Malcolm Cox (new chrome plated steel jota mufflers)
- Thread starter mauricejota7604
- Start date
G
Grant
Guest
I've had a chat with Malcolm and he points out that the design is as per the original Jota silencer design, regarding the end cap profile.
In addition, it was an optical illusion as the pipe diameters are as original.
The end cap looks different to my Keihan stainless pipes as the Keihan was not an exact copy of the original chromed steel pipes.
He has invested a lot of money so far to produce these and will ultimately make collectors and downpipes as well.
We need all the guys we can find like him to re-fabricate stuff to keep our clunkers on the road.
In addition, it was an optical illusion as the pipe diameters are as original.
The end cap looks different to my Keihan stainless pipes as the Keihan was not an exact copy of the original chromed steel pipes.
He has invested a lot of money so far to produce these and will ultimately make collectors and downpipes as well.
We need all the guys we can find like him to re-fabricate stuff to keep our clunkers on the road.
3
3patC
Guest
Grant, I was thinking that an index of remanufactured/improved parts would be very useful.
There have been a number of people posting on the site for the first time looking for items (I think?).
I was talking to a guy the other day, he has several Laverdas and he knew nothing of Reds ingition and alternator upgrade for instance.
Malcolm is making Jota silencers, Boba is making lots of 'bodywork' items, Keith makes hydraulic cluch conversions, Red makes new ignition and charging systems, Gavin Spencer made some nice chainguards etc etc.
It could be a useful tool both for owners and manufacturers.
....or is it a daft idea?
There have been a number of people posting on the site for the first time looking for items (I think?).
I was talking to a guy the other day, he has several Laverdas and he knew nothing of Reds ingition and alternator upgrade for instance.
Malcolm is making Jota silencers, Boba is making lots of 'bodywork' items, Keith makes hydraulic cluch conversions, Red makes new ignition and charging systems, Gavin Spencer made some nice chainguards etc etc.
It could be a useful tool both for owners and manufacturers.
....or is it a daft idea?
G
Grant
Guest
I think it's a great idea, but I am fed up asking for a Wiki-type depository for these gems, as we had in Laverdapedia.
Technical knowhow, how-to, who-does-what etc.
Much better than being buried away in a thread somewhere, or placed in a sticky.
Technical knowhow, how-to, who-does-what etc.
Much better than being buried away in a thread somewhere, or placed in a sticky.
Yogi
Hero member
- Location
- Bellingen NSW Australia
I just rang Malcolm Cox on his phone number and had a good chat with him about the mufflers, having emailed him and received a swift reply.
What a thoroughly pleasant man to deal with...
Yogi
What a thoroughly pleasant man to deal with...
Yogi
Monty500
Hero member
- Location
- Bodmin, Cornwall
3
3patC
Guest
Yes, they're good 
L
lemonjelly
Guest
Look superb,lucky I don t need a pair!,will be interested when collectors and downpipes are available.
Yogi
Hero member
- Location
- Bellingen NSW Australia
Thanks for the photos - they look great.
I've just ordered a pair and also some new downpipes and collector to be sent when they become available.
I'm interested to see the 750 pipes that will be available later on as well.
Yogi
I've just ordered a pair and also some new downpipes and collector to be sent when they become available.
I'm interested to see the 750 pipes that will be available later on as well.
Yogi
troutbishop
Hero member
- Location
- Worcestershire England
They look great can't wait to pick up mine . you can't knock Malcolm all the spares he sells and jobs he does are top class even his lamposts 
Kev
. you can't knock Malcolm all the spares he sells and jobs he does are top class even his lamposts Kev
Allan R
Senior member
- Location
- North Worcestershire
troutbishop said:They look great can't wait to pick up mine
Kev
Couldn't agree more, he certainly saved my bacon when the Sprint self distructed. A top guy to deal with.
Al
gibbo-123
Full member
- Location
- Warwickshire,UK
Yogi said:
Don't have a Jota so looking forward to the production of 750 silencers of the same quality.
Stu
Monty500
Hero member
- Location
- Bodmin, Cornwall
Quick email from Malcolm Cox regarding the pipes originality:-
Jota Silencers, design and originality. From Malcolm Cox, Cox Engineering.
