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Offline azrider44

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cr125 rebuild
« on: November 09, 2012, 06:51:43 PM »
So I have been lurking on here for quite some time and I thinks its time to start getting a little more involved. I picked up an 03 cr125 for $1000 as a small project bike. To replace the crank seals do I have to split the cases?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline _X_

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cr125 rebuild
« Reply #1 on: November 09, 2012, 08:05:14 PM »
no but in order to get them to seal properly you may need the seal set tool, aka crankcase assembly tool set(part#07965-1660102or07965-1660101). someone else may have a better idea. good luck.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline azrider44

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cr125 rebuild
« Reply #2 on: November 09, 2012, 08:22:06 PM »
OK thanks. I have never messed with the bottom end on a bike before and to be honest it looks a little overwhelming
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline SachsGS

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cr125 rebuild
« Reply #3 on: November 10, 2012, 03:56:21 PM »
Crank seals usually leak for a reason - do you have play in your crank bearings?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline azrider44

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cr125 rebuild
« Reply #4 on: November 10, 2012, 09:55:51 PM »
I'm not sure I haven't taken the bike apart yet but I figured if it was an easy enough repair and didn't require splitting the cases then I would just replace them for the hell of it
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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cr125 rebuild
« Reply #5 on: November 12, 2012, 11:38:19 PM »
I'm not sure I haven't taken the bike apart yet but I figured if it was an easy enough repair and didn't require splitting the cases then I would just replace them for the hell of it

That seems a little silly, but if you're deadset on doing it, pick up an aftermarket service manual for your bike model (I recommend clymer), a case splitter and flywheel puller to split the cases. Thats about $200 worth of tools and the book. Honestly if you've got the tools and the step by step instruction manual which the clymer will have, you can't go wrong.

Crank seals usually leak for a reason - do you have play in your crank bearings?

This. Find the cause of the problem before attempting to fix the problem, unless you like wasting time and money, in which case send some my way once in a while :D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline azrider44

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cr125 rebuild
« Reply #6 on: November 13, 2012, 05:19:47 AM »
Hahaha just figured i would replace some important parts to make the bike like new again. I guess its just me being paranoid i have read quite a few threads about people having bad crank seals so thought i would just replace them before they go out!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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cr125 rebuild
« Reply #7 on: November 13, 2012, 06:23:30 AM »
Hahaha just figured i would replace some important parts to make the bike like new again. I guess its just me being paranoid i have read quite a few threads about people having bad crank seals so thought i would just replace them before they go out!

Yeah man without a doubt, can't trust people to know what they're doing. I dealt with a guy who wasn't running any oil in his gas...

Crank seals are one of those these you are RIGHT to be paranoid about. Lets say you dump your tranny oil every ten hours right? 10 hours of on AVERAGE 6000 RPM, which lets face it is being conservative on a 125. If every cycle was burning a hundredth of a millilitre of tranny oil cos of dodgey seals, you're going to have none left well before your 10 hours is up. I'll let you figure out what happens after that...

At any rate, welcome to the forum and let us know what your shopping list ends up at.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline evo550

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cr125 rebuild
« Reply #8 on: November 13, 2012, 10:34:28 AM »
Crank seals usually leak for a reason
Hmmm, yep I think your right. ;D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline dogger315

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cr125 rebuild
« Reply #9 on: March 04, 2013, 04:23:32 PM »
You're talking about a ten year old tiddler.  Unless the bike has been pampered all it's life,
the seals and a lot more need attention, and probably more if you want a reliable ride.

I always tear the engine down on any used bike regardless of what the PO says.  I've heard
and seen too many horror stories from people who didn't.  We know that all used bikes come
with at least a "new top end" - never seen one yet.  A motor tear down can save you a bunch
down the road by inspecting and/or replacing parts that are worn beyond limits or worse, parts
that are ready to fail outright tearing up other parts in the process.

If you invest in a Honda service manual and some specialty tools, you can easily bring that
motor back to like new condition, and keep it that way for a modest amount of money.

I just like to know exactly what I have before I go riding or racing, especially on a 125.

dogger
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline motoxr377

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cr125 rebuild
« Reply #10 on: March 05, 2013, 01:05:13 AM »
^^^ listen to this man ^^^

Hey Dogger, are you going to MX Rewind at Unadilla this year?  I ask because I saw that pristine CR twin-shocker you restored.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline motoxr377

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« Reply #11 on: November 20, 2012, 04:02:24 PM »
Awesome! Thanks, I'll keep you posted if I do end up doing it this Spring.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »