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Front Forks Rebuild

 
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tony Targett



Joined: 18 Jul 2003
Posts: 25
Location: Sydney Australia

PostPosted: Sun Mar 28, 2004 10:57 pm    Post subject: Front Forks Rebuild Reply with quote

The front forks on my 850 MkIIa seem to bottom out with a nasty 'clang' over any decent pothole. They don't seem very compliant but I don't have anything to compare them with.

Before I start anything I have some questions for the forum:

1. What is the best source of information on disassembly & assembly? I like pictures!!
2. What mods are are used to improve the roadholders?
3. What fork oil & capacity are commonly used? I hear that complete disassembly is the only way to completely drain the old fork oil.
4. What questions should I be asking?
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Ron L



Joined: 27 Feb 2004
Posts: 1101
Location: Ohio

PostPosted: Mon Mar 29, 2004 5:16 am    Post subject: Reply with quote

Tony,
Get a factory service manual and a parts manual. Both have pretty nice pictures and detailed description of how the forks work.
Popular mods are progressive springs and the "Covenant" damper modification. I haven't done either, but I have had the same nasty "clang" on my cafe racer and plan to someday try both.
Ron L
'73 Roadster 750
'73 Interstate 850
'75 Production Racer replica 850
'68 Fastback 750
'69 P11A Ranger
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Jerry Doe
Site Admin


Joined: 21 May 2003
Posts: 172
Location: Irvine, California

PostPosted: Mon Mar 29, 2004 10:41 am    Post subject: Forks Reply with quote

I rebuild my front end every year. It's pretty straight forward, and a manual will help.

Fork oil should be 20 or 30 weight- I use 20.

After this years rebuild the front end was clanking over bumps as you describe. I removed the oil and noticed I put twice as much (300cc) in each leg (too much homebrew Embarassed ).

The interesting thing is that I had read an article previously, which suggested too much oil will create bottoming out, but I did not believe it.

The fact is too much oil in the fork legs will make them clank. Once I put the right amount in each leg (150cc) everything was perfect!

Jerry
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norbsa48503



Joined: 07 Apr 2004
Posts: 995
Location: Flint, Michigan

PostPosted: Wed Apr 07, 2004 11:28 am    Post subject: Reply with quote

I got the Alum. damptner tubes from British Spares NZ. They already have the holes moved up the one half inch. Be carful if you use these they need a 8mm fine thread screw to hold them in the bottom of the sliders. This change prevents toping out not bottoming out. To solve bottoming use progressive springs and add washers to shimm these springs until you get the right amount of drop when you sit on the bike. Leak proof seals a "brand name" seem to last a long time. I run gators not scrappers. I like this set up have it on both Commandos. norbsa
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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.