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CorriganJ
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PostPosted: 05:50 - 14 Aug 2023    Post subject: Reply with quote

Easy-X wrote:
Avid readers may recall mention the next door neighbour's kid's R125 well the old fella's taken it on as a project and we've got as far as taking the engine out...

Jeez Louise, it's a lot of working stripping down a modern EFI bike. All the fasteners were either barely hand tight or welded in place by corrosion. Sheared off a few rad mount bolts - easy to drill out and replace - but the worst was the bottom engine mount bolt. We tried the usual heat + hammer the ever-living crap out of it but it wouldn't budge. We gave up and cut the ends of the bolt off Sad

The plan is to take the top end apart for scrutiny (it has near zero compression.) Hmm... while disassembling the bike we noticed a lovely high flow K&N air filter and a straight-thru exhaust Thinking I doubt it's ever been retuned so I'm guessing hole in piston.

An engine rebuild if it's practical or a second-hand replacement otherwise. After that I'd say stock air filter + stock exhaust otherwise it'll just blow itself up again.


Just curious, why would an air filter and an exhaust blow a hole in the piston? Too much air flow meaning there is too much compression in the cyclinder and it damages things? I would have assumed that a 125 was so under-stressed that you could do almost anything to it and still have an engine that was... well, understressed?
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Nobby the Bastard
Harley Gaydar



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PostPosted: 06:57 - 14 Aug 2023    Post subject: Reply with quote

Mixture being far too lean = too hot = piston melting.
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Easy-X
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PostPosted: 07:56 - 14 Aug 2023    Post subject: Reply with quote

^^ Wot 'e said Smile

On top of that you have an engine most likely run with insufficient coolant and/or oil and ragged to hell and back.

It's a sorry looking thing. If I saw a fleck of rust on my chain I'd feel very guilty, give it a clean and re-oil. This 125 the whole chain is a brighter shade of orange than David Dickinson Shocked Oh! the wilful ignorance of youth Sad
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A100man
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PostPosted: 10:34 - 14 Aug 2023    Post subject: Reply with quote

Easy-X wrote:
Hmm... while disassembling the bike we noticed a lovely high flow K&N air filter and a straight-thru exhaust Thinking I doubt it's ever been retuned so I'm guessing hole in piston.


If it's a 4T I'll go for burnt exhaust valve, in this sweepstake, if the compression has gone.
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Pete.
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PostPosted: 11:07 - 14 Aug 2023    Post subject: Reply with quote

Easy-X wrote:
Avid readers may recall mention the next door neighbour's kid's R125 well the old fella's taken it on as a project and we've got as far as taking the engine out...

Jeez Louise, it's a lot of working stripping down a modern EFI bike. All the fasteners were either barely hand tight or welded in place by corrosion. Sheared off a few rad mount bolts - easy to drill out and replace - but the worst was the bottom engine mount bolt. We tried the usual heat + hammer the ever-living crap out of it but it wouldn't budge. We gave up and cut the ends of the bolt off Sad

The plan is to take the top end apart for scrutiny (it has near zero compression.) Hmm... while disassembling the bike we noticed a lovely high flow K&N air filter and a straight-thru exhaust Thinking I doubt it's ever been retuned so I'm guessing hole in piston.

An engine rebuild if it's practical or a second-hand replacement otherwise. After that I'd say stock air filter + stock exhaust otherwise it'll just blow itself up again.


The R125 has poxy weak pistons anyway...
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Bhud
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PostPosted: 17:47 - 15 Aug 2023    Post subject: Reply with quote

I just started my rebuilt engine (every nut and bolt came apart) and it works! Very Happy

I don't know why, but I had my doubts. Still have to torque up the bolts to the frame, put the brake lever and front footpegs back on, and a couple of other bits and pieces.
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to v or not to v
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PostPosted: 18:36 - 15 Aug 2023    Post subject: Reply with quote

put fluid back into clutch system after rebuilding the cylinders. then the sky came over dark as i was getting ready to take it out and test it Sad
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Kawasaki Jimbo
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PostPosted: 18:42 - 15 Aug 2023    Post subject: Reply with quote

to v or not to v wrote:
put fluid back into clutch system after rebuilding the cylinders. then the sky came over dark as i was getting ready to take it out and test it Sad


It’s a portent of doom, the gods have spoken. Better do it again.
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recman
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PostPosted: 17:02 - 16 Aug 2023    Post subject: Reply with quote

Ordered a new battery.
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ThatDippyTwat
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PostPosted: 17:13 - 16 Aug 2023    Post subject: Reply with quote

Sorted the fail list for the Crosrunner after the last MOT. It's been stood for 3 years.

Fork seal, Brakes (Binding and juddery), and taillight.

Passed without any advisories.
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stinkwheel
Bovine Proctologist



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PostPosted: 16:42 - 17 Aug 2023    Post subject: Reply with quote

Learned to silver solder then attached tags to a slip-joint for my high level end can on the VFR750. Because exhaust springs make motorbikes go faster. Should really be TIGed on but I don't have TIG and it's not getting rediculously hot this far down the system.

https://lh3.googleusercontent.com/pw/AIL4fc-dPTgyQMkYToQvLVRCO0PwTgqW-bBckzAK_iHV2taAL3fAhEFujdrUNooEeEyV8B699G5In-kiqHVmBqXRmsQK8r0OQdKTsixL7pVZqXpMc2-2vS77nEjv6r-kC0JhSV4pMq-peM6PXwwh1UrUko4I=w489-h870-s-no


