Author Topic: Kx 125 1999 water in crank  (Read 3074 times)

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Offline Craigo 89

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Kx 125 1999 water in crank
« on: January 20, 2019, 10:58:13 PM »
Hey guy, I have a kx 125 1999 I’m doin a ground up on it, currently in pieces, before pulling it apart I was aware of water in gear box as would use lots of water and oil would go milky so I assumed what pump seal or worm shaft upon taking motor out I notice a lot of water in exhaust chamber, further to that I noticed water in crank aswell I inspected the head gasket  and she is f**ked. Is it possible for that much water to work it’s way down to crank from just a head gasket or could it be something more sevier. Thanks guys, if you could bear with me as I’m not very mechanical savie. :-)

Offline umberto

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Re: Kx 125 1999 water in crank
« Reply #1 on: January 21, 2019, 05:31:55 AM »
Hi Craigo 89, welcome to the site.  Sounds like you've got quite a rebuild on your hands.  Did you take photos of the motor as you took it apart?  I'm curious to see how much water is in the motor.
Perhaps I have a dirt bike addiction?

03 KX 250/88 KX 525/2017 KX250F - Goliath
17 KX250F/04 KX250
04 KX 250 - Lunchbox's Bike
05 KX 125/144

Offline Foxx4Beaver

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Re: Kx 125 1999 water in crank
« Reply #2 on: January 21, 2019, 06:11:19 AM »
Is it possible for that much water to work it’s way down to crank from just a head gasket or could it be something more sevier. Thanks guys, if you could bear with me as I’m not very mechanical savie. :-)

Absolutely, if the head gasket is really that bad. Just sitting, water could seep into the crank area. You didn't mention if the water in the crank area was milky grey...if it was/is, that would indicate a bad clutch side crank seal...it's obvious the water pump seal/shaft is bad with your oil being grey.
The other possibility is you "could" have a bad magneto side crank seal...but...you would've needed to be riding in a lot of heavy wet conditions for water to get past the magneto cover and sucked through a bad crank seal. If you had/have a bad crank seal, you should also have noticed it running lean, and possibly rather hot. 
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline Craigo 89

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Re: Kx 125 1999 water in crank
« Reply #3 on: January 21, 2019, 09:09:39 AM »
Hey guy thanks, water in crank case is clean, I haven’t pulled bottom end apart as I’m trying to avoid that, the head gasket wasn’t absolutely f**ked only had one spot on it were it was broken, I’m goin to do the water pump seal and shaft if shaft is f**ked witch I assume it is, do you guys no a way for me to get water out crank case without splitting the case, take barrel of and turn upside and flush with diesel ? Thanks for your help bois :-)

Offline Craigo 89

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Re: Kx 125 1999 water in crank
« Reply #4 on: January 21, 2019, 09:13:05 AM »
Also the bottom end on bike was bit dooey when riding but then mid range and power band were fine,

Offline Foxx4Beaver

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Re: Kx 125 1999 water in crank
« Reply #5 on: January 21, 2019, 09:20:12 AM »
The only problem with just turnin it upside down and flushing it, is you won't have any idea if there's any rust damage(most likely there is), and no one knows how long water has been in there.
Unfortunately, the best way is to tear it down....unless of course, you don't have any intentions on it being a truly reliable bike. I don't mean that in a negative way...but if you're gunna do a rebuild on it, don't skimp...or you'll be tearin it apart again, sooner rather than later.
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline umberto

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Re: Kx 125 1999 water in crank
« Reply #6 on: January 21, 2019, 09:35:49 AM »
I know this is not what you were asking, but I agree with Foxx.  If you rebuild it without splitting the cases and checking the bottom end, bearings, and seals, you will be wasting your money.  Your bike is 20 years old, and unless the bottom end was redone recently it's most likely both worn out and now rusty. Even if you buy a simple Wrench Rabbit kit and rebuilt it, you would be miles ahead of trying to flush out the bottom end.

If it were mine and I was going to keep it, I would go through it and replace the bearings, seals, and transmission snap rings with OEM parts and the gaskets with OEM or Cometic.  I'd also replace the rod and piston with Wossner parts.
Perhaps I have a dirt bike addiction?

03 KX 250/88 KX 525/2017 KX250F - Goliath
17 KX250F/04 KX250
04 KX 250 - Lunchbox's Bike
05 KX 125/144

Offline Foxx4Beaver

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Re: Kx 125 1999 water in crank
« Reply #7 on: January 21, 2019, 09:38:48 AM »
A leak down test can help determine if you have a bad crank seal.....but you'll need to fix that head gasket issue first.
The head could very well be warped also...you'll need to make sure it's flat by lapping it on a very flat surface.
Same with the cylinder....remove the studs, and lapp the deck surface too.
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline Craigo 89

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Re: Kx 125 1999 water in crank
« Reply #8 on: January 21, 2019, 10:51:15 PM »
Thanks for all your help guys, use are legends, as use recommended I know it would be a good idea to tear it apart and rebuilt bottom end seals and bearings, but as I’m only a beginner in this I think that is something that I would have to get a moto mechanic to do, witch come down to price. Are the parts for a bike this old easily acceable for parts. 🤙

Offline Foxx4Beaver

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Re: Kx 125 1999 water in crank
« Reply #9 on: January 21, 2019, 10:55:16 PM »
You should be able to get everything you need rather easily...some OEM, and aftermarket parts are readily available.
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