Norton trouble sound

Hi all,

Just started having this sound on my 73 Commando 750.

In 3rd gear, upon accelration, there is a highpitched whine, increasing with
revs. If the rev level out (steady throttle), I hear a pulsating grinding
sound (like a disc rubbing which is not true). With decreasing throttle, the
sound stops.

Only happens in third gear. In second gear I can hear a bit of the
aforementioned whine, but no grinding 'shu-shu-shu-shu'.

I suspect a clutch problem. Any help here?
Thanks in advance.

-David Garvin
dgarvin AT ti dot com

 

I suspect the end journal on one of the shafts in the gear-box.
--
Tim two#21, YGL#3 & BOTAFOT#84

Due to the limitations of current email, the lip movements may be
out of synchronisation as you move your finger under the text while reading.

tim dot ukrm2 at dsl dot pipex dot com

 

The gearbox layshaft bearing often fails unless it has been upgraded to a
roller bearing. If it collapses totally it could lock the gearbox. Don't
ride it until you find out for sure what it is. You can dismantle the
gearbox in situ if needs be. Another indication of the bearing failing is
that sometimes the kickstart moves down on it's own as you ride along.


Iggy

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, Iggy

That could be really nasty at 140...

<walks away, whistling innocently>
--
Nigel - Manufacturer of the "Champion-105" range of rearsets

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
ZZR1100, Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"

 

Indeed. You'd be, well, screwed...

Shall we go together?

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, platypus

What key?
--
Nigel - Manufacturer of the "Champion-105" range of rearsets

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
ZZR1100, Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"

 

I gorra Bic here - will that do?

 

Pip says...

#I gorra bic, you can ride it if you lic

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, Pip

Not on a nold Britter mate. You're going to need a Parker. With a
left-hand thread.
--
Nigel - Manufacturer of the "Champion-105" range of rearsets

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
ZZR1100, Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"

 

Ahem.

"The Parker Pen Company, Janesville, Wisconsin, USA."

--
| ___ Salad Dodger
|/ \
_/_____\_ GL1500SEV/CBR1100XXX/KH500A8/TS250C
|_\_____/_| ..73063../..16589.../..3180./.19406
(>|_|_|<) TPPFATUICG#7 DIAABTCOD#9 YTC#4 PM#5
|__|_|__| BOTAFOT #70 BOTAFOF #09 two#11 WG*
\ |^| / IbW#0 & KotIbW# BotTOS#6 GP#4
\|^|/ ANORAK#17 IbB#4
'^'

 

'S OK. It'll be Imperial.

Or should it be a 4BA pen for a nold Britter of that vintage?

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, Pip

On reflection, more like a 2BA, IWHT. With a 7/17" head. And four
washers.
--
Nigel - Manufacturer of the "Champion-105" range of rearsets

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
ZZR1100, Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"

 

I don't think I CBA.

 

Thanks for the advice.
The gearbox is waiting for service on Thursday.

-David
Sugar Land, Texas
The gearbox layshaft bearing often fails unless it has been upgraded to a
roller bearing. If it collapses totally it could lock the gearbox. Don't
ride it until you find out for sure what it is. You can dismantle the
gearbox in situ if needs be. Another indication of the bearing failing is
that sometimes the kickstart moves down on it's own as you ride along.
The gearbox layshaft bearing often fails unless it has been upgraded to a

 

Thanks for the advice.
The gearbox is waiting for service on Thursday.

-David
Sugar Land, Texas
The gearbox layshaft bearing often fails unless it has been upgraded to a
roller bearing. If it collapses totally it could lock the gearbox. Don't
ride it until you find out for sure what it is. You can dismantle the
gearbox in situ if needs be. Another indication of the bearing failing is
that sometimes the kickstart moves down on it's own as you ride along.
The gearbox layshaft bearing often fails unless it has been upgraded to a