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Old 04-20-2012, 12:12 AM   #1
invision
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The one where I break everything

Check out this thing that followed me home yesterday
JAhan

Pretty cool huh?

Got that badboy home and unloaded it.
XNIO8l

New to me 98 YZ125. FMF pipe, Excel wheels, Oneindustries seat cover, aftermarket folding shift lever, and some other goodies. Traded my project CBR for it.

So I spent today bleeding the brakes and doing minor stuff to it, so hey, time for a test ride, right?

I managed a good 20 minutes of tearing up the front yard before it went *CRACK CRACK* then stopped. Tried to kick it over and it was seized!

I've never had a 2t before, so this is all a new thing for me.

Finally got her tore down and look what I see...


NpXFth
kVIqVh
Cd3rPh
rU3duh
CXfyWh
FgLo1h



So fellow motohouston members, where do I start with getting this thing back together, and how much is it gonna cost me?
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Old 04-20-2012, 12:40 AM   #2
Japawhat02
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sleeve, piston and rings. Check connecting rod and crank for damage. Gonna need to clean all the bits and pieces of the piston out.
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Old 04-20-2012, 12:48 AM   #3
Lokati
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http://www.ebay.com/itm/1997-2000-YZ...#ht_1429wt_886

done and done
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Old 04-20-2012, 01:27 AM   #4
invision
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Quote:
Originally Posted by Japawhat02 View Post
sleeve, piston and rings. Check connecting rod and crank for damage. Gonna need to clean all the bits and pieces of the piston out.
Is this going to be a "split the case to clean it out" deal or is there some easier way that I'm not aware of?
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Old 04-20-2012, 07:59 AM   #5
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you don't need to split cases unless there is something wrong with the crank/main bearings. best thing to do is remove the rest of the motor from the frame and fill the crankcase with gasoline, slosh, dump, repeat while turning the crank slowly to be sure there is no foreign objects in the bearings. If you are not 100% sure how to check the big end or main bearings, take the motor by a KNOWLEDGEABLE motorcycle shop (or automotive machine shop at the least). You will need to have your cylinder inspected and bored before ordering a piston. There were no pictures of the cylinder walls, so I can't tell if you need to have it welded up bore boring and plating or not. I can recommend a very good place to take (or ship if you really are in beaumont) your cylinder to for the repair/replate.
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Old 04-20-2012, 08:01 AM   #6
kdog22
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Quote:
Originally Posted by Japawhat02 View Post
sleeve, piston and rings. Check connecting rod and crank for damage. Gonna need to clean all the bits and pieces of the piston out.
Yes. OR you can browse ebay for a used cyliners. Sometimes you can get lucky and find one in good condition for cheaper than what it will cost to buy a sleeve and have it re-sleeved. That's what i did on my current yz125 project on the side.

You may even want to just bore it out and step up to a big bore 134cc kit but i'd just keep it stock to keep things easy.

Quote:
Originally Posted by Lokati View Post
Almost. There's a 99% chance that the cylinder is scarred up and needs re-sleeving with how that piston broke apart.

Quote:
Originally Posted by invision View Post
Is this going to be a "split the case to clean it out" deal or is there some easier way that I'm not aware of?
When you take the cylinder off, look around for metal chunks, particles or shavings in the crank area. You can also turn the crank and see if you feel or hear any grinding.
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fkn kdogg just started staring at me like i'm bout to jump off this bike and murder some dave c. i was thinkin ok lets see what i did to this man to make him hate me and how fast can i run
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Muhammad.........Nostradamus..........Kdog
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Old 04-20-2012, 08:02 AM   #7
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Quote:
Originally Posted by Squanto84 View Post
you don't need to split cases unless there is something wrong with the crank/main bearings. best thing to do is remove the rest of the motor from the frame and fill the crankcase with gasoline, slosh, dump, repeat while turning the crank slowly to be sure there is no foreign objects in the bearings. If you are not 100% sure how to check the big end or main bearings, take the motor by a KNOWLEDGEABLE motorcycle shop (or automotive machine shop at the least). You will need to have your cylinder inspected and bored before ordering a piston. There were no pictures of the cylinder walls, so I can't tell if you need to have it welded up bore boring and plating or not. I can recommend a very good place to take (or ship if you really are in beaumont) your cylinder to for the repair/replate.
Listen to this guy
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Old 04-20-2012, 08:07 AM   #8
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Rat Racing by skeeters motorcross track on 517 can re-nikasil your cylinder in a few days. instead of buying a new one....especially if it has been ported out. (beats sending it off) I have sent shifterkart CR 125 cylinders for repair there before.
ps. yamaha of troy used to keep the cylinders in stock too...
best regards,
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