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Post by steve63 on Aug 21, 2022 16:05:22 GMT 1
New seals and the boots for the sliding pins fitted along with the err, refurbished pads 🤠. The thing is I assembled the caliper with red rubber grease. One of the slides has a seal around the end of the pin that goes into a sealed cylinder. It's so airtight it actually acts like a damper. When I push it in the air pressure pushes it back out! Not right out but I could see it putting permanent pressure on the fixed pad. I thought the air would gradually leak out but after a couple of days it's the same. Any thoughts? Not something I've come across before.
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Post by midlifecrisisrd on Aug 21, 2022 17:35:15 GMT 1
Yes seen them do that
Wasn't the bellow but the grease on the slide pin sealing it
If yours is the bellow then squeeze the slide in then break the seal on the bellow to let the air out
Steve
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Post by steve63 on Aug 21, 2022 19:07:35 GMT 1
Yes seen them do that Wasn't the bellow but the grease on the slide pin sealing it If yours is the bellow then squeeze the slide in then break the seal on the bellow to let the air out Steve I think it's air under the pin. The pin was very tight to get in past the bellow. It's like an air shock! I thought it would gradually leak out but seems exactly the same now. I might try clamping it. Putting it under a lot more pressure. The end of the pin has a seal in a groove. It seemed odd that there wasn't a replacement in the kit. Fortunately the original seemed fine so I just re-used it. The caliper looks very much like a YPVS one with two sliding pins.
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Post by JonW on Aug 27, 2022 5:02:28 GMT 1
yep all these calipers seem to do this. usually the air bleeds out.
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Post by steve63 on Aug 29, 2022 21:40:25 GMT 1
yep all these calipers seem to do this. usually the air bleeds out. I clamped it overnight with a G clamp and is still seemed the same when I took the clamp off. I stuck it in a bag and in the box with the other refurbished bits off the bike for now. The time it takes to unbolt the front mudguard and remove and refurbish the forks might be enough time for the air to bleed out. The mudguard bolts look like they might cause me trouble 😁
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Post by steve63 on Sept 29, 2022 13:15:03 GMT 1
I was distracted from the LC today by the mighty SR. The head set bearings have one of the worst notches I've ever felt but I'm not giving up the idea that the bearings can be saved. First job, remove the front end starting with the wheel, then mudguard, then forks, easy. I sprayed some release spray on the mudguard bolts months ago. I have no faith whatsoever but did it anyway. I used the hot air paint stripper and then a 12mm socket. Surprisingly it was the last but one that sheared, it's usually the last one 🤔. Fortunately about 4/5mm was sticking up so the welded nut method could be used. It really didn't want to come out and I had to wind it back and forth for quite a while before it slowly unwound fully. M8 tap through and jobs a good un. I had a thought. I wonder if I could stick an RGV caliper on it? Would you believe it......no 😀. 90mm centres for the RGV and 83?mm for the SR. Never mind. Result: head set bearings going in the bin 😃
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Post by midlifecrisisrd on Sept 29, 2022 15:06:48 GMT 1
The problem I've came up against putting bigger calipers on a spoked wheel is getting the caliper to clear the spokes
If you could find a cheap xjr400/xj6/fz6 caliper they are twin piston but both on the one side
Steve
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Post by steve63 on Sept 29, 2022 16:45:31 GMT 1
The problem I've came up against putting bigger calipers on a spoked wheel is getting the caliper to clear the spokes If you could find a cheap xjr400/xj6/fz6 caliper they are twin piston but both on the one side Steve The later SR125's had twin piston calipers. Sounds like the same ones. I think the later SR forks are different though. To be honest the standard, now that it's been refurbished, might be adequate (at best). It's just that I have two spare sets of RGV calipers so I thought I'd give it a try just in case by some miracle it fitted. The standard looks a lot like the 31K caliper. I converted a 250LC to 350, well actually I fitted Stan Stephens production tune barrels to it, but left the single disc on it. I had one or two @rse nipping moments. It wasn't really enough for 50 ish hp but one of those should be able to deal with 13hp The budget is still reeling from the shock of having to fork out for new head set bearings
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Post by steve63 on Oct 6, 2022 7:02:56 GMT 1
Stripped the forks yesterday. They weren't leaking but the action felt different between them and I wanted to see why. The lowers needed a clean up and they won't fit in the blaster whole. This is what happens when someone tries to remove a circlip without circlip pliers I'm guessing. These forks use a proper circlip rather than a 'wire' type to retain the seal. Before. One done.
