Everything is torqued to spec. I pulled the caliper off and there was no affect on the spin. I did notice a very slight kinks in the chain ( new kit on order) but no tight spots. There is no side to side play in the wheel, but new bearing will be ordered anyway. I will check the countershaft rotation when I do the chain kit swap Any Ideas what could be the culprit?
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Old 04-06-2021, 07:29 PM   #2
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IIRC with my old SV race bike it was the same. I had a 180 conversion for the rear and the spacers were a pretty tight fit with the dust seals.

I also don't think i've had a bike that I could spin the rear more than 1x..

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Old 04-06-2021, 08:55 PM   #3
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Each bike I've had is different.

Let's see what it could be:
1. Brake pads rubbing
2. Chain friction
3. Countershaft friction
4. Wheel bearings worn out
5. Wheel bearings seated too deeply or internal spacer collapsed causing too much preload on bearings.
6. Wheel bearing seals friction
7. Race wheels are too light
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Old 04-06-2021, 09:55 PM   #4
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yeah surprised you would get more than 1x revolution. Remove chain and try spinning it. If you don't get at least 5-revs, check all those factors above.
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Old 04-07-2021, 06:53 AM   #5
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Quote:
Originally Posted by kuksul08 View Post
Each bike I've had is different.

Let's see what it could be:
1. Brake pads rubbing
2. Chain friction
3. Countershaft friction
4. Wheel bearings worn out
5. Wheel bearings seated too deeply or internal spacer collapsed causing too much preload on bearings.
6. Wheel bearing seals friction
7. Race wheels are too light
3. How does that make a difference if the gears are in N?
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Old 04-07-2021, 07:49 AM   #6
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Could be my torque wrench. I tightened the axle nut about 10 ft lbs less than spec. The wheel turns more freely. Ive been wanting to pick up a new high end wrench anyway
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Old 04-07-2021, 08:06 AM   #7
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3. How does that make a difference if the gears are in N?
the chain would still drive the countershaft to turn, so seals, oil drag etc will provide some friction
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Old 04-10-2021, 08:35 AM   #8
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SV's don't spin super freely, maybe a couple turns. Torque is low, 49 ft lb I think.
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Old 04-10-2021, 08:52 AM   #9
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Drag varies. Each bike is different.

Some things that effect how much the wheel will spin when turned by hand:

Bearing preload.
The bearings themselves.
The grease in the bearings.
The axle seals.
The brake pads.
How much the pads are drawn back when the pedal is released.
The degree of wear on both the rotor and the pads.
The chain or shaft mechanism.
The gears in the gearbox.
The lube in the gearbox.
And if the engine is running, any drag in the clutch when it's in neutral.

And that's only a partial list.
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Old 04-10-2021, 08:56 AM   #10
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Originally Posted by ST Guy View Post
Drag varies. Each bike is different.

Some things that effect how much the wheel will spin when turned by hand:

Bearing preload.
The bearings themselves.
The grease in the bearings.
The axle seals.
The brake pads.
How much the pads are drawn back when the pedal is released.
The degree of wear on both the rotor and the pads.
The chain or shaft mechanism.
The gears in the gearbox.
The lube in the gearbox.
And if the engine is running, any drag in the clutch when it's in neutral.

And that's only a partial list.
Yup, good list. When you turn that wheel, you're turning a bunch of gears as well. In cold oil.
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Old 04-10-2021, 04:19 PM   #11
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Yup, good list. When you turn that wheel, you're turning a bunch of gears as well. In cold oil.
Yep. Gears in the gearbox, lube in the gearbox.
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