When I was 18 years old, now 55, I used to use a chromium platers and polishers on the Stratford Road Birmingham called Sharrows, which was next door to Vale- Onslow motorcycles, which is well known worldwide.
The forman polisher, Billy Singh was then and still is a good friend of mine, and used to do all my polishing and plating in my early days and for my companyCox Engineering. Whilst at his premises he gave me some silencers, these turned out to be for one of his customers, Tim Healey. These silencers we still have as samples.
On speaking to Richard Slater from Slater Laverda a good friend of mine I have discussed the originality of these from day 1.
They were designed by Slaters in about 1974. The originals were made in Erith in Kent, but the volume of production could not be maintained for the supply of bikes being sold.
This is where Slaters commisioned Tim Healey who took over production and he then produced all the larger production runs for many years untill around 1980.
During the late 1970's I started to produce these, and copied the Tim Healey silencers exactly, totally down to the way they were assembled and welded.
Some years later Campbells from Cannock also added them to their range, and also supplied the factory at Breganze Via through Slaters. There were complaints from the factory about quality and fitting, certainly the design with the big thick welds around them and lenghwise were/are unsightly.
Basically, they were a cheap poor copy of the earlier Healey pipes. Campbells also had many problems with cracking and added a bracket to stop this, this was a rust trap......... Campbells continued until Mr. Campbell died some 14 years ago approx and the company folded.
At this period Harris Performance Products were commisioned by Slaters, also produced some, and several non laverda small outfits, all were of reasonable quality and filled the gap in the market at that time.
As so many were on the market I stopped producing after making 450 pairs, mostly chrome, and some stainless. My production process was and is more costly as I remove all the welds as per the originals, and became un-competitive.
Also in the meantime, stainless appeared from Keihan, who do produce a fair quality product, and have filled the gap for many years.
But no chrome has been available for many years at all.
As we all know, and was our experience, stainless is not a good material to use for silencers as when it gets hot/cold it work hardens, this then will fracture and I certainly do not want to critisize any product, but the history shows the problems are evident, most collectors in stainless do crack and the small plates welded on them moves the problem elsewhere
. The poor fitting by owners only added to the problems by "Making" them fit with persuasion!
Armours have also done a similar copy, but not to original spec.
The truth is non of the silencers ever made have ever fitted correctly. The reason for this is that the exhaust collector box does not sit/run in the middle of the engine, it sits to one side as the downpipes are separated by the cam chain tunnel.
All the "Jota" silencers made, including my early ones had the same lengh outlet so one side does not reach the collector properly and tends to blow past the end.
If this is compensated by moving the collector over, the silencers do go on, but this causes the silencers to be uneven from the back, this will also add to stress on welds.
The original 3c baffled silencers had different lengh tubes where they fit to the collector box. That is ok for a 180. But if you want to fit to a 120 they will not fit........
So, everyone makes them the same lengh so they do not actually" fit" either correctly. Jota silencers were never made to fit the 120, so have to be turned upside down to have any kind of incline at the rear.
We have inspected Tim Healey, Campbells, Keihan, Harris and my own from 14 years ago. All look very similar in design, all using slightly different production processes to save costs.
We also have seamless baffled silencers and the difference is plain to see especially once in our jigs, we also have the Campbells jigs as well so can compare
. The original design was based on the 3c seamless sets.
In the design of our new batch we went back to the drawing board and compared them all. We have copied the end caps from the Tim Healey silencers as we did in the late 70's and the fitting of the 3c genuine Laverda factory baffled silencers. The shape and size is exact to the Tim Healey spec in every way.
The end cap spinnings on many silencers made are not correct and have the wrong angles on them, again, not critisizing others, but they are the wrong design. Does this matter as stainless is not original anyway, but to the purist it does especially if you have a restored bike and want to get your restoration correct.
The pre-production silencers were fitted at Slater Laverda a couple of weeks ago and the fitting to a 1976 Jota and 1982 Jota is perfect. We have addressed the lengh of the fitting to collector box, and assured the fitting of the silencers to the bike is correct.
On the finish we again have removed all welds around the circumference and lengh, whilst not destroying the welds onto the tube going to the collector box, as removing them here weakens them.
As the value of our bikes has risen drastically it is apparent that most owners now want originality, and the design and appearance is all important, especially in chrome plated.
This is why we copied the Tim Healey early design, which can be described as "Original".