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Post by JonW on Oct 30, 2022 23:21:30 GMT 1
LOL I didnt see how you could fix the head bearings without new ones so pleased to hear thats what you did.
88mm... so a ypvs caliper would fit?
You can often remove some material from the back side of the caliper to clear spokes, but dont go too far. You can also space calipers over and run the pistons further to one side as well. Ok, these are both dodges but will help with spokes. Had to do these things before with some SM setups.
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Post by steve63 on Oct 31, 2022 14:03:29 GMT 1
LOL I didnt see how you could fix the head bearings without new ones so pleased to hear thats what you did. 88mm... so a ypvs caliper would fit? You can often remove some material from the back side of the caliper to clear spokes, but dont go too far. You can also space calipers over and run the pistons further to one side as well. Ok, these are both dodges but will help with spokes. Had to do these things before with some SM setups. I was kidding myself that it might have been hardened grease and over-tightening of the bearings but there was clearly a set of indents in the races so they had to be binned. Fitted with Yambits ball races now and all seems OK. I'll have to make sure I land any big wheelies carefully rather than slamming it down hard The SR is 83mm centres I think but I've only used a tape measure so I'm not 100% sure. I have totally rebuilt the original caliper so I'll probably see how well it works. It looks exactly the same as an LC2 and the disc looks identical to a 2/350LC so in theory it should be good enough to reign in the 13 horse power and 100kg of the SR. I have less time now so some things I thought of doing might not be viable. As usual I need to focus I tried a GSXR400 back wheel on the RGV and the caliper was touching by about a mm. I ended up buying a VJ22 back wheel in the end so never had to modify the caliper.
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Post by steve63 on Feb 10, 2023 15:27:38 GMT 1
I can't believe how nervous I still get doing this. It's usually the last one that does you over but all slackened off this time around. One bearing has got rubber seals both side and the other has a metal seal on the outside and nothing in the middle, odd. New bearings/seals to order. The ones in now don't look like they would have lasted the trip.
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Post by Chewie01 on Feb 10, 2023 15:41:18 GMT 1
This brings back memories of having to spark erode the sheered off bolts out of a mate RG500 wheel years ago.
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Post by steve63 on Feb 10, 2023 21:29:50 GMT 1
This brings back memories of having to spark erode the sheered off bolts out of a mate RG500 wheel years ago. I've never had spark erroding done. Is it mega expensive? I've watched a few videos of people mig welding into broken stud holes and getting it out that way. The temptation is to stick a tube over a good quality Allen key and go for it but I held back and put a bit of heat into the wheel first with a hot air paint stripper and then went for it. It's quite a good feeling when you get a crack then it turns. Much better than a crack and it just snaps! I dropped the wheel, tube and rim tape in the big tub of citric acid. It will be de-rusted in a couple of days
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Post by pedheadfred on Feb 10, 2023 22:25:16 GMT 1
A group of loosely associated old men like me, most of whom I've never met, are planning (well have talked about in the pub & started a Face Ache page) to do the Lands end to John O'groats trip next year. Two rules apply: 1) Maximum 125cc 2) Motorcycle must be Cruiser or Custom type. Optional rule for the brave/foolish: Country of origin: China 2nd set of optional rules: pi$$ pot helmets, tassels, leather chaps etc.etc. Yamaha SR125. Already turning out to be a bit of a pussy magnet. Looks like a pussy magnet
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Post by Chewie01 on Feb 10, 2023 23:10:38 GMT 1
I'm not sure what it would cost to have it done. When I did it the company I worked for at the time had an old erroder that involved manually winding down the electrode every now and again and putting some water on it to stop it burning out. It was time consuming but one of those jobs where you could do something else at the same time. I would imagine there are machines that automate the process, making it cheaper.
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Post by steve63 on Feb 11, 2023 13:47:20 GMT 1
My new tubes have arrived. Bit of a problem though. I'm not a trained motorcycle mechanic so I'm going to have to take the wheels somewhere to have them fitted. I also don't know what the OEM specs are so I can't check that they are working in accordance with the specs. I'll just presume that if they keep the air within the tyre then we're good to go.
