Iso's, adjustable V/ Non adj, + Hemmings???

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gtsun

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My front Iso needs some love, new gaiters and the bolts are all a bit rusted etc so naturaly I start over thinking about a whole new adjustable one with fresh paint and stainless everything. (1973 850 ) Question is this. I seem to remember someone saying that Mick Hemmings makes/sells one that is better then the typical MK3 conversion. Can someone tell me why? Also I think Grandpaul ? You said you sell Stainless ones of great quality. Please do tell? Also I came across a few old threads where people said not to convert to the MK3 style, they seemed to think the old style was the best. Why??? Oh I do have the ability to mill down my cradle so the hassel of doing that is not a factor. Thanks, Glenn.
 
Just installed GrandPaul's SS Mk3 Iso in the front cradle of my 74 850. It was a relatively easy install, if you discount all the cleaning of the old rubber, and no milling was required. Bike is transformed and handles like it should. No milling of the cradle required. GrandPaul's kit includes everything except the through-bolt and end-caps, which you can get in SS from other sources if you care (I did not). Very pleased with the results.
 
gtsun said:
My front Iso needs some love, new gaiters and the bolts are all a bit rusted etc so naturaly I start over thinking about a whole new adjustable one with fresh paint and stainless everything. (1973 850 ) Question is this. I seem to remember someone saying that Mick Hemmings makes/sells one that is better then the typical MK3 conversion. Can someone tell me why? Also I think Grandpaul ? You said you sell Stainless ones of great quality. Please do tell? Also I came across a few old threads where people said not to convert to the MK3 style, they seemed to think the old style was the best. Why??? Oh I do have the ability to mill down my cradle so the hassel of doing that is not a factor. Thanks, Glenn.
Click to expand...

If anyone knows where to get ISO gaiters that last more than 1 year please post it. :( :(
 
I did the MKIII conversion when I had my engine out for other reasons, and have mixed feelings about it. The plus side is that they're incredibly easy to adjust now. The down side is that I have a bit more vibration than I had with the stock shims. My kit came from a reputable eBay vendor and I believe they're Norvil parts. The vibration is acceptable but doesn't magically switch "off" at 3000 rpm like it used to.

Would I do it again? Yes. My rear iso buffers were sagging, so replacement was necessary anyway and who knows what the new ones would be like. It's a helluva lot easier to tweak the iso collar a notch to compensate for stiff buffers than it is to shim the stock rear setup.
 
I've had the shim, MkIII, and Hemmings. I like the Hemmings. The MkIII design has the rubber bushes bonded to a long sleeve with threads on the end where the adjustment is made. Which means the mounts have to be loosened to make adjustments. Aside from the inconvenience, the wall thickness of the sleeve isn't up to it and even if you use a torque wrench it's guesswork what you get for clearance when you tighten it back up, and you are stuck with what whatever rubber bushes it comes with which you may not like. On the other hand, you can fudge a few thou on the adjustment by leaning on the wrench a little.
 
Glenn ,the front iso is the easiest one to play with,the rear a pain ,so I would go vernier on the rear just to avoid the shimming process. That said Crazy Combat does not like much the system installed at present as vibration seems consistent throughout the R.P.M. range and she is asking for a change back to vibration up to 2700 R.P.M. then smooth as silk after. I have heard rumour of someone drilling out the rubbers to obtain more "free bounce" and if anyone could comment on this or how to obtain stock behaviour would appreciate a post. Dreading the big teardown at present as just did it to install only 9 mos. ago , oh well ,could use it for an oil filter ,battery securing system etc... no brand name given to stay cool.
 
DON'T FORGET, the book spec for adjustment clearance is your STARTING POINT. You have to tune them to suit your bike. Try a bit tighter, test ride; perhaps a bit looser, test ride again. You'll find the right setting for your bike. Should be able to tune out the vibes almost completely. It COULD take a bit more work, maye tighter in front, looser in back; or vice-versa.
 
Grandpaul,
What is the deal on your vernier iso's? I don't see them on your web site unless I'm just stupid. I could be interested in a set for my '69 now that everything else is done. Only thing is I really don't want to be doing any machining of the mounts and will my old rubbers fit?

You can PM if you like or just respond here, doesn't matter to me, I'm sure others would like to know too.

It could be a nice Christmas present and keep me from getting depressed now that the bike is done and winter is setting in.

Dave
69S
 
$325 to your door (in the U.S.)

Complete kit front & rear, with PTFEs & rubber booties.

You do need to have good mounting tube end caps, and good through-bolts & hardware. no mods required.

BUT WAIT! THAT'S NOT ALL!!

You also get a nice new U.S.postal flat rate mailing box with your address already on it!

Act now, while supplies last...
 
All my innards are new, including the PTFE washers. Can I get just the bolts, nuts and endpieces? Will my old rubbers fit over the new items?

Dave
69S
 
DogT said:
All my innards are new, including the PTFE washers. Can I get just the bolts, nuts and endpieces? Will my old rubbers fit over the new items?
Click to expand...

Yes, I can get any of the individual bits new. Which endpieces? I need part numbers!
 
Well, I reckon if I use my old nuts, bolts, tube caps, boots, sleeves, donuts and one collar, front and rear, it seems all I need is the adjustable collar to replace one of the collars, 06-0422 front and 06-0436 rear. No? How does your adjustment work?

Dave
69S
 
DogT said:
Well, I reckon if I use my old nuts, bolts, tube caps, boots, sleeves, donuts and one collar, front and rear, it seems all I need is the adjustable collar to replace one of the collars, 06-0422 front and 06-0436 rear. No? How does your adjustment work?

Dave
69S
Click to expand...

Dave, it sounds like you might be thinking of the Hemmings kit. Page 26.
http://www.mickhemmings.com/cat/PriceList.pdf
 
Bob, I've seen the Hemmings adjusters, thanks. I doubt they are still £56. I am still wondering if GP's adjusters are the same. I can't imagine they all are that different. I just haven't seen a repository of information on all the different adjusters, but I am not interested in the ones I have to machine the early offset front and rear mounts which I think would be the Andover ones. I think even RGM and Norvil have them, it just seems so hard to get information on them, but I haven't really tried all that much. I just thought it would be a good thing to look into while the bike is up for the winter and Christmas is approaching.

Dave
69S
 
With the SS unit kits I sell, there is no machining or mods required for pre-MkIII mounts.
 
So, GP, if all my iso parts are good, can I just replace one of my fixed collars with your adjustable one, front and rear, and get rid of my shims? If that's how yours works, I'm assuming you have one of the collars adjustable so shims are not necessary, similar to the Hemmings collar? Or maybe you are using a different principle with your adjustable kits and I would have to buy some other parts? I don't know how your kit works.

Dave
69S
 
The inner isolastic tube spacing / threading is different to allow for zero mod "plug & play" to either mounting tube (MkIII or pre-MkIII) depending on which set you order. They won't just screw onto your tubes.
 
I think I see, yours are like Norvil ones, the sleeve with the donuts is threaded on both ends and then needs new threaded collars and the adjustment is made by the collars on the sleeve. Also the sleeve has bonded donuts, so the whole thing would need replacing. Thanks, I think I'll just go with the simpler Hemmings one since all my rubbers and washers are new. No use me replacing all the new parts with more new parts.

Thanks,
Dave
69S
 
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