None of the Jota silencers ever fitted the 120 properly,and to address this we are producing something to fit properly, so they will not have to be turned upside down as a bodge up!
Delivery of the first batch will be by end of May or before and listed on the forum.
We are currently producing collector boxes and delivery is about 6 weeks, followed by downpipes for both 120 and 180 models.
We are now working on the full 750 range, 750S/SF/GT/GTL/SF1/2/3 both downpipes and silencers and balance box. also Monty 500, we have done these before, and 3c baffled silencers.
All will be to original design in every way, and polished and chromium plated to the highest standard.
We have no cost on these yet as not produced, but we would realy appreciate emails to guage the demand of quantity required, we have already had many enquiries about these and would like enquiries as to provisional orders.
It is the full intention to produce the full range for all models again to original specification and ship worldwide into the future. The demand will dictate the supply and we will invest if the demad is there.
We have already sold 33 sets of Chrome Jota silencers from the first batch of 50, price to be confirmed at around ?400 a pair plus delivery.
We are also taking orders on collectors and downpipes now, price to be confirmed later.
We hope this information will be of use to owners and will help in keeping classic bikes on the road.
All enquiries to Malcolm Cox at email.. coxeng@gmx.com ...or telephone UK 01789 400606, fax 01789 400808, International, 0044 1789 400606 or fax 0044 1789 400808.
For international, best to email due to time difference.
Supply will be by the manufacturer Cox Engineering and Slater Laverda who will also stock them.
Kind regards
Malcolm
Jota Silencers, design and originality. From Malcolm Cox, Cox Engineering.
When I was 18 years old, now 55, I used to use a chromium platers and polishers on the Stratford Road Birmingham called Sharrows, which was next door to Vale- Onslow motorcycles, which is well known worldwide.
The forman polisher, Billy Singh was then and still is a good friend of mine, and used to do all my polishing and plating in my early days and for my companyCox Engineering. Whilst at his premises he gave me some silencers, these turned out to be for one of his customers, Tim Healey. These silencers we still have as samples.
On speaking to Richard Slater from Slater Laverda a good friend of mine I have discussed the originality of these from day 1.
They were designed by Slaters in about 1974. The originals were made in Erith in Kent, but the volume of production could not be maintained for the supply of bikes being sold.
This is where Slaters commisioned Tim Healey who took over production and he then produced all the larger production runs for many years untill around 1980.
During the late 1970's I started to produce these, and copied the Tim Healey silencers exactly, totally down to the way they were assembled and welded.
Some years later Campbells from Cannock also added them to their range, and also supplied the factory at Breganze Via through Slaters. There were complaints from the factory about quality and fitting, certainly the design with the big thick welds around them and lenghwise were/are unsightly.
Basically, they were a cheap poor copy of the earlier Healey pipes. Campbells also had many problems with cracking and added a bracket to stop this, this was a rust trap......... Campbells continued until Mr. Campbell died some 14 years ago approx and the company folded.
At this period Harris Performance Products were commisioned by Slaters, also produced some, and several non laverda small outfits, all were of reasonable quality and filled the gap in the market at that time.
As so many were on the market I stopped producing after making 450 pairs, mostly chrome, and some stainless. My production process was and is more costly as I remove all the welds as per the originals, and became un-competitive.
Also in the meantime, stainless appeared from Keihan, who do produce a fair quality product, and have filled the gap for many years.
But no chrome has been available for many years at all.
As we all know, and was our experience, stainless is not a good material to use for silencers as when it gets hot/cold it work hardens, this then will fracture and I certainly do not want to critisize any product, but the history shows the problems are evident, most collectors in stainless do crack and the small plates welded on them moves the problem elsewhere
. The poor fitting by owners only added to the problems by "Making" them fit with persuasion!
Armours have also done a similar copy, but not to original spec.
The truth is non of the silencers ever made have ever fitted correctly. The reason for this is that the exhaust collector box does not sit/run in the middle of the engine, it sits to one side as the downpipes are separated by the cam chain tunnel.
All the "Jota" silencers made, including my early ones had the same lengh outlet so one side does not reach the collector properly and tends to blow past the end.
If this is compensated by moving the collector over, the silencers do go on, but this causes the silencers to be uneven from the back, this will also add to stress on welds.
