850 Rear Chain Guard Extension

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phil yates

phil yates

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Mar 24, 2014
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A trivial reason to start a topic.
For some reason, my MkIII arrived from the USA with no rear chain guard extension. I wasn't going to worry about it but my brother said no self respecting MkIII owner could live without one. So I bought one on line for an outrageous price, for what it is. It came with S/S buttons. Dressed in my grey dust coat and tie, I headed to the carport to fit it. Easy enough to see how it went together, but just how do you do it? It looked to me like first the chain guard needs to be removed, a major operation in my view. No, I simply didn't have time that afternoon.

But how do you get the spring and buttons all in place in what is a skinny little slot that fingers can't easily reach into? Got me beat. I don't care if someone tells me I'm stupid (which I am) but if there is a trick to it please tell.

Speaking of chains, mine seems to maintain adjustment very well. My 72 Combat needed adjustment nearly every other day. But I used to accelerate that machine so hard it is not surprising. I don't know if the MkIII was fitted with a heavier chain but I haven't needed to adjust it since the bikes arrival in early February.

Anyway, any tips on fitting the extension would be appreciated.
 
There are all sorts of chain about some good a lot bad, the cush drive on the MK3 is better than the earlier version plus the combat engine is a hooligans bike ;) All add up to big differences in chain life.
 
phil yates said:
A trivial reason to start a topic.
For some reason, my MkIII arrived from the USA with no rear chain guard extension. I wasn't going to worry about it but my brother said no self respecting MkIII owner could live without one. So I bought one on line for an outrageous price, for what it is. It came with S/S buttons. Dressed in my grey dust coat and tie, I headed to the carport to fit it. Easy enough to see how it went together, but just how do you do it? It looked to me like first the chain guard needs to be removed, a major operation in my view. No, I simply didn't have time that afternoon.

But how do you get the spring and buttons all in place in what is a skinny little slot that fingers can't easily reach into? Got me beat. I don't care if someone tells me I'm stupid (which I am) but if there is a trick to it please tell.

Speaking of chains, mine seems to maintain adjustment very well. My 72 Combat needed adjustment nearly every other day. But I used to accelerate that machine so hard it is not surprising. I don't know if the MkIII was fitted with a heavier chain but I haven't needed to adjust it since the bikes arrival in early February.

Anyway, any tips on fitting the extension would be appreciated.
Click to expand...


:lol: :lol: :lol: :lol: ...... I cant resist this....... :lol: :lol: :lol: :lol:..... OK i agree with you.. "Your Stupid"...... :lol: :lol: :lol: :lol: :lol: :lol:

.
 
olChris said:
phil yates said:
A trivial reason to start a topic.
For some reason, my MkIII arrived from the USA with no rear chain guard extension. I wasn't going to worry about it but my brother said no self respecting MkIII owner could live without one. So I bought one on line for an outrageous price, for what it is. It came with S/S buttons. Dressed in my grey dust coat and tie, I headed to the carport to fit it. Easy enough to see how it went together, but just how do you do it? It looked to me like first the chain guard needs to be removed, a major operation in my view. No, I simply didn't have time that afternoon.

But how do you get the spring and buttons all in place in what is a skinny little slot that fingers can't easily reach into? Got me beat. I don't care if someone tells me I'm stupid (which I am) but if there is a trick to it please tell.

Speaking of chains, mine seems to maintain adjustment very well. My 72 Combat needed adjustment nearly every other day. But I used to accelerate that machine so hard it is not surprising. I don't know if the MkIII was fitted with a heavier chain but I haven't needed to adjust it since the bikes arrival in early February.

Anyway, any tips on fitting the extension would be appreciated.
Click to expand...


:lol: :lol: :lol: :lol: ...... I cant resist this....... :lol: :lol: :lol: :lol:..... OK i agree with you.. "Your Stupid"...... :lol: :lol: :lol: :lol: :lol: :lol:

.
Click to expand...

Thanks Chris
Your information is always well thought out and very useful.
Ever since I suggested you let a great White eat you, seems you've had your nose out of joint.
You obviously didn't see the tongue in cheek aspect of the comment.
But I can live with that.

