Front Isolastic Mount Vernier Conversion, Won't Fit. What do I need?

The bike: 1971 750 Commando Roadster. I intended on converting the isolastic mounts over to the vernier style. I purchased a Front isolastic vernier conversion kit from my favorite supplier. Basically....it didn't fit. It is advertised as being a bolt on/drop in part p/n 06-7337). I have included some pictures to illustrate.



The first photo shows the new part, 06-7337 juxtaposed against the front mount (p/n 06-1410) and frame tabs. As you can see, the total stack stands proud by about 9-10mm on the right.



This next photo shows the STOCK arrangement with the outer collars fitting well within the mounting tabs on the frame. I should add that the frame mounting tabs are well within factory specs at about 155mm apart.




This photo shows the part I purchased, 06-7337 with the inner spindle but without it in the front engine mounting (p/n 06-1410). The inner stack is correct and fits perfectly! Apparently the front mount (p/n 06-1410) will not accommodate the stack.




These next two photos illustrate another potential problem insofar as the difference between the left hand collars; the 1st is the one I purchased, the 2nd in stock. There is about a 4mm difference, meaning that even if I were to install it, the engine would sit canted in the frame therefore causing perhaps significant alignment issues with the engine/transmission/frame.




Finally, this is the front engine mount with scribe marks on both sides. I put these scribe marks in order to illustrate the amount of metal that I assume would need to be removed in order for the measurements to be the same as stock and for the new part to fit. The reason I mention this is because I have read in some of the forums and blogs that the older style isolastic front vernier conversion required that the metal be removed.

My customer service guy (who is top-notch) said that the kit I bought was a Wassel as opposed to an Andover.

Someone please explain this to me. Thanks in advance.

Banzaibob816 said:

The bike: 1971 750 Commando Roadster. I intended on converting the isolastic mounts over to the vernier style. I purchased a Front isolastic vernier conversion kit from my favorite supplier. Basically....it didn't fit. It is advertised as being a bolt on/drop in part p/n 06-7337). I have included some pictures to illustrate.

View attachment 130604

The first photo shows the new part, 06-7337 juxtaposed against the front mount (p/n 06-1410) and frame tabs. As you can see, the total stack stands proud by about 9-10mm on the right.

View attachment 130605

This next photo shows the STOCK arrangement with the outer collars fitting well within the mounting tabs on the frame. I should add that the frame mounting tabs are well within factory specs at about 155mm apart.

View attachment 130606


This photo shows the part I purchased, 06-7337 with the inner spindle but without it in the front engine mounting (p/n 06-1410). The inner stack is correct and fits perfectly! Apparently the front mount (p/n 06-1410) will not accommodate the stack.

View attachment 130607View attachment 130608


These next two photos illustrate another potential problem insofar as the difference between the left hand collars; the 1st is the one I purchased, the 2nd in stock. There is about a 4mm difference, meaning that even if I were to install it, the engine would sit canted in the frame therefore causing perhaps significant alignment issues with the engine/transmission/frame.

View attachment 130609


Finally, this is the front engine mount with scribe marks on both sides. I put these scribe marks in order to illustrate the amount of metal that I assume would need to be removed in order for the measurements to be the same as stock and for the new part to fit. The reason I mention this is because I have read in some of the forums and blogs that the older style isolastic front vernier conversion required that the metal be removed.

My customer service guy (who is top-notch) said that the kit I bought was a Wassel as opposed to an Andover.

Someone please explain this to me. Thanks in advance.

Click to expand...

Looks like your trying to fit Mk3 vernier isolastics to the earlier front mount, the earlier mount is wider than the Mk3 mount. The earlier mount 'can' be cut down. But this needs to be done accurately, easier done with the use of a lathe

dobba99 said:

Looks like your trying to fit Mk3 vernier isolastics to the earlier front mount, the earlier mount is wider than the Mk3 mount. The earlier mount 'can' be cut down. But this needs to be done accurately, easier done with the use of a lathe

Click to expand...

These kits are sold as a "drop in" replacement. I understand that the earlier versions of the conversion kit needed to be modified (cut) if they were going on a Mk1 or Mk2. But my understanding of the ad was that they will work without modification on the Mk1 and Mk2. CAVEAT: I could be wrong....I could've read the ad wrong.

I do have a lathe. My concern is going in blind without any informed advice. IF....I have an "earlier" kit....I'm sure someone has experienced this problem before, even to the extent that they may know the exact amount that needs to be cut.

That is the MK3 kit so the mount needs to be cut down. https://norvilmotorcycle.co.uk/ Tech Talk, Mk3 Isolastic kit. So you've either bought or been sent the wrong kit.