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Post by cigale13 on Jul 27, 2021 14:01:17 GMT 1
Good morning, everyone. I am French and I restore a RD 350 31K (07/1983). The forum is very active, I read it for months. Today, I took the step, I signed up to discuss and get the right advice. I’m new, can I ask you a question? I have a problem with the front caliper joints, they are too narrow because they move in the ribs of the caliper, there is a lot of play in. I recommended a joint kit from another supplier, but the problem is the same. I’m going crazy with this problem. Thank you for your thoughtful remarks and advice. I apologize for mistakes in writing English. www.hebergeur-image.com/] [/URL] www.hebergeur-image.com/] [/URL] www.hebergeur-image.com/] [/URL] |
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Post by midlifecrisisrd on Jul 27, 2021 18:54:35 GMT 1
Hi and welcome
It does look like the outer dust seal is way too thin
Have you tried to find a genuine Yamaha kit?
Steve
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Post by cigale13 on Jul 27, 2021 19:12:46 GMT 1
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Post by midlifecrisisrd on Jul 27, 2021 19:30:33 GMT 1
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Post by JonW on Jul 28, 2021 4:53:17 GMT 1
Welcome!
Ive used lots of yambits piston kits and they have been fine. I did have a problem of one missing seal ages back and I emailed them and they sent it out to me. Have you contacted them?
Before we jump on the yambits are rubbish train; a thought... Perhaps someone swapped your calipers?
We often say the XJ550 (and some other bikes) have the same caliper as the LC2... but I'm wondering now if maybe they look the same but actually have different seals?
I did a quick check on yambits and the calipers for the LC2 and the XJ550 have different numbered seal kits. If you measure your caliper 'seal slots' maybe you could ask them to check measure their kits that they sell for bikes with calipers that look the same, but maybe use slightly thicker seals?
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Post by cigale13 on Jul 28, 2021 14:05:10 GMT 1
When I removed the old original seals, there was no rib on the narrowest seal. My 31K is one of the very first, imported into France.
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Post by cigale13 on Jul 28, 2021 14:18:36 GMT 1
This picture  |
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Post by JonW on Jul 29, 2021 2:01:34 GMT 1
Its not about the old seals though, new seals are often different shapes (flat, ridged etc) especially when bought aftermarket. Even OEM seals change shape over the years depending on the supplier.
As suggested: Measure where the seals fit inside the caliper and send that size info and photos you posted here to Yambits customer service and ask them if you have the wrong kit or if there is some other issue or if there are other kits with the seals that will fit your caliper. As I said a different kit may be what you need for whatever reason, the important thing is to have the right seals, no matter what model they have on the packet.
For what its worth, ie my 2c: Just buying more kits from other places when you could possibly have a caliper that is different to the majority of other LC2 (early bike or swapped caliper etc) will not help if everyone sends you the normal seals, it will just waste time and money and annoy you I would think - I know for me it would.
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Post by cigale13 on Aug 20, 2021 16:14:04 GMT 1
I got a new kit from CSML, and I have the same problem. I don’t know if the front brake calliper are original, so I’m gonna try and find some more callipers.
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Post by cigale13 on Aug 31, 2021 13:45:25 GMT 1
I bought another pair of calipers, they’re the same.
So I ordered again but now at YAMAHA France.
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Post by cigale13 on Aug 31, 2021 13:56:38 GMT 1
 I received the front cylinder master kit (YAMAHA), but where does the washer fit into the assembly? |
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Post by Robbieben on Aug 31, 2021 14:02:18 GMT 1
I received the front cylinder master kit (YAMAHA), but where does the washer fit into the assembly? The washer fits under the circlip. Fit the internal piston and spring etc, then the waher, then secure it all with the circlip and finally fit the rubber boot. |
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Post by cigale13 on Aug 31, 2021 21:33:39 GMT 1
Thank's for the explanation.
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Post by cigale13 on Sept 2, 2021 20:39:38 GMT 1
I received the kit from YAMAHA part number 4X8-W0057-00.
Unfortunately, the same problem continues.
The ribs of the caliperr is 0.15748 in, the seal is 0.1377 in.
Is this normal? Many of you have restored a 31k. Do you remember this clearance ?
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Post by JonW on Sept 3, 2021 0:37:38 GMT 1
Never had a problem and Ive done two sets of LC2 recently.
I can only think its the wrong kit or caliper.
Did you contact Yambits and ask them if they did a kit with the larger seal as I mentioned above?
