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#69306 - 04/07/07 1:00 pm Norton isolastics  
Joined: Jul 2004
Posts: 2
JSR67B44R Offline
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JSR67B44R  Offline
BritBike Forum

Joined: Jul 2004
Posts: 2
Downingtown, PA
I'm restoring a '71 Norton with 7600 miles. Shall I assume that the isolastics should be replaced due to age ? I disassembled the head steady and the rubbers look/feel OK.

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#69307 - 04/07/07 1:23 pm Re: Norton isolastics  
Joined: Jul 2005
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John RGS Offline
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John RGS  Offline
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Joined: Jul 2005
Posts: 1,919
new jersey usa
When folks go running from the building at the mention of Norton isolastics it isn't usually related to the head steadies as these are the easiest to replace. A good manual will give you the proper play and methods to check the lower iso's and the replacement procedure if needed. It really isn't too difficult.


,_o
_ -\_<,
(*)/'(*)

NOPGS #2
#69308 - 04/07/07 3:15 pm Re: Norton isolastics  
Joined: Dec 2004
Posts: 8,889
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,889
Scotland
Unless obviously bad keep em, the later types have harder rubber and change the point the vibration smooths out up the rev range, the lower the better.

#69309 - 04/07/07 7:00 pm Re: Norton isolastics  
Joined: Oct 2005
Posts: 164
78AMIgrad Offline
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78AMIgrad  Offline
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Joined: Oct 2005
Posts: 164
Juneau, AK
Replace them. You will probably be horrified at their condition and be glad you did. If they look good and the frame tubes are'nt rusted up inside, then re-use them. But I would not count on 35+ yr old rubber going on much longer because of age.

#69310 - 04/07/07 7:29 pm Re: Norton isolastics  
Joined: Jan 2004
Posts: 1,106
Kommandokenny Offline
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Kommandokenny  Offline
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Joined: Jan 2004
Posts: 1,106
McKellar,Ontario
I agree with all the above, but just as a side note, I replaced mine in 95 with the harder rubbers, and just this winter switched back to my old, softer, 35 year old rubbers.

The bottom line is, you should inspect everything, front and rear.If the rubbers are still good reuse them. kk


If Norton made an airplane,would you fly in it?
#69311 - 04/07/07 8:35 pm Re: Norton isolastics  
Joined: Aug 2001
Posts: 1,253
Dave Comeau Offline
Crew Chief
Dave Comeau  Offline

Crew Chief

Joined: Aug 2001
Posts: 1,253
Hamilton, Mass. USA
The hard rubbers being offered in recent history are IMO just a marketing blitz $$$. They are definitely causing the buzz to continue much higher in the RPM range. For me anyway, clearly unacceptable.

If they are not oil soaked and turning into dissolving jelly, then I would reuse them, after disassembly and inspection.
Any settleing that may have occured, when removed and reinstalled, you may find a slight misalignment that seems unnerving upon reassembly. I have not found any problem with it in actual use.
I have recently gotten Norton Andover genuine new early type ISO's. laugh

Nice and soft bigt
I was so disheartened to think they were NLA.
The shim adjustment or Mick hemming type adjusters will do just fine for me....

If you want to see how bad (stiff) the new improved
:rolleyes: iso's are, you can judge for your self here.


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
#69312 - 04/07/07 9:48 pm Re: Norton isolastics  
Joined: Oct 2004
Posts: 307
debby Offline
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debby  Offline
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Posts: 307
Boulder, CO
I put a set of the Norvil vernier isos in my 750. Their rubbers feel a lot softer than the new Andover Norton ones (I have a set of those in the "useless spare parts" box - they're rock hard).

The bike smooths out pretty nicely at about 3K with the Norvil kit.

Debby

#69313 - 04/08/07 12:02 am Re: Norton isolastics  
Joined: Aug 2001
Posts: 1,253
Dave Comeau Offline
Crew Chief
Dave Comeau  Offline

Crew Chief

Joined: Aug 2001
Posts: 1,253
Hamilton, Mass. USA
Quote:
Originally posted by debby:
I put a set of the Norvil vernier isos in my 750. Their rubbers feel a lot softer than the new Andover Norton ones (I have a set of those in the "useless spare parts" box - they're rock hard).

The bike smooths out pretty nicely at about 3K with the Norvil kit.

Debby
I prefer physics and measurements over the uncalibrated fingertip.

smooth by 3K? :rolleyes:

Thanks, you prove my point


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
#69314 - 04/08/07 1:07 am Re: Norton isolastics  
Joined: Oct 2004
Posts: 307
debby Offline
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debby  Offline
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Joined: Oct 2004
Posts: 307
Boulder, CO
Quote:
Originally posted by dynodave:
I prefer physics and measurements over the uncalibrated fingertip.

smooth by 3K? :rolleyes:

Thanks, you prove my point
Hey, you're not supposed to go around lugging those engines! laugh

Debby

#69315 - 04/08/07 11:20 am Re: Norton isolastics  
Joined: Dec 2002
Posts: 706
beltdriveman Offline
BritBike Forum
beltdriveman  Offline
BritBike Forum

Joined: Dec 2002
Posts: 706
Guess if you all wait long enough Mr Hayward will come up with a large assortment of different iso lumps so everyone can tune thier own vibes!!!! After all he offered Triumph owners different clutch shock absorber ones so they could go and play silly buggers... and make greater shock load increasers?
Isnt 3000rpm below tickover??? Dont think any of my Norton twins ever saw 3000 except when firing the motor up, turning it off or slowing down.....probably why they never stayed together for long...helped by my mechanical incompetence of course!!!
Ever considered Mr Hemmings etc might all get their ISO rubbers from the same supplier and the brain dead awho shoves the buckets of gunge into the mix cannot count above two so one can end up with anything with each batch giving different results ..... Wonder what the effect is of getting a mix of different ones when shoving a bike together?????? Will the motors vibrate at different frequencies on the TS and the DS????
Tee Hee.

#69316 - 04/08/07 11:55 am Re: Norton isolastics  
Joined: Jul 2005
Posts: 1,919
John RGS Offline
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John RGS  Offline
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Joined: Jul 2005
Posts: 1,919
new jersey usa
Quote:
Will the motors vibrate at different frequencies on the TS and the DS????
Might make for sweet music O beltdriven one!


,_o
_ -\_<,
(*)/'(*)

NOPGS #2
#69317 - 04/08/07 10:13 pm Re: Norton isolastics  
Joined: Oct 2004
Posts: 307
debby Offline
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debby  Offline
BritBike Forum member

Joined: Oct 2004
Posts: 307
Boulder, CO
Quote:
Originally posted by John RGS:
Quote:
Will the motors vibrate at different frequencies on the TS and the DS????
Might make for sweet music O beltdriven one!
it's just a jump to the left
and then a step to the right...
wink laugh

Debby

#69318 - 04/08/07 11:26 pm Re: Norton isolastics  
Joined: May 2004
Posts: 557
jangg Offline
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jangg  Offline
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Joined: May 2004
Posts: 557
Norway, just south of Oslo
Yo, all!
Despite "curving" steps and jumps - gave *me* good vibrations in searching some answers regarding my isos. Original(without doubt...), dry, looking good, but orphans they are frown

thanks
jangg


'73 Commando Basket - new aluminium cyl
'93 Ducati 900 SS

"Better lit a light than cursing the darkness"
(Confucius)

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