Rgs mounts

[Graeme mackay]

Hi there, thank you for accepting me into your forum, has anyone ever cleaned out an RGS engine mount and pressed in an alternative rubber mount

 

[arancia]

Hi there, thank you for accepting me into your forum, has anyone ever cleaned out an RGS engine mount and pressed in an alternative rubber mount

I don't know if he's an active participant in this forum but I do recall a conversation with "smiddy" about what he's been trying with different hardness polymers for his RGS mounts. If you're an ILOC member try posting this question in the club's forum where I have seen him participating - good if you can get a dialogue going on this topic.

 

[Graeme mackay]

I don't know if he's an active participant in this forum but I do recall a conversation with "smiddy" about what he's been trying with different hardness polymers for his RGS mounts. If you're an ILOC member try posting this question in the club's forum where I have seen him participating - good if you can get a dialogue going on this topic.

Thanks for your reply, i know Smiddy well and have seen the tool he made for repacking the mounts with poly, i was just curious to see if anyone had sourced any automotive suspension type of bush and pressed them into the housings with a bit of modification

 

[andre g]

Micheal Stöcker in Gemany had produced smaller and lighter rubber bushes. sport-connection.de
Andre

 

[martymoose]

When Piero was in Sydney in 2017, we asked him about the hardness of the rubber, no information was available. Seems the engine mounts came from a supplier, possibly similar to a combine harvester ......

 

[Graeme mackay]

Many thanks for all the info

 

[hooksey]

Hi there, thank you for accepting me into your forum, has anyone ever cleaned out an RGS engine mount and pressed in an alternative rubber mount

Hello Graeme,

Good to know this has come up for discussion in your part of the world. These Rubber mounts are getting to the end of there lifespan, and im sure there would be plenty of RG series owners thinking about replacing 40 yr old mounts, if a suitable replacement came to fruition.
I have a mate who works for Mackay Industries in Aus, that is trying to find a suitable solution......will keep one and all posted.

 

[Graeme mackay]

Thats good to know, cheers

 

[Laverdalothar]

When Piero was in Sydney in 2017, we asked him about the hardness of the rubber, no information was available. Seems the engine mounts came from a supplier, possibly similar to a combine harvester ......

He said to me once that the ones available by a Laverda-Dealer in southern Germany would be to soft, but the (at that time) only available ones. I assume, too, they are standard items, pressed into the metal holders maybe even in the Laverda factory!?

I assume they are like elastomer dampers (or "MO-bearing" or "Screw isolators") like these:

These are available in different shore values from 42, 45, 50, 55, 60, 64, 75 Shore A and sizes (33,48, 64,8 or 89 mm outer diameter), maybe one fits?!?

MO-Lager / Schraubenisolatoren - Produkte - a2tec.de

Informieren und bestellen Sie MO-Lager / Schraubenisolatoren bei a2tec, Ihrem Spezialisten für Schwingungstechnik und Abdichtung. Rufen Sie uns an uns lassen Sie sich beraten.

www.a2tec.de

 

[sfcpiet]

I assume they are like elastomer dampers (or "MO-bearing" or "Screw isolators") like these:

Nothing like that at all Lothar.

The originals are actually moulded/poured into the brackets. I found out the hard way that the tube used for the brackets differed, having different IDs, thoroughly crushing any attempts of finding a direct and easy replacement.

I did manage to find a couple of brackets that I could machine out cleanly (most were too large) in order to press in a set of automotive control arm rubbers (can't remember what they were for, got the label somewhere). I remember trawling catalogues for days to find something that would even remotely fit. Looked quite neat and was a little less clumsy than the original. Anyway, the outcome was pretty dismal. I fitted them to the front engine mount of my RGS, turned the bike into a horrible vibrator. Refitted the originals, vibes vanished.

It is imperative the original Shore rubber grade is determined first, don't know how much it changes with age. Possibly size/volume also has an effect.