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Post by lc350pete on Sept 3, 2021 8:29:41 GMT 1
I would also contact powerhouse I used their seals their seals are good quality
They do brake parts for a range of motorbikes if you give them your measurements they will be able to help you
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Post by cigale13 on Sept 3, 2021 8:32:28 GMT 1
Yambit just says their joints are ok.
The calipers are good, because I bought 2 more calipers disassembled on a 31K.
In summary:
YAMAHA, CSML and YAMBIT bad reference.... I doubt it, and calipers are the origins.
If, fortunately, a forum member had these joints, could he measure them?
My restoration has been stopped for 2 months, I do not know what to do and I have already spent 300€ for nothing.
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Post by midlifecrisisrd on Sept 3, 2021 8:39:35 GMT 1
Unlikely as you say that all 3 are wrong
Personally as it is just the dust seal it smear the groove with red rubber grease, fit the seal and piston and see how it goes
0.02 inch clearance is about 0.5mm so should be fine
Just check the piston moves freely
It does look loose but it's years since I serviced a standard caliper so have no memory of it
Steve
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Post by JonW on Sept 4, 2021 2:28:38 GMT 1
I think unless you can find someone to sell you a seal of the correct size from your measurements then you will need to just use what you have as Steve says.
Sounds bad, but this is not the end of the world. The seal is the dust seal and not the one the piston rides on and seals it from the brake fluid. This one only takes care of the dust and acts as a scraper, it does not hold the piston, race bikes do not have these fitted etc. Its also a small seal so not going to cause a lot of drag if it does move.
With that said, if you cannot find the size that perfectly fits from the sellers, you will only have the option to use it as it is i guess.
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Post by cigale13 on Sept 4, 2021 20:55:45 GMT 1
The seal is not the dust seal, but it is the seal it on which the piston moves.
In summary :
The small seal (dust) measures 0.1181 and the rib 0.118, all is right.
But the seal of fluid break (the seal it on witch the piston moves) mesures 0.1377 and the rib 0.1574 ...
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Post by JonW on Sept 5, 2021 0:22:21 GMT 1
Ahh ok. I didnt realise that.
I can only advise that you contact sellers of seals and seal kits and ask them if they sell a seal in the size you need. Or you will need to make them I guess.
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Post by cigale13 on Sept 7, 2021 8:21:06 GMT 1
Power house doesn’t, I contacted them.
The simplest, it seems to me, is that a forum member with this 31K joint can measure the width. It would be ideal for the continuation of the restoration...
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Post by cigale13 on Sept 14, 2021 21:17:29 GMT 1
I’m stuck, doesn’t anyone have that gasket kit to measure it?
Thank you
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Post by midlifecrisisrd on Sept 14, 2021 21:51:22 GMT 1
Sorry but I don't have one
Hope you get an answer
Steve
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Post by JonW on Sept 15, 2021 2:55:39 GMT 1
All the ones I have are already inside calipers and on bikes, sorry.
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Post by cigale13 on Sept 15, 2021 21:47:10 GMT 1
No chance for me ...
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Post by JonW on Sept 16, 2021 2:05:50 GMT 1
Time to contact all the part suppliers and find someone to make the seal that you need. Im sure someone will be able to cut these for you. All is not lost.
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Post by coolray on Sept 16, 2021 8:14:49 GMT 1
I had same problems with dust seals etc .. took all the gubbins to a specialist brake place and he said leave out the dust seal it traps moisture between the hudraulic and dust seal and causes pitting near the piston rims .. he does cars, trucks and bikes whatever and never fits the dust seals .. sold me all the seals (incl dust seals because i was skeptical) i paid around 5$US for all the seals back and front .. straight off his shelf, straight into the bike and works perfectly, The seal isnt a rare size .. and is cheap .. the expensive part is the yamaha stamp. specialist seal places will also make you one for next to nothing .. just take the caliper and piston to them and they make it to exact measurement - no drama .. for mere cents.
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Post by cigale13 on Sept 24, 2021 20:27:12 GMT 1
I’m willing to buy the right kit in England, because here in France, nobody makes the gasket on demand.
Already 2 months I’m stopped in my restoration ...
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Post by lc350pete on Sept 25, 2021 17:12:28 GMT 1
As you have a spare set of Calipers that you bought maybe you could send one away to a company that refurbishes Calipers
They would then be able to sort out the correct seals and you could ask for spares the same sizes
I think powerhouse do recons but I’m not 100 percent sure
Expensive way of doing it but at least should enable you to continue with your bike
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