The original 3c baffled silencers had different lengh tubes where they fit to the collector box. That is ok for a 180. But if you want to fit to a 120 they will not fit........
So, everyone makes them the same lengh so they do not actually" fit" either correctly. Jota silencers were never made to fit the 120, so have to be turned upside down to have any kind of incline at the rear.
We have inspected Tim Healey, Campbells, Keihan, Harris and my own from 14 years ago. All look very similar in design, all using slightly different production processes to save costs.
We also have seamless baffled silencers and the difference is plain to see especially once in our jigs, we also have the Campbells jigs as well so can compare
. The original design was based on the 3c seamless sets.
In the design of our new batch we went back to the drawing board and compared them all. We have copied the end caps from the Tim Healey silencers as we did in the late 70's and the fitting of the 3c genuine Laverda factory baffled silencers. The shape and size is exact to the Tim Healey spec in every way.
The end cap spinnings on many silencers made are not correct and have the wrong angles on them, again, not critisizing others, but they are the wrong design. Does this matter as stainless is not original anyway, but to the purist it does especially if you have a restored bike and want to get your restoration correct.
The pre-production silencers were fitted at Slater Laverda a couple of weeks ago and the fitting to a 1976 Jota and 1982 Jota is perfect. We have addressed the lengh of the fitting to collector box, and assured the fitting of the silencers to the bike is correct.
On the finish we again have removed all welds around the circumference and lengh, whilst not destroying the welds onto the tube going to the collector box, as removing them here weakens them.
As the value of our bikes has risen drastically it is apparent that most owners now want originality, and the design and appearance is all important, especially in chrome plated.
This is why we copied the Tim Healey early design, which can be described as "Original".
None of the Jota silencers ever fitted the 120 properly,and to address this we are producing something to fit properly, so they will not have to be turned upside down as a bodge up!
Delivery of the first batch will be by end of May or before and listed on the forum.
We are currently producing collector boxes and delivery is about 6 weeks, followed by downpipes for both 120 and 180 models.
We are now working on the full 750 range, 750S/SF/GT/GTL/SF1/2/3 both downpipes and silencers and balance box. also Monty 500, we have done these before, and 3c baffled silencers.
All will be to original design in every way, and polished and chromium plated to the highest standard.
We have no cost on these yet as not produced, but we would realy appreciate emails to guage the demand of quantity required, we have already had many enquiries about these and would like enquiries as to provisional orders.
It is the full intention to produce the full range for all models again to original specification and ship worldwide into the future. The demand will dictate the supply and we will invest if the demad is there.
We have already sold 33 sets of Chrome Jota silencers from the first batch of 50, price to be confirmed at around ?400 a pair plus delivery.
We are also taking orders on collectors and downpipes now, price to be confirmed later.
We hope this information will be of use to owners and will help in keeping classic bikes on the road.
All enquiries to Malcolm Cox at email.. coxeng@gmx.com ...or telephone UK 01789 400606, fax 01789 400808, International, 0044 1789 400606 or fax 0044 1789 400808.
For international, best to email due to time difference.
Supply will be by the manufacturer Cox Engineering and Slater Laverda who will also stock them.
Kind regards
Malcolm
Simonr501
Hero member
- Location
- Lympne, Kent. UK
Looks good and attention to detail bar none.
I will offer up my Jota 120 at some point as this does not seem to be catered for, I will contact Malcolm.
The silencers most definitely do NOT require to be turned upside down on my Armour S/S version. I can only assume that my bike has the same exhaust as the 180?
I will offer up my Jota 120 at some point as this does not seem to be catered for, I will contact Malcolm.
The silencers most definitely do NOT require to be turned upside down on my Armour S/S version. I can only assume that my bike has the same exhaust as the 180?
3
3patC
Guest
Grant said:
Boba pointed me in the direction of Laverdapedia who have just started this. Looks good.
G
Grant
Guest
Do you mean Laverdamania?
Simonr501
Hero member
- Location
- Lympne, Kent. UK
Thanks Piet,
It is sometimes difficult as many people do not differentiate between the Jota 120 and the 'other' 120's (RGA, RGS, Sprint, SFC 1K).
It is sometimes difficult as many people do not differentiate between the Jota 120 and the 'other' 120's (RGA, RGS, Sprint, SFC 1K).
G
Grant
Guest
Easy, just look at them. 