Shaft Drive Locks Up When Stall - may be obvious to some, not to me

[oxforshirerider]

Hey all,

Appreciate I may open myself up for a bit of a flaming here, but just a heads up to the un-initiated (like me!).

My GSA WC is the first shaft-drive bike I have owned.

Yesterday on the motorway the traffic was busy and I was filtering, when a couple of cars decided they liked each other a little too much. I had to brake and manoeuvre in a bit of a hurry and in the process stalled, which in turn stops the shaft drive, which brings the rear wheel to an abrupt halt! Rear end fishtail, but all kept under control with a pull in of the clutch and a deep breath!

Loving the bike and so far 5000 miles in 8 weeks its been a good buy!

Happy riding all!

Rob

 

[flatdog]

torque. Good job you were going fast enough for a slide as they usually just fall over at low speed.

 

[Colban]

torque. Good job you were going fast enough for a slide as they usually just fall over at low speed.

Yes,but at least they don't fall very far.

 

[The Grey One]

Would not the same thing happen with a chain drive? Pulling in the clutch might have helped.

John

 

[telbenj]

Hey all,

Appreciate I may open myself up for a bit of a flaming here, but just a heads up to the un-initiated (like me!).

My GSA WC is the first shaft-drive bike I have owned.

Yesterday on the motorway the traffic was busy and I was filtering, when a couple of cars decided they liked each other a little too much. I had to brake and manoeuvre in a bit of a hurry and in the process stalled, which in turn stops the shaft drive, which brings the rear wheel to an abrupt halt! Rear end fishtail, but all kept under control with a pull in of the clutch and a deep breath!

Loving the bike and so far 5000 miles in 8 weeks its been a good buy!

Happy riding all!

Rob

Funny that it happens on a chain drive too,

Terry

 

[Keith Chapman]

Engine stops while you are in gear, then the whole drive train stops, bikes, cars, lorries etc are all the same unless you de-clutch.

 

[DrFarkoff]

I hate to say this but If you stalled the forward motion of the bike "should" have kept the engine turning over shaft or Chain or whatever???

UNLESS of course you had the rear brake firmly applied?

 

[GS_or_bust]

In a low gear it would be difficult for the wheel to turn the engine however I thought the slipper clutch was meant to stop the lockup in this situation.

 

[telbenj]

In a low gear it would be difficult for the wheel to turn the engine however I thought the slipper clutch was meant to stop the lockup in this situation.

No a slipper clutch only makes it less likely to skid when changing down the gears, if you think about it if it slipped all the time you wouldnt have any drive at all.

Terry

 

[Nice 'n' Fat]

I hate to say this but If you stalled the forward motion of the bike "should" have kept the engine turning over shaft or Chain or whatever???

You've got no chance ................. have you ever tried to bump start a GS?

 

[Sooty09]

Its something flat twins seem to do very easily especially if you have just come to twins from higher revving multis. My mate did exactly the same thing on a motorway, been driving for years and has no idea what went wrong but ended up on one cylinder head. I'v done it when I almost missed a junction, slammed the brakes on and stalled despite still moving forward at speed. I think the total energy of the bike (mass x velocity thing) is less than the energy of the rotating crank, whatever it happens.
Now expecting such comments as "pull your clutch in" etc etc. in the same way as you are told apply power in a tank slapper, or steer into a skid. Don't waste time on the key board folks, we are not idiots and yes we make mistakes at the daftest times.

 

[Schtum]

No a slipper clutch only makes it less likely to skid when changing down the gears, if you think about it if it slipped all the time you wouldnt have any drive at all.

Terry

It's an anti-hopping device - a reverse torque limiter. It only works in one direction and then only up to a point.

 

[Giles]

You've got no chance ................. have you ever tried to bump start a GS?

Absolutely. A 1200 twin is nigh on impossible to bump start - even on a gradient with a fair bit of speed you'll just skid the back wheel.

 

[flatdog]

Absolutely. A 1200 twin is nigh on impossible to bump start - even on a gradient with a fair bit of speed you'll just skid the back wheel.

easier if youre in a higher gear like 4th.

 

[Giles]

It's a (reasonably) regular thing at work. Radios, lights, satnavs what ever being left on at the side of the road and a bike going flat. They rarely start without jump leads ....

 

[DrFarkoff]

easier if youre in a higher gear like 4th.

Yup exactly 6th is like first when you look at it from the turning the engine over from the wheel end of the arrangement

Absolutely. A 1200 twin is nigh on impossible to bump start - even on a gradient with a fair bit of speed you'll just skid the back wheel.

It's a (reasonably) regular thing at work. Radios, lights, satnavs what ever being left on at the side of the road and a bike going flat. They rarely start without jump leads ....

Yes that's because the can bus system needs volts and amps to start stuff working If you had a duff starter but a half decent battery you could bump a 1200 No problem at all (unless of course you are a SSJ !!!!)

 

[Giles]

Ummmmmm .....

Ok, I'm no mechanic so I'll take yer word for it! next time I'll try it in fourth .....

 

[pistole]

pull clutch.