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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Gabriel70 on February 09, 2019, 08:01:39 PM
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Hi
My seat lock is Broken and I was wondering if it can be repaired.
I think it’s made of metal.
I have attached a few photos.
Thanks
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greetings...
why you lock up your seat... you fear somebody gonna wanna thieve your torture plank... thats whack...
j o
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Mine's been broke since Reagan ruled DC. Gotta fix that someday.
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greetings...
why you lock up your seat... you fear somebody gonna wanna thieve your torture plank... thats whack...
j o
I thought it was a safety issue.
Isn’t it one of the anchor points for the seat?
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The photo indicates that the seat's latch is broken, not its lock. Of course, without a latch, the lock has no purpose.
The latch isn't about safety. It's used to enable the seat to be locked. Locking the seat makes stealing the moto's fuel injection control unit, battery, tool box and whatever is in the tool box and seat cowl slightly more difficult for casual or unmotivated thieves.
If you and your moto receive a hard impact, you'll likely be launched off the seat regardless of whether the seat latches. If you and your moto are knocked down and spin together along the pavement, you might get spanked by the latchless seat. You won't notice that because you'll be preoccupied by the rush of oncoming traffic. If you are hauling at high speed across a pothole field and get launched upward off the seat after hitting a deep one, the seat might open then the seat support lock open and when you come down, you might suffer a groin injury. That sums up the latch's safety roles, as I see them .
If it were made of steel billet, the latch could be TIG-welded. It's more likely to be made of cast metal and that is why it was broken rather than bent. A product like JB Weld applied according to instructions might repair the latch if the joint were allowed to cure for a couple of weeks. The seat post should then be aligned so it enters the latch hole cleanly. The latch/lock mechanism should be inspected to determine if it is positioned so it smoothly rotates backward to receive the seat latch post instead of getting smacked by the seat post. It should also be determined that the seat post easily rotates the latch backward then the latch springs forward into the post's receiving hole. When the lock button is pushed, the latch should release its grip on the post and the seat should open easily.
Keep your eyes open for used parts. New latch/lock assemblies might still be obtained. Check a parts fiche like MAX BMW's (https://shop.maxbmw.com/fiche/PartsFiche.aspx).
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Failing finding a second hand one, try local vintage car/motorcycle clubs. Local vintage clubs might know of a local tradesman doing smelting. We have a local trades guild with a smelting works and they make a lot of hard to obtain parts.They smelt jobs in copper, brass, aluminium, cast iron and gun metal. There are also members that have small smelters that they have at home and also do small jobs. Also try local mens sheds they also might have contacts.
Regards Martin.
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Tell us about the latch, Laitch.
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Tell us about the latch, Laitch.
You can't spell Laitch without a Latch
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greetings...
why you lock up your seat... you fear somebody gonna wanna thieve your torture plank... thats whack...
j o
[/quote
Hi
I’m just wondering it won’t pass a roadworthy check.
The seat is more stable and doesn’t move around as much when it is locked.
I don’t think that’s whack or is it?
Cheers
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It's whack if a country won't allow a moto on the road without its seat latching.
It's whack to spend time debating what is whack rather than attempting a repair, or contacting the MOT to determine if it will fail because the seat won't latch.
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It's whack if a country won't allow a moto on the road without its seat latching.
It's whack to spend time debating what is whack rather than attempting a repair, or contacting the MOT to determine if it will fail because the seat won't latch.
I was hoping some of you who always have an opinion might provide me with helpful advice.
There is no such thing as a silly question.
Not asking a question when you don’t understand a situation...now that is whack!
And yes it might be a safety issue..if the seat can not engage with the latch, it creates abnormal looseness...for a car, that’s a fail.
If I was to apply your logic latich, why not do away with all anchor points for motorcycle seats.
I think it’s important that a seat is securely fixed to the motorcycle. You don’t an abnormally loose seat when you re trying to ride a motorcycle.
There is a reason motorcycle seats are securely attached to the motorcycle.
The latch gives the seat a little bit of stability.
Slipping and sliding along...that’s whack......my word of the day...
These are just my opinions....
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I was hoping some of you who always have an opinion might provide me with helpful advice.
If I was to apply your logic latich, why not do away with all anchor points for motorcycle seats.
You have been given suggestions for repair and also been given a possible source for replacement of your defective seat latch.