Also located the source of the rumbling noise on the Enfield Bullet.
https://lh3.googleusercontent.com/pw/AIL4fc-7YMHZJhQlHFo6YKyIzSSAYBmgnCxpe1IzHakhKwarlgPWgrjvjO7j6MY_c6EACU-YiRwn0thX2JQgK2w_zltfgHIo8MVHxJ3HmaDWN-SOGCB2Tb0nsMVyX01QfXmHK5wT6mIbvRnZAcoCjuWbX77D=w1547-h870-s-no

https://lh3.googleusercontent.com/pw/AIL4fc_CoGayMdDIJR4PCoWBUfSj1xRX8cl-FBTevykOxg-j_rTGbNaxMmXld5eHa9i-2h3oQPqzJjsGVZwuvlDIBB-CiLkGcH7q3zIp-T72kALT1Kj6mbch_qcXWrEsoYB5_FZxVUQ-1RpG93Te1sPuW5dh=w1547-h870-s-no

No sign of the whereabouts of the other balls despite both outer dust seals being firmly in place. I presume they must have completely fragged.
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A100man
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PostPosted: 17:10 - 17 Aug 2023    Post subject: Reply with quote

stinkwheel wrote:


https://lh3.googleusercontent.com/pw/AIL4fc_CoGayMdDIJR4PCoWBUfSj1xRX8cl-FBTevykOxg-j_rTGbNaxMmXld5eHa9i-2h3oQPqzJjsGVZwuvlDIBB-CiLkGcH7q3zIp-T72kALT1Kj6mbch_qcXWrEsoYB5_FZxVUQ-1RpG93Te1sPuW5dh=w1547-h870-s-no

No sign of the whereabouts of the other balls despite both outer dust seals being firmly in place. I presume they must have completely fragged.


Shocked Indian Balls?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 17:39 - 17 Aug 2023    Post subject: Reply with quote

A100man wrote:

Shocked Indian Balls?


SKF from simply bearings. Done about 6,000 miles on them.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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ZebraDriver
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PostPosted: 18:09 - 17 Aug 2023    Post subject: Reply with quote

The balls are probably all there - count the number of spaces in the cage.
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RhynoCZ
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PostPosted: 18:24 - 17 Aug 2023    Post subject: Reply with quote

stinkwheel wrote:
A100man wrote:

Shocked Indian Balls?

SKF

So, Swedish ''meat'' balls, then. Thinking
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Nobby the Bastard
Harley Gaydar



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PostPosted: 18:31 - 17 Aug 2023    Post subject: Reply with quote

ZebraDriver wrote:
The balls are probably all there - count the number of spaces in the cage.


Seems you are right.
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hellkat
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PostPosted: 20:51 - 17 Aug 2023    Post subject: Reply with quote

I discussed the Suzuki with its mechanic and apparently he thinks it needs to have the stator replaced.

But it might be something else.
Rolling Eyes
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Nobby the Bastard
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PostPosted: 20:54 - 17 Aug 2023    Post subject: Reply with quote

What is it doing, or not doing?
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hellkat
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PostPosted: 21:37 - 17 Aug 2023    Post subject: Reply with quote

When the engine is running, the battery is draining. When it stops running, the battery starts to recharge again.

But two out of three (somethings ... ?voltages?) are very low (3 and 4) whereas the third is 12(v, I think)

That's what [I think] he explained to me Rolling Eyes

Might be a bit of wiring, or the reg-rec but he's starting with replacing the stator and see where that takes us.

Meh.
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Pete.
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PostPosted: 05:48 - 18 Aug 2023    Post subject: Reply with quote

hellkat wrote:
When the engine is running, the battery is draining. When it stops running, the battery starts to recharge again.

But two out of three (somethings ... ?voltages?) are very low (3 and 4) whereas the third is 12(v, I think)

That's what [I think] he explained to me Rolling Eyes

Might be a bit of wiring, or the reg-rec but he's starting with replacing the stator and see where that takes us.

Meh.


It's a Suzuki GSX - it;ll be the reg/rec. They are well known for it.

The stator is easy to check, all three phases should be putting out the same about 60-70volts AC at 5k revs.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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hellkat
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PostPosted: 15:06 - 18 Aug 2023    Post subject: Reply with quote

That is the point: he checked them and they were not.

Anyway, he just called and said its now charging, so he's gonna give it a full service as a baseline, and then put it through an MOT - so that we both have a general idea of its condition going forward.

I am happy with this situation.
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grr666
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PostPosted: 16:55 - 18 Aug 2023    Post subject: Reply with quote

That definitely would have gone pop on the way over to or back from me. Glad you took the train.
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hellkat
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PostPosted: 17:23 - 18 Aug 2023    Post subject: Reply with quote

grr666 wrote:
That definitely would have gone pop on the way over to or back from me. Glad you took the train.

Yeah but the actual act of having to be recovered would make me have to address the issue, so wherever I would have got recovered from, it's just a final reminder to pull me finger out me arse and get it sorted Laughing
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to v or not to v
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PostPosted: 19:12 - 18 Aug 2023    Post subject: Reply with quote

i remember the regulator/rectifier went on my gsx550. replaced it with a Honda one.
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hellkat
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PostPosted: 12:25 - 19 Aug 2023    Post subject: Reply with quote

Well I picked the Suzuki up, chatted with a few old coots whilst waiting for the MOT, nothing remotely marriageworthy, although their guy that does Harleys is a Kiwi (!) so I had a bit of a nag with him, but he's going home soon Rolling Eyes ...

Anyway its so sunny I am tempted to go straight back out for a ride. Thinking

The old unworthy stator (which was returned to me) was all black and grim-looking, the mechanic says its *supposed* to be a sort of goldish colour. At least now I know what one looks like Rolling Eyes

What do you guys do with old parts when you get given them back by the garage?
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