Sand groppers have always had a problem with easterners anyway.
I find it amusing. Maybe catch you for a beer sometime.
 
kommando said:
There are all sorts of chain about some good a lot bad, the cush drive on the MK3 is better than the earlier version plus the combat engine is a hooligans bike ;) All add up to big differences in chain life.
Click to expand...

I know this thanks.
Did the MkIII get fitted with a heavier chain?
Yes the combat was a rip roarer, until it exploded on me at 110mph, so to speak.
After the super blend mains were fitted, and a 21T sprocket, it was a tame good running machine.
But I missed the fierce acceleration with the 19T sprocket. Yes, I was a hooligan! I challenged anything and everything on the road. And always won, as I recall. Not my riding ability but the acceleration of the machine. The Kwaka 900 got away from me, after second gear. Not bad though for a 1947 engine!
 
MK3 used same chain so its not uprated so its down to what you already know and should have included in your post to save me the bother answering.
 
kommando said:
There are all sorts of chain about some good a lot bad, the cush drive on the MK3 is better than the earlier version plus the combat engine is a hooligans bike ;) All add up to big differences in chain life.
Click to expand...

Just a further comment. In those early days of the 70's, I rode like a total maniac. One night I had an argument with my girlfriend and took off riding all the way home through 35mph zones at close on 100mph. Over the top of the Avalon golf course, the Combat got the wobbles badly on the bumps, but I never backed off. Hobot would have been proud of me. My brother and one other tried to keep up. By the time they arrived in the driveway at home, I was upstairs having a cup of tea.

Very stupid days but I survived. Now ride like a complete pussy cat.
 
phil yates said:
A trivial reason to start a topic.
For some reason, my MkIII arrived from the USA with no rear chain guard extension. I wasn't going to worry about it but my brother said no self respecting MkIII owner could live without one. So I bought one on line for an outrageous price, for what it is. It came with S/S buttons. Dressed in my grey dust coat and tie, I headed to the carport to fit it. Easy enough to see how it went together, but just how do you do it? It looked to me like first the chain guard needs to be removed, a major operation in my view. No, I simply didn't have time that afternoon.

But how do you get the spring and buttons all in place in what is a skinny little slot that fingers can't easily reach into? Got me beat. I don't care if someone tells me I'm stupid (which I am) but if there is a trick to it please tell.

Speaking of chains, mine seems to maintain adjustment very well. My 72 Combat needed adjustment nearly every other day. But I used to accelerate that machine so hard it is not surprising. I don't know if the MkIII was fitted with a heavier chain but I haven't needed to adjust it since the bikes arrival in early February.

Anyway, any tips on fitting the extension would be appreciated.
Click to expand...

Think tent pole phil. You can do it. :idea:
 
One way is to assemble the spring and buttons into the extension piece so the buttons are sticking out of the holes. Then partially slide the ext. into the chainguard channel slightly depressing the buttons as you go and then slide into position. This assumes the thing is made of the right shape and holes drilled in the right place etc etc...
 
kommando said:
MK3 used same chain so its not uprated so its down to what you already know and should have included in your post to save me the bother answering.
Click to expand...

What should have I included in my post?
Sorry to bother you having to answer, you should not have strained yourself.
Thanks though re chain size. I thought not with same sprockets.
But what I want to particularly know is any trick to fitting the guard extension.
But don't strain yourself again. I struggle to understand Scottish accents anyway :)
 
concours said:
phil yates said:
A trivial reason to start a topic.
For some reason, my MkIII arrived from the USA with no rear chain guard extension. I wasn't going to worry about it but my brother said no self respecting MkIII owner could live without one. So I bought one on line for an outrageous price, for what it is. It came with S/S buttons. Dressed in my grey dust coat and tie, I headed to the carport to fit it. Easy enough to see how it went together, but just how do you do it? It looked to me like first the chain guard needs to be removed, a major operation in my view. No, I simply didn't have time that afternoon.

But how do you get the spring and buttons all in place in what is a skinny little slot that fingers can't easily reach into? Got me beat. I don't care if someone tells me I'm stupid (which I am) but if there is a trick to it please tell.

