First gear jumps out in neutral

pierodn

Joined
Nov 10, 2012
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Hello to All.
An old story this.
I usually solve the problem changing the first gear layshaft bush.
Do you have other suggests?.
Thank you.
Piero
 
pierodn said:
Hello to All.
An old story this.
I usually solve the problem changing the first gear layshaft bush.
Do you have other suggests?.
Thank you.
Piero
Click to expand...
Not sure exactly what you mean?
Is the bike jumping out of first gear?
When my Norton was doing that it turned out to be the hairpin spring and the bike wasn't actually engaging first gear fully
 
baz said:
Not sure exactly what you mean?
Is the bike jumping out of first gear?
When my Norton was doing that it turned out to be the hairpin spring and the bike wasn't actually engaging first gear fully
Click to expand...
Sorry bbut title is

"First gear jumps out in neutral".​

It means that the bike jumping out of first gear!
 
Torontonian said:
New tight layshaft bush , also shim the layshaft at the kicker , using rear isolastic shims . Old britts tells you how to do it properly .
Click to expand...
All my norton gearbox dont have shim at the kicker and all work good.
Only one jumps.
I dont believe in shim.
 
pierodn said:
All my norton gearbox dont have shim at the kicker and all work good.
Only one jumps.
I dont believe in shim.
Click to expand...
Do you have a roller bearing on the layshaft?
If you do then you really need to shim
If you have a ball race there is no need
 
baz said:
Do you have a roller bearing on the layshaft?
If you do then you really need to shim
If you have a ball race there is no need
Click to expand...
Yes , I always use Roller bearing to Layshaft end of internal box . But that can create a bit of drifting . Or not . Layshaft 1 st . gear needs a good tight bush . It's delicate . Heat and cold are your friends .
 
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If you leave the bike in gear at trafficstops as opposed tofinding neutral ,it will not jump out
 
pierodn said:
All my norton gearbox dont have shim at the kicker and all work good.
Only one jumps.
I dont believe in shim.
Click to expand...

It could be this particular gearbox does require shimming.
Have you measured the end-float? This can be done without removing the kickstart lever or outer gearbox cover.

Even if it has a layshaft ball bearing it might need to be shimmed.

Layshaft: Balls or rollers

In the recent post about layshaft re-bearing, the question of using the roller bearing or a ball bearing replacement came up. Apparently the Commando guru says balls, others say rollers. What is the pro/con for a street bike rebuild or is it just a "fielders choice" ?
www.accessnorton.com www.accessnorton.com

comnoz said:
Shimming the gearbox to prevent first gear problems has been a normal shop practice since the AMC box came to be used on large motors. Long before anyone ever thought of installing a roller bearing on the layshaft. This information was courtesy of Brian Slark many years ago. And yes .010 or .020 means a lot. I have certainly cured many gearboxes that popped out of first with nothing but a few shims. Jim
Click to expand...

Shimming the kicker shaft

www.accessnorton.com www.accessnorton.com
 
L.A.B. said:
It could be this particular gearbox does require shimming.
Have you measured the end-float? This can be done without removing the kickstart lever or outer gearbox cover.

Even if it has a layshaft ball bearing it might need to be shimmed.

Layshaft: Balls or rollers

In the recent post about layshaft re-bearing, the question of using the roller bearing or a ball bearing replacement came up. Apparently the Commando guru says balls, others say rollers. What is the pro/con for a street bike rebuild or is it just a "fielders choice" ?
www.accessnorton.com www.accessnorton.com



Shimming the kicker shaft

www.accessnorton.com www.accessnorton.com
Click to expand...
Hello Les.
I will try as you sugest.
Thank you.
Piero
 
oldmikew said:
If you leave the bike in gear at trafficstops as opposed tofinding neutral ,it will not jump out
Click to expand...
This will cook the clutch. It's a bad idea on any vehicle.

As said above shimming will normally fix the problem unless the dogs on the first gear are damaged and worn. These can sometimes be rescued with careful dressing with a dremel. But try shimming first.
 
johnm said:
This will cook the clutch. It's a bad idea on any vehicle.

As said above shimming will normally fix the problem unless the dogs on the first gear are damaged and worn. These can sometimes be rescued with careful dressing with a dremel. But try shimming first.
Click to expand...
I agree it's a bad Idea to sit with a bike in gear holding the clutch in
But that's exactly what new riders are being instructed to do
And have been for the last 3 years or so
 
baz said:
I agree it's a bad Idea to sit with a bike in gear holding the clutch in
But that's exactly what new riders are being instructed to do
And have been for the last 3 years or so
Click to expand...
Goodness. Why on earth would they teach that?

A very long time since I passed my licence. Both in NZ and the UK but that is certainly not what I was taught. And you can determine it for yourself. Holding the clutch in while sitting at the lights will slowly heat up most bike clutches.
 
johnm said:
Goodness. Why on earth would they teach that?

A very long time since I passed my licence. Both in NZ and the UK but that is certainly not what I was taught. And you can determine it for yourself. Holding the clutch in while sitting at the lights will slowly heat up most bike clutches.
Click to expand...
They carried out a study of traffic light accidents where cars rear ended stationary bikes I believe
So it's now recommended to be back from the car in front of you
In first gear
Keeping an eye on your mirror for any car coming too fast behind you
So you can manoeuvre out of the way
Someone will correct me if I have this wrong
 

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