Gearbox noise

[Den]

Could someone try this and reassure me that all is hunky dory.
Put the bike (1150gs) on centrestand, start it up and run it through the gears. Make sure the front wheel is firmly on the ground. Two or three thousand revs. Whats the gearbox noise like. ?
I am fully aware that with no load on the box, it will be noisy. But the noise from mine is mechanically painfull. So bad that I checked to see if there was oil still in it.
I am not particularly worried by it as its a good (for a bwm) box, changes well and is not noisy during normal use, but, bloody hell, what a racket.

If you do try this .... make sure the back wheel is clear of anything.... especially THE GROUND.
Den

 

[Paul Young]

Den,

DO NOT DO THIS TO YOUR GS!!!!!

You are running the output from the gearbox through an angle which the driveshaft is not designed to. The noise is the universal joints at each end of the shaft binding against themselves due to the extreme angle.

Scared the sh*t out of me first time I heard it too.....

HTH,

 

[(RIP) maverick]

Yep I have done this before and sounds like the thing is going to fall apart. Rather not run the wheel on the centre stand.

 

[Ian Whinnett]

No reassurance here

I suppose the fact that the box is not about to self destruct is some consolation.

The drive shaft is oddly driven through two universal joints which have a very low efficient operating angle. Check the one in your socket set. If the angle is increased the working capacity then the joints very quickly accelerate and decelerate as they rotate. At the same time they are trying to send each other in the opposite direction and lock up at the same time.

The fact that the shafts run universal joints (UJs) means that they are prone to wearing out much more quickly than their Constant Velocity Joint equivalent's (CV).

Be very carefull I have just replaced my shaft and the shaft is about £250 without labour.

 

[(RIP) Kaister]

That's why 'guzzi put a double universal joint ( cardan joint ) at the gearbox end and a sliding spline at the wheel end.

Hasn't the 'new' 1200 got this ?