Speaking of chains, mine seems to maintain adjustment very well. My 72 Combat needed adjustment nearly every other day. But I used to accelerate that machine so hard it is not surprising. I don't know if the MkIII was fitted with a heavier chain but I haven't needed to adjust it since the bikes arrival in early February.

Anyway, any tips on fitting the extension would be appreciated.
Click to expand...

Think tent pole phil. You can do it. :idea:
Click to expand...

I never put a tent up in a 1" crack. But I will keep thinking tent poles.
 
Al-otment said:
One way is to assemble the spring and buttons into the extension piece so the buttons are sticking out of the holes. Then partially slide the ext. into the chainguard channel slightly depressing the buttons as you go and then slide into position. This assumes the thing is made of the right shape and holes drilled in the right place etc etc...
Click to expand...

Thanks Al
Unit is the right shape. Holes presumably must be in correct position, they have not been drilled by someone else I don't believe. They are a fair way in but I think this is normal. I had one once before but never looked at or touched the sucker. It is so embarrassing without one. Everyone in the street laughs at me. :)
 
You could have a sealed chain of some sort on there. Adjust maybe once or twice in 20,000 miles then replace.

Glen
 
worntorn said:
You could have a sealed chain of some sort on there. Adjust maybe once or twice in 20,000 miles then replace.

Glen
Click to expand...

I never have had a sealed chain, so know little about them.
20,000 miles between adjustments sounds good to me.

I must say, I have never been happy with prescribed correct tension. How does one measure say 3/4" free play? How hard do you push the chain up and down to measure this in mid air? Should really be done when sitting on bike so needs be done by feel. Then there are tight spots to worry about. I worry about everything and chain tension is one of them. I used to hate adjusting tappets too. And points, but I threw them in the river.

And getting your hands dirty?
I have a clean Norton rider image to maintain. Geoff Duke never wandered around with greasy hands!
 
I like sealed chains, as do most longer distance riders. Before fitting a sealed chain on my touring bike, one season of riding was the life of a chain. And there was the constant need to adjust when on the road doing 350-400 miles per day. Sprockets are lasting longer as well. That is because they are not getting pulverized by halfway sacked out conventional chain that when worn has a different pitch than the sprockets do/did.

Now that xring chains are available the old complaint about power loss with sealed chains is no longer valid, if it ever was. Use a spray chain wax on it now and then. No more globs of grease stuck to the rear rim that way.
All very clean, like Geoff Duke.

Glen
 
worntorn said:
I like sealed chains, as do most longer distance riders. Before fitting a sealed chain on my touring bike, one season of riding was the life of a chain. And there was the constant need to adjust when on the road doing 350-400 miles per day. Sprockets are lasting longer as well. That is because they are not getting pulverized by halfway sacked out conventional chain that when worn has a different pitch than the sprockets do/did.

Now that xring chains are available the old complaint about power loss with sealed chains is no longer valid, if it ever was. Use a spray chain wax on it now and then. No more globs of grease stuck to the rear rim that way.
All very clean, like Geoff Duke.

Glen
Click to expand...

Thanks Glen
How do you identify a sealed chain?
Maybe I will fit a sealed chain guard and pretend there is no chain in there at all. Out of sight, out of mind. :)
I do use spray chain wax. Many years ago we used molidinum disulphide. Took the whole chain off, heated the large round tin of black MD and dropped coiled chain into it when molten. What a dirty filthy job that was, not to mention then dealing with the chain in refitting.

Geoff told me he never knew anything about chains, not even oil for the engine. He knew where the throttle, brake and gear change was. He even knew where that was on the MkIII. I phoned him to say the gear change was very spongy in feel.
He said try the other side idiot!!
 

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phil yates said:
olChris said:
phil yates said:
A trivial reason to start a topic.
For some reason, my MkIII arrived from the USA with no rear chain guard extension. I wasn't going to worry about it but my brother said no self respecting MkIII owner could live without one. So I bought one on line for an outrageous price, for what it is. It came with S/S buttons. Dressed in my grey dust coat and tie, I headed to the carport to fit it. Easy enough to see how it went together, but just how do you do it? It looked to me like first the chain guard needs to be removed, a major operation in my view. No, I simply didn't have time that afternoon.

