Where does the noise come from?

cliffa said:
Thanks Tony, I'll look into it.

Regarding a replacement clutch basket, i'm unclear of the position Norton are taking on spares for the SG bikes. I quote from the email they sent out some time ago..

"Our Parts Department will shortly open, and when this happens, we will sell parts that are fitted to our own Norton Commando Classic 961 only. For the reasons set out above we will not be able to guarantee that they will fit your bike, nor that they are suitable or fit for purpose on your motorcycle. "

So are they saying they will refuse to sell spares unless you can prove you have one of their bikes? Or do they mean they will sell me a clutch basket, but if it doesn't fit or later fails and causes me to have an accident they will accept no liability?

They also informed me that the 'new' Commando will not be available outside the U.K. until they have got their operations running properly there :(
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They have been pretty clear (eventually) that they will sell us parts, but only those for the ‘new’ 961 - whatever that ends up looking like. Our difficulty will be in identifying which parts have been modified/re-engineered. Hopefully they will be forthcoming with that information when the parts start flowing. You’d have to think that the overwhelming majority of components would be the same pattern.
 
@Stephen_Spencer its less "eventually" and more "actually":

Where does the noise come from?
 
cliffa said:
I wish my 2011 sounded like the one in the film. I have put in a new complete backlash gear, new bearings in the clutch basket (including a double row one on the inner), drilled out the rivets (which had been welded up before) and replaced with HT bolts and pinned the ring gear. I did find some wear on the centre of the basket and found rotating it 180° from its original position got rid of the play I could feel between the basket and the drive gear plate. (Obviously it will return eventually). That did quieten down some of the rattle at idle that I heard with the clutch out. I had also put in Bel-Ray Sport transmission oil, but the clutch and gear changes didn't seem to like it, so I drained it out. I was alarmed at the amount of silver content in the oil after only a few hundred miles, so I pulled the primary again to see what was going on or if I had screwed up something on reassembly. The original idler gear was replaced as it showed wear on one side of the flange on which the scissor gear rotates (which must be a miniscule amount). During the subsequent inspection of the new one I found witness marks in exactly the same area so there is definitely some big force acting on it. I could not find anything untoward so cleaned it all up with brake cleaner. The amount of metal content that came out from the joint between the ring gear and the backplate was unbelievable. It must act as a centrifuge. I presume the metal content is the new idler gear running in and the stuff behind the ring gear has just accumulated over time. While I had it apart, I drilled out the centre of the drain plug and JB welded a strong magnet to it. After what I had found, I would strongly recommend doing the same or buying one. (Maybe the later bikes already have one fitted?)

I also changed the timing chain and tensioners from the early metal version to the nylon type hoping that would help on the noise front, but it still sounds bloody awful TBH.

On initial start-up it's acceptably quiet but the noise gets progressively worse as it warms. Also Under load it also sounds like a jackhammer, is that normal, or should I be looking somewhere else?

I would really like to get to the bottom of it, as I love the bike, but the noise really gets me down.

On the Facebook 961 page somebody asked what you would call a group of 961's - I suggested "A Clatter" :rolleyes:
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cliffa said:
Perhaps I could fill the primary with grease :D
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Or that gear climbing oil additive .
 
Fast Eddie said:
Why did they make the primary so complex, why not just use a good, strong, chain?

Anyone know ?
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Presumably only Kenny Dreer could answer that I guess. I did ponder on a chain conversion, but to keep the balance shaft and oil pump rotating in the correct direction the chain would need to pass over the top of the balance shaft, and that would probably introduce more issues.
 
cliffa said:
Presumably only Kenny Dreer could answer that I guess. I did ponder on a chain conversion, but to keep the balance shaft and oil pump rotating in the correct direction the chain would need to pass over the top of the balance shaft, and that would probably introduce more issues.
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There are other bikes that use gear drive primaries without noise issues . Don't Indian Thunder Stroke and Hinckley Twins use gear primaries ? The difference may be the way those are driving the balance shafts , not going through the power flow path. Norton 961 may be unique in this way.
 
Interesting to see they've provided the material info for the cush rubbers though....so they're not using Talon, but appear to have had the material of their copies altered instead. Saves me a job of working it out at least haha
 
Stu Bodycote said:
Interesting to see they've provided the material info for the cush rubbers though....so they're not using Talon, but appear to have had the material of their copies altered instead. Saves me a job of working it out at least haha
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Lets hope that they did alter them Hey ? Not the same too soft cush drive rubbers of the old regime ?
 
Reading between the lines of that image, they have done. I'll just keep supplying the Talon originals though tbh.
 
They supply when they have stock. When they run out, they wont produce more until the MOQ is met...which was a while last time. They were good in that they did phone me as soon as they had them back on the shelf though. I bought 10 sets and five rear sprockets at the time. They'll only give me a trade discount if I have a trade account with them....they'll only give me trade account if I spend £10k a year with them. I'll be looking to have the cush rubbers made elsewhere eventually. I had the dimensions, and now TVS has very kindly supplied me with the material spec too.
 
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richard-7 said:
As BritTwit said. Balance shaft gear is main culprit. It can be fixed tho. We have a tension setting tool to make it easier and perfect. But be careful its very easy to over tension which is mostly the case in pre 2015 models. The assembly team have gotten better thats for sure. Also straight cut gears and timing chain could be a little loose.
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Richard,
I saw on your One-7 page that you had Carbon parts for the Dominator, do you still have any?
Cheers
 
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