This exercise is not as easy as it seems.

piet

 

[CLEMTOG]

Ralph at Mpotalia did at one time make replacements, they were available in the stock black steel as well as stainless housings, I was asked to buy a set for a very famous Laverda person, and told Ralph were they were going, he admitted that a crow bar was needed to get them in line, so I declined to buy them, but to give credit he sorted and made the housings which were a great job, getting the poured rubber done and everything central was no doubt a sub contract, and didnt work too well, but he tried and must have tried very hard, so close but no cigar, I wonder if he still has stocks, they may cause vibrations or not, no idea.
CLEM

 

[andre g]

These are the engine mounts from Michael Stöcker sport-connection.de
You can safe 1.6 kg

 

[Andy]

These are the engine mounts from Michael Stöcker sport-connection.de
You can safe 1.6 kg

Are you using these without problems or extra vibrations?
Were they custom made for you or does he have a template to make more for sale?

 

[andre g]

I havn‘t these mounts mounted so far, so I cannot answer the questions. Michael just asked me whether I can put the photos in the thread as he isn‘ t a member of the forum.
You have to ask him about his website directly.

 

[AJ]

I get a variety of wheels, dampers and bushes made up in Urethane. The supplier makes a mould for the wheels etc and pours the liquid Urethane of the required hardness into it. They also machine the urethane down to the required dimension. Not a cheap exercise but as always the price drops as the quantity goes up. I would expect a isolating mount to be a straight forward exercise. You need a Shore hardness meter to get the right Urethane or send them an existing mount.

 

[Andy]

I get a variety of wheels, dampers and bushes made up in Urethane. The supplier makes a mould for the wheels etc and pours the liquid Urethane of the required hardness into it. They also machine the urethane down to the required dimension. Not a cheap exercise but as always the price drops as the quantity goes up. I would expect a isolating mount to be a straight forward exercise. You need a Shore hardness meter to get the right Urethane or send them an existing mount.

Yes I just found a local company that specialises in rebuilding obsolete mounts for vehicles etc. so there must be a few places around.
Piet’s experience of making it worse is a bit of a worry, although presumably a specialist would have all the right gear.
I wonder if it would make a good difference. When I recall the big reduction in noise and snatch after replacing the primary chains and cush rubbers, I imagine that there would be an improvement, even if it seems fine now.

 

[AJ]

Yes I just found a local company that specialises in rebuilding obsolete mounts for vehicles etc. so there must be a few places around.
Piet’s experience of making it worse is a bit of a worry, although presumably a specialist would have all the right gear.
I wonder if it would make a good difference. When I recall the big reduction in noise and snatch after replacing the primary chains and cush rubbers, I imagine that there would be an improvement, even if it seems fine now.

If the Urethane is bonded to the inner and outer components of the mount the outcome is probably much better.

 

[martymoose]

Getting the right hardness is the issue, hence asking Piero. I have a spare set here which, when you guys work out the correct hardness, are ready for experiment. My 120 jota seems quite happy with its original flogged ones. Mackay engine mounts provided for cars seem to be too soft, whilst "Nolathane" nylon bushes are way too hard.

 

[Reunited Chris]

Many years ago a guy in Sydney had Nolathane bushes made for his RGA but they were too hard and the bike vibrated like a bastard, the bike was sold on too another person who drilled a series of 6mm holes through the nolathane which did resolve the vibration issue.
Determining the correct Duro number is the issue. Any body got a Durometer? Just where this bike is now I don't know.
For those in Sydney it was originally Crazy's RGA that was fitted with the SFC fairing, originally blue but later resprayed orange. The last owner I knew was Ray Caruanna who sold it on.

 

[AJ]

Many years ago a guy in Sydney had Nolathane bushes made for his RGA but they were too hard and the bike vibrated like a bastard, the bike was sold on too another person who drilled a series of 6mm holes through the nolathane which did resolve the vibration issue.
Determining the correct Duro number is the issue. Any body got a Durometer? Just where this bike is now I don't know.
For those in Sydney it was originally Crazy's RGA that was fitted with the SFC fairing, originally blue but later resprayed orange. The last owner I knew was Ray Caruanna who sold it on.

I have durometers for Shore A and D. They are relative cheap online now. Most shops that do this work will match a sample anyway. You need to have a box of inner sleeves and outer housings under your arm when you visit. You will be able to get a quote from a drawing. Hardness of Urethane will make very little difference to the price!