The seat is attached by two pins on the brake side of the moto and also attached to the swiveling support connected to its mid-section and the seat pan. I explained what I view as the purpose of the latch. My logic applied only to the latch. It is your logic involved in removal of all attachment points.
Replace the entire latch and lock system if you want triangular attachment and security. That strategy has already been suggested. If you want to know whether not having the latch will cause your moto to fail the MOT inspection, contact the MOT.
In the meantime, you might thread a thin cable or wire through the seat post then affix it to the frame somehow, or wrap a strap over the seat then around the frame if you want the seat to be secure enough for you.
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Gabriel if you were closer I could get it cast for you, however cost would blow out with freight back and forth. We need the original part to copy and the casting would be cheap, probably done in brass as it's stronger. The dearer part would be machining. If you want a price let me know, but I only go to the Trades Guild Tuesdays and Friday's.
Regards Martin.
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quit yer bitchin'
https://www.ebay.com/itm/1985-BMW-K100-K-100-K100RS-OEM-SEAT-HELMET-LOCK-LATCH/253956281338?hash=item3b20f953fa:g:aM8AAOSwczdb17M4
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Gryph I'm not sure, but looking at the seat catch that is broken I believe it is of his 84 K100. It looks different to what I have. Date and model of bike needed. There are two BMW wreckers in Melbourne one in Coburg http://motorcycle-wreckers.com.au/ I think the other one is in Ringwood .https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwi_z9__trTgAhULfX0KHakGCVMQFjABegQIAhAC&url=http%3A%2F%2Fbmmotorcycles.com.au%2Fcontact%2F&usg=AOvVaw1nJDj1knsNUlIMKtzqBU87 There is also another one in NSW Graham Jays who i have dealt with goods prices and good service https://kmodelbeamerbits.com.au/. As far as casting is concerned before i moved up here i lived in Morwell and we had a couple of guys who used to cast Kart and motorcycle parts. Gabriel needs to contact local vintage Motorcycle and car clubs they would know of places to get parts cast if needed.
Regards Martin.
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quit yer bitchin'
https://www.ebay.com/itm/1985-BMW-K100-K-100-K100RS-OEM-SEAT-HELMET-LOCK-LATCH/253956281338?hash=item3b20f953fa:g:aM8AAOSwczdb17M4
Famous Aussie quote.....”relax”.....
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Which Melbourne suburb you in.
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Gryph I'm not sure, but looking at the seat catch that is broken I believe it is of his 84 K100. It looks different to what I have. Date and model of bike needed. There are two BMW wreckers in Melbourne one in Coburg http://motorcycle-wreckers.com.au/ I think the other one is in Ringwood .https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwi_z9__trTgAhULfX0KHakGCVMQFjABegQIAhAC&url=http%3A%2F%2Fbmmotorcycles.com.au%2Fcontact%2F&usg=AOvVaw1nJDj1knsNUlIMKtzqBU87 There is also another one in NSW Graham Jays who i have dealt with goods prices and good service https://kmodelbeamerbits.com.au/. As far as casting is concerned before i moved up here i lived in Morwell and we had a couple of guys who used to cast Kart and motorcycle parts. Gabriel needs to contact local vintage Motorcycle and car clubs they would know of places to get parts cast if needed.
Regards Martin.
Martin, as far as I can tell, the lock I posted is used on all K bikes that don't have low seats from at least '84 up to the 1100's. I suspect the part he is looking for is inside the latch assembly. A little more detail and a photo of where his part came from wouldn't hurt.
I suppose it could be a latch for a low seat. I've never seen a bike with one of those seats up close to know what the latch looks like.
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Which Melbourne suburb you in.
Altona....
I’m sorry if I appear to be whiny..
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Gryph I'm not sure, but looking at the seat catch that is broken I believe it is of his 84 K100. It looks different to what I have. Date and model of bike needed. There are two BMW wreckers in Melbourne one in Coburg http://motorcycle-wreckers.com.au/ I think the other one is in Ringwood .https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwi_z9__trTgAhULfX0KHakGCVMQFjABegQIAhAC&url=http%3A%2F%2Fbmmotorcycles.com.au%2Fcontact%2F&usg=AOvVaw1nJDj1knsNUlIMKtzqBU87 There is also another one in NSW Graham Jays who i have dealt with goods prices and good service https://kmodelbeamerbits.com.au/. As far as casting is concerned before i moved up here i lived in Morwell and we had a couple of guys who used to cast Kart and motorcycle parts. Gabriel needs to contact local vintage Motorcycle and car clubs they would know of places to get parts cast if needed.
