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#592407 - 03/29/15 4:08 am Pre Mark-3 Isolastics?  
Joined: Aug 2005
Posts: 4,791
Kev. Online sick
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Kev.  Online Sick
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Royal Berkshire.
I need to do the front iso's on my 750, but which set do I need? I have seen this on eBay, are they right for my 73 roadster...

http://www.eBay.co.uk/itm/351343651783?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT


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1950 Vincent Comet
1952 Norton Special
1963 BSA Super Rocket
1970 BSA A65 Lightning
1973 Moto Guzzi Eldorado x2
2009 Triumph Bonneville (now sold)



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#592416 - 03/29/15 5:47 am Re: Pre Mark-3 Isolastics? [Re: Kev.]  
Joined: Dec 2004
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kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,893
Scotland
Do not buy ISO's from Norvil, they are built to a price and use an off the shelf tube which has too large an ID, the bearded one says they are OK but why risk it to line his pockets. Buy from Mick Hemmings, RGM or Andover Norton, if you ring them they can sort out the best version for you, best to go for vernier adjusters for pre-MK3 as for the front at least MK3 will not fit without some work.

#592417 - 03/29/15 6:06 am Re: Pre Mark-3 Isolastics? [Re: kommando]  
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Les P Online content
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Kiwi in Australia.
Originally Posted By kommando
RGM


I liked the RGM isolastics enough to buy another set for the Fastback along with the extended top fork bushes for both bikes (Mk2a and Fastback)




Last edited by Les P; 03/29/15 6:07 am.
#592420 - 03/29/15 6:18 am Re: Pre Mark-3 Isolastics? [Re: Kev.]  
Joined: Mar 2006
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L.A.B. Online content
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L.A.B.  Online Content
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Norfolk, UK
Originally Posted By Kev.
I need to do the front iso's on my 750, but which set do I need? I have seen javascript:%20void(0)this on ebay, are they right for my 73 roadster...


Yes, should be, although it isn't entirely necessary to replace the front engine mounting (061410) although I'd also suggest you buy the kit from Mick Hemmings or RGM.


Last edited by L.A.B.; 03/29/15 6:20 am.
#592422 - 03/29/15 6:42 am Re: Pre Mark-3 Isolastics? [Re: Kev.]  
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Peter R Online content
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Netherlands
Another vote for the Mick Hemmings iso adjusters.
Concerning the rubbers: make sure you buy the soft rubbers, many aftermaket iso rubbers are harder than the originals, and will transmit more vibration than the originals.
Don't ask me how I know..


Peter.
1974 Commando 850
1972 Trident T150T
1961 Goldie DBD34
1969 Benelli 250 sport special
#594068 - 04/08/15 5:07 pm Re: Pre Mark-3 Isolastics? [Re: Kev.]  
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Kev. Online sick
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Royal Berkshire.
I bought a vernier iso kit for my 750 commando, from Andover Norton, but all it came with was an
exploded diagram from the parts manual, . No instructions or anything on how to fit or set up??

Have any of you used the Andover kit, do I need to get the tube cut or is it all a straightforward fit?

frown


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1950 Vincent Comet
1952 Norton Special
1963 BSA Super Rocket
1970 BSA A65 Lightning
1973 Moto Guzzi Eldorado x2
2009 Triumph Bonneville (now sold)



#594078 - 04/08/15 6:08 pm Re: Pre Mark-3 Isolastics? [Re: Kev.]  
Joined: Mar 2006
Posts: 3,469
L.A.B. Online content
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L.A.B.  Online Content
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Norfolk, UK
Originally Posted By Kev.
I bought a vernier iso kit for my 750 commando, from Andover Norton


"Kit"?

06-7116 kit (front)?
06-7337 kit?


Originally Posted By Kev.
do I need to get the tube cut


Assemble the new end caps, PTFE washers and abutments onto the tube and measure the overall length and compare that to the original assembly and/or the gap between the frame plates.

If it's the 06-7337 pre-Mk3 conversion kit, then the tube doesn't need to be cut down:

http://www.andover-norton.co.uk/News.htm

Quote:

06-7337

New from Andover Norton is a Vernier adjustable front Isolastic engine mount kit for all Pre-Mk3 Commandos, which is any Commando before 1975 which used shim Isolastic adjustment.

The new kit has modified width abutment and adjuster end parts to suit the unequal length front engine mount tube on pre-1975 Commandos, and gives the ease of adjustment which is only normally found on the Mk3.
This kit makes the setting and adjusting of the Isolastic clearances a much faster job.




Last edited by L.A.B.; 04/08/15 6:40 pm.
#594214 - 04/09/15 5:21 pm Re: Pre Mark-3 Isolastics? [Re: Kev.]  
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Kev. Online sick
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Kev.  Online Sick
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I got this kit...



but where do the bits shown at the front go?


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http://backstreetthunder.wordpress.com/

1950 Vincent Comet
1952 Norton Special
1963 BSA Super Rocket
1970 BSA A65 Lightning
1973 Moto Guzzi Eldorado x2
2009 Triumph Bonneville (now sold)



#594223 - 04/09/15 6:07 pm Re: Pre Mark-3 Isolastics? [Re: Kev.]  
Joined: Mar 2006
Posts: 3,469
L.A.B. Online content
BritBike Forum member
L.A.B.  Online Content
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Joined: Mar 2006
Posts: 3,469
Norfolk, UK
Originally Posted By Kev.
but where do the bits shown at the front go?


The silver coloured items are the new tube caps (these replace 060684).
The bronze coloured items are the PTFE washers (replace 060578).

The clip, far left, fits over the movable adjuster to prevent crud blocking the adjuster rod holes.

Here's the instructions for the RGM vernier conversion kit which is basically similar to the AN kit as far as assembly and set up is concerned, so might give you an idea of how it fits together and how to adjust it, however it's not exactly rocket science.


http://www.rgmnorton.co.uk/csi/1245184/f/pdf/mk3_vernier_isolastic_instructions.pdf

I do recommend that you check the Iso. clearance with a feeler gauge after the assembly has been fully tightened, and I prefer not to rely on the instruction to: "back off the adjuster by 1.5 turns". Due to the necessary running clearance between the threaded parts of the adjuster some Iso. clearance can be lost when the bolt (and nut) is tightened.



#594290 - 04/10/15 9:50 am Re: Pre Mark-3 Isolastics? [Re: Kev.]  
Joined: Aug 2001
Posts: 1,253
Dave Comeau Offline
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Dave Comeau  Offline

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Joined: Aug 2001
Posts: 1,253
Hamilton, Mass. USA
Originally Posted By Kev.
I got this kit...



but where do the bits shown at the front go?


Gotta say I have been given one for free and would not use it. Maybe the newest and softest kits and then only on the heavier MKIII. In my test chart the brown kit is probably what you currently get. Notice the blue curve originally supplied on pre MKIII, which is about half the rate of the brown.
And then people are surprised that their preMKIII vibrate more than before. But for a lot of people marketing seems to trump engineering and science.
The Mick Hemmings adjuster (designed by an American) is IMO an acceptable/worthwile mod for reasons of adjustability.



dynodave
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