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Post by steve63 on Feb 11, 2023 14:27:29 GMT 1
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Post by steve63 on Feb 11, 2023 19:54:09 GMT 1
A group of loosely associated old men like me, most of whom I've never met, are planning (well have talked about in the pub & started a Face Ache page) to do the Lands end to John O'groats trip next year. Two rules apply: 1) Maximum 125cc 2) Motorcycle must be Cruiser or Custom type. Optional rule for the brave/foolish: Country of origin: China 2nd set of optional rules: pi$$ pot helmets, tassels, leather chaps etc.etc. Yamaha SR125. Already turning out to be a bit of a pussy magnet. Looks like a pussy magnet Ah, Poor old Daisy. She went to the big cat playground in the Sky a few months ago now. We have two new terrors now but they're not allowed outside yet.
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Post by steve63 on Feb 13, 2023 18:18:12 GMT 1
I bought these Triumph calipers for the F2 forks and I was reading about them being 83mm centres and thought, hang on the SR is 83 centres I wonder........ Yep it fits. I can't try the wheel and disc yet so I don't know if it will all line up and I don't know if I'm going to use it but it could be an option.
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Post by donkeychomp on Feb 13, 2023 23:28:23 GMT 1
Think that caliper will double the value of the bike!
Alex
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Post by steve63 on Feb 14, 2023 21:34:37 GMT 1
LOL I didnt see how you could fix the head bearings without new ones so pleased to hear thats what you did. 88mm... so a ypvs caliper would fit? You can often remove some material from the back side of the caliper to clear spokes, but dont go too far. You can also space calipers over and run the pistons further to one side as well. Ok, these are both dodges but will help with spokes. Had to do these things before with some SM setups. I had a look back in this thread and saw that you mentioned a YPVS caliper. I tried the F2 caliper at the weekend and I suppose it was obvious but as the Triumph caliper fits the F2 fork leg then a F2 caliper also fits the SR leg. I still had to take one to the garage and try it thought The new wheel bearings and seals arrived today but there's been a hiccup on the tyre delivery. The front wheel is in a tank of citric acid being de-rusted and the back one is in the bead blaster being de-crudded. By weekend and by some miracle I might be able to start re-assembling. I'm going to whisper this: ( I'm going to paint the spokes silver).
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Post by donkeychomp on Feb 27, 2023 22:57:49 GMT 1
Alex
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Post by lcmarky on Feb 28, 2023 10:59:02 GMT 1
Alex You can see in her face how disappointed she is that's not a 2 Stroke!!
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Post by steve63 on Feb 28, 2023 13:53:38 GMT 1
Alex That looks like it could be an entertaining ride
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Post by jackjabba on Mar 2, 2023 8:40:39 GMT 1
Did the trip ever happen?
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Post by steve63 on Mar 2, 2023 13:53:15 GMT 1
Did the trip ever happen? It's this Summer sometime. There seems to be two waves being (almost) organised, one in June and a second in July. I'm leaning towards the July one. As is usual when a group decide to do something there are differences of opinion about how and when it's going to be done. This lot is the same.
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Post by steve63 on Mar 5, 2023 18:40:04 GMT 1
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Post by tdrpete on Mar 14, 2023 15:30:27 GMT 1
I like the span adjusters on the back wheel for chain adjustment would be a nice handy addition to an Lc Swingarm. Sr is coming along nicely. Well done.
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Post by steve63 on Mar 14, 2023 21:22:13 GMT 1
I like the span adjusters on the back wheel for chain adjustment would be a nice handy addition to an Lc Swingarm. Sr is coming along nicely. Well done. Thanks. I seem to remember my Dt125MX had the snail cam chain adjusters but I might be remembering wrong. I've taken the swinger out now. I don't know how far to go with it but It's hard for me to bolt something back on that's scabby and rusty and do nothing about it. I think the back sub frames section of the frame is bent to one side so I might draw the line after painting the swinging arm and sling it back together. Then I'll see how to go about straightening it out. I'm thinking along the lines of bits of heavy gauge tube and a bottle jack . On the other hand it probably won't make any difference to anything if it's a bit lopsided
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