Regards Martin.
Hi
Thank you for your suggestions.
I a, familiar wit the businesses you mentioned.
I suppose I was looking for a simple solution , like glue.
Anyway, I will purchase a replacement part.
Bike is a 194 k100.
I was surprised that no one else thought my broken seat latch was an issue.
My seat is abnormally loose and I notice it when I am seated.
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quit yer bitchin'
https://www.ebay.com/itm/1985-BMW-K100-K-100-K100RS-OEM-SEAT-HELMET-LOCK-LATCH/253956281338?hash=item3b20f953fa:g:aM8AAOSwczdb17M4
Woof woof!
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Martin, as far as I can tell, the lock I posted is used on all K bikes that don't have low seats from at least '84 up to the 1100's. I suspect the part he is looking for is inside the latch assembly. A little more detail and a photo of where his part came from wouldn't hurt.
I suppose it could be a latch for a low seat. I've never seen a bike with one of those seats up close to know what the latch looks like.
Hi
The part I posted is one of the internal components.
This is the point of attachment for the seat.
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Gabe some cast parts can be welded and some can't. If you know of a good welder and I mean good get his opinion. Is the part in question ferrous or alloy. If it's ferrous you could braze it. I checked at the guild and it would cost $25.00 Au plus whatever the freight is back and forth.
Regards Martin.
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Gabriel, the part i posted the link for is probably where your broken part came from. If your time is valuable getting that part is going to be the fastest, best solution. The fact that it broke once means that almost any repair won't last longer than the first time the seat is stressed. I'm not even sure your seat latch hasn't been compromised by taking it apart. It appears the lock cylinders are removable so you should be able to switch your old lock into the new latch.
Sometimes you just have to bite the bullet...
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Gabriel, the part i posted the link for is probably where your broken part came from. If your time is valuable getting that part is going to be the fastest, best solution. The fact that it broke once means that almost any repair won't last longer than the first time the seat is stressed. I'm not even sure your seat latch hasn't been compromised by taking it apart. It appears the lock cylinders are removable so you should be able to switch your old lock into the new latch.
Sometimes you just have to bite the bullet...
Final question.......use a 3D printer?
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greetings...
drill it... tap it... stud it...
j o
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My opinion - replace the entire lock assembly. Any attempted repair will fail, as TMG rightly points out. Observe that the breakage occurred at a weak spot in the casting.
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I'm super unteck, so ignore this unless verified, but I think 3d printing is plastic, and I also think its not even durable plastic or strong enough.
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Finally, a subject on Motobrick that I'm knowledgeable about....3D printing!
There are metal 3D printers, you'll get parts slightly lower than cast strength but probably in a usable range for this application.
Most 3D printers print in plastic, some are pretty strong, it depends on the printing technology, part orientation, material, etc.
We have a 3D printer at work that prints a combination of plastic and carbon fiber, almost as strong as aluminum.....but only in the direction of the carbon fibers!
The first thing you'll need to do is find or create a CAD model of the part so you can output the STL file needed for printing.
You can look into a 3D printing service company if you want to go that route, most have multiple technologies and can even help model the part in CAD.
We've had good luck with ProtoLabs www.protolabs.com/ (http://www.protolabs.com/)
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greetings...
can make a sand mould and pour a new one...
j o
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There are sand mold 3D printers just for that purpose! (And engine blocks , etc.)
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greetings...
can getts a chunk of metal and a dremmil and commence to grinding...
j o
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Dull and rusty chisel would be better!
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You know which side is the clutch and which is the brake, right? Cause that can really F U P!! way more trouble than a loose seat........ :giggles just kiddin mate. When Johnny's not around, I have to "TRY" and fill the genius poster duties. Somebodies got to do it!
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:hehehe :clap: :wave: just tryin to keep it real Johnny!! Nice to know ya missed me! :kill-sword-dueling:
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This old man , he played two, (2)
He played knick knack on his shoe,
With a knick, knack, paddy whack,
Give the dog a bone;
This old man came rolling home.