But how do you get the spring and buttons all in place in what is a skinny little slot that fingers can't easily reach into? Got me beat. I don't care if someone tells me I'm stupid (which I am) but if there is a trick to it please tell.

Speaking of chains, mine seems to maintain adjustment very well. My 72 Combat needed adjustment nearly every other day. But I used to accelerate that machine so hard it is not surprising. I don't know if the MkIII was fitted with a heavier chain but I haven't needed to adjust it since the bikes arrival in early February.

Anyway, any tips on fitting the extension would be appreciated.
Click to expand...


:lol: :lol: :lol: :lol: ...... I cant resist this....... :lol: :lol: :lol: :lol:..... OK i agree with you.. "Your Stupid"...... :lol: :lol: :lol: :lol: :lol: :lol:

.
Click to expand...


Sand groppers have always had a problem with easterners anyway.
I find it amusing. Maybe catch you for a beer sometime.
Click to expand...

Chris
I expect you will say no for a beer, but should you change your mind, I won't drink that standard WA shit. Little Creature? Yes. Even though they are now owned by Lyon Nathan.
Ferral also make a great WA beer. I used to supply them with their malt when I owned and ran Maltcraft, a supply business I started and ran by myself. But down your way, not sure where your nearest micro brewery would be anymore.

You could get me drunk and throw me to the Great Whites, as pay back. :)
 
Ferral also make a great WA beer. I used to supply them with their malt when I owned and ran Maltcraft, a supply business I started and ran by myself. But down your way, not sure where your nearest micro brewery would be anymore.

You could get me drunk and throw me to the Great Whites, as pay back. :)[/quote]

Carrying sacks of malt on my then Norton was very difficult, especially to WA. The business was looking strong when I was offered a job back in flying, for Rupert Murdoch as Captain of his GIV corporate jet in Sydney, so I sold Maltcraft and went back flying, met a lot of interesting folk. Russel Crowe flew in from LA one day. He came up and introduced himself to me. I asked him if he was one of the mechanics at the base. Then the aircraft was suddenly sold and I was back on the street again, with nothing.

Of all the things that have come and gone in my life, wives, children, flying jobs, simulator management jobs, businesses, farms, houses, money etc. The only thing I have ever kept is my past and present Nortons. Starting at 16yrs old with a Dominator up to now with a MkIII. Maltcraft went on to become a huge business for the new owner with flourishing micro breweries and export supplies for the new owner.

But I am happy just that I still have a Commando. I even gained and lost a beautiful girlfriend because of my Nortons, another story. I loved her to death but shit happens. My whole life has revolved around Nortons and probably always will.
 
phil yates said:
Al-otment said:
One way is to assemble the spring and buttons into the extension piece so the buttons are sticking out of the holes. Then partially slide the ext. into the chainguard channel slightly depressing the buttons as you go and then slide into position. This assumes the thing is made of the right shape and holes drilled in the right place etc etc...
Click to expand...

Thanks Al
Unit is the right shape. Holes presumably must be in correct position, they have not been drilled by someone else I don't believe. They are a fair way in but I think this is normal. I had one once before but never looked at or touched the sucker. It is so embarrassing without one. Everyone in the street laughs at me. :)
Click to expand...

Are you sure that's because of the lack of chain guard extension?
 
Al-otment said:
phil yates said:
Al-otment said:
One way is to assemble the spring and buttons into the extension piece so the buttons are sticking out of the holes. Then partially slide the ext. into the chainguard channel slightly depressing the buttons as you go and then slide into position. This assumes the thing is made of the right shape and holes drilled in the right place etc etc...
Click to expand...

Thanks Al
Unit is the right shape. Holes presumably must be in correct position, they have not been drilled by someone else I don't believe. They are a fair way in but I think this is normal. I had one once before but never looked at or touched the sucker. It is so embarrassing without one. Everyone in the street laughs at me. :)
Click to expand...

Are you sure that's because of the lack of chain guard extension?
Click to expand...
 
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