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gear indexing

 
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PostPosted: Sun Oct 24, 2004 8:49 am    Post subject: gear indexing Reply with quote

I have just rebuilt my 71 750 roadster gear box. The layshaft bearing was wrecked and the kickstart shaft was cracked. I replaced all the ball bearings, sleeve gear bushes, the kickstart shaft, pawl, spring, and bush, and the kick start spring. The shafts, gears, forks, and cam looked fine and measured good.

I indexed the cam carefully. Put together dry, it shifted through the gears.

Now, all put together, it goes easily and silently into first, neutral, and then will not go into second.

On the road, it can be coaxed into second or third with careful shifting without the clutch and at fairly high engine speed.

Down shifting doesn't really work well either.

Does anyone have any idea what I have done wrong? What should the next step be?

Many thanks!

Mike Provence
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nortonfan



Joined: 24 Dec 2003
Posts: 362
Location: Brisbane, Australia

PostPosted: Sun Oct 24, 2004 10:24 am    Post subject: Reply with quote

As even a "spanner" man like me can pull a norton gearbox apart & make it work. My guess is you only need to pull the covers off & see what you have not put back quite right.

No doubt you would have a manual that tells you what to do. If you check again & still can't work it out, one of the more technical blokes will surely have ideas to throw at you.

Maybe just pull the cases off & do it over to make sure you haven't missed something. Maybe that cam adjustment is a tooth out ?
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mike provence



Joined: 24 Oct 2004
Posts: 10
Location: san diego, ca

PostPosted: Sun Oct 24, 2004 7:51 pm    Post subject: Reply with quote

Thanks for the reply. The quadrant may be slightly in the wrong position. Would that cause these symptoms? Can I advance it a tooth or two without dismantling the entire box?
MP
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fastback



Joined: 18 Jul 2004
Posts: 245
Location: Toronto, Canada

PostPosted: Fri Oct 29, 2004 6:52 am    Post subject: Reply with quote

On my gearbox rebuild I initially installed the quadrant one tooth off.

It seemed to shift fine until I installed the inner cover and I couldn't shift into first. It also created all sorts of strange shifting behavior.

The quadrant arm was hitting the bottom of the of the inner cover slot. The instruction to have the quadrant arm "line up" with the case stud was a bit of a red herring - on my box the arm locates either a little above or below depending on the tooth- my first guess was slightly below the stud~ bad guess.

Alas, there was nothing to do but pull it all apart.

Good luck.

Phil
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.