Rear Wheel spinning

[Bill_on_a_bike]

Started the bike today, bike was on its centre stand with the rear wheel off the ground. When I started the engine, in neutral, the rear wheel began to spin. So i stopped it spinning with the back brake, but it span again once i released the brake. So I put the bike in first with the clutch in, hit the back brake and the wheel didn't spin anymore.

Is this normal? Are there further tests I should do?

[jabcrosshook]

I've noticed on some videos on enduro bikes and supermotos idling on stands, don't know what it is though.

[slugworth1987]

thats what happened when my clutch died but its not your clutch could be just some drag

[techno]

Get it on the stand and go through the gears see how fast you can get to stood still lol

I saw 140 on the cbr!

I know it dont help but then again i dont know

[Bill_on_a_bike]

Yeah I suspected it could be my clutch dying which is why I tried it in gear and stuff.

All I can think, and someone tell me if this is stupid, but with almost no resistance, is it possible for the free spinning on the input shaft to have enough friction to cause this "drag" ?

[Guest]

more than likely as said clutch drag has it been sat for a while and cold start ( first start ? ) as the oil will be thick and causes the drag on the plates once its warmed up it will be fine and as you found out that a load against it soon warms the plates up so the oil warms up as well

[slugworth1987]

when you go into gear does it clunck and jerk if yes this is clutch drag if no the clutch cable might need adjusting and if still after that no joy i would say new clutch time

[Bill_on_a_bike]

Get it on the stand and go through the gears see how fast you can get to stood still lol

I saw 140 on the cbr!

I know it dont help but then again i dont know

 

Sadly my speedo drive is on the front wheel lol.

It doesn't really jerk when it's in gear and spinning, i think it does if i rev it up a bit.

I'll have a feel for clutch drag when i'm riding.

[Guest]

its bloody normal guys

nearly every bike out there will do it, rev it whilst still in neutral, what does it do?

[jabcrosshook]

its bloody normal guys

nearly every bike out there will do it, rev it whilst still in neutral, what does it do?

 

Go bang?

[Guest]

hopefully not lol

[slugworth1987]

makes more noise than when in gear?

remember that when you change your clutch, to also do the cable if u can.

[Guest]

who said his clutch is fried....Bill didnt you just do it???????

[slugworth1987]

im not sayin its fried just sayin if he does change it to change cable lol i know its normal on most bikes

[Guest]

i wouldnt change the cable on mine

[slugworth1987]

lol i did because it was deaded

[Bill_on_a_bike]

Clutch was replaced about 1000 miles ago. I've got no reason to think the clutch is dead. Bulli you might have seen me talking about wanting to do it myself next time.

[Guest]

mine hasnt got one

[slugworth1987]

clutch is easy once parts are in your hands member new gasket on your sump of it will leaky and dont use same oil lol remmeber new filter also and its all easy peasy just copy how it came off

[Bill_on_a_bike]

Yeah no i'd never put oil back in to an engine, it only needs 1ltr my ickle bike it's not worth it.

My concern is getting the spring bolts back on to correct torque (don't have a torque wrench might be worth investing).

Then my other worry is adjusting the push rod / cable back so that it disengages and engages properly.

[rollazuki]

think whats in the engine dude, crankshaft spinning pretty quick, turning the clutch assembly which in turn spins the input shaft in the gearbox.

Now that is covered in oil, so although its in neutral, there is still some drag, so its gears try to turn in speed with the shaft, so spinning the gears on the output shaft, thus spinning the sprocket, and therefore the rear wheel.

Its quite normal, bikes do it, a car ticking over on a lift will have the tyres rotating slowly, no problems at all Bill.

Rolla

[rennie]

It's perfectly normal!, nothing to worry about.

A slight clunk when you engage first is also normal and nothing to worry about

[dex]

As the guys said - stop thinking about changing clutches and don't worry

Bike is fine - they all do it. You'll notice once the bike warms up, oil thins, wheel slows down or stops turning.

It's the same theory that makes viscous coupling/ torque converters work.

[ade38]

i'll join in, it is normal like everyone said with oil not warmed up and the movement within the engine causes it to spin, plus i just did the clutch on my girl and the wheel spun. Nothin to worry about

[Bill_on_a_bike]

Yeah don't worry mate it's normal

Sorry, felt left out.

Thanks for reassurance guys and Rolla that's exactly what i thought tbh. And yeah rennie there s always a slight jolt in to first aswell, glad that's ok too.

Cheers