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Old 10-21-2013, 01:51 PM
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Default cr 250 crank case question

     

I have a question about the fitment of different year model crank cases for a cr 250. I have already read on here and found out that a 92-2001 engine will fit in a 96 bike. I have also found out that something changed in 97, so 97-2001 are different than 92-96. My question is can you put a 97-2001 left side crank case on a 92-96 engine? Will everything match?
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Old 10-21-2013, 04:05 PM
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Different part numbers for sure but they look the same in the drawings. Why do you ask? Are you planning on buying a mismatch?
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Old 10-21-2013, 04:12 PM
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I was considering it. It's hard to find a 96 cr250 left side case and I am pretty sure mine is cracked beyond repair. I have not taken it apart yet though, so I might be able to weld it back together. I was just looking for another option if it is too far gone.
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Old 10-21-2013, 05:24 PM
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Default ???????

Why not just buy a good set of cases from the same year range. That way you will know all will fit.

Paw Paw
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Old 10-21-2013, 05:38 PM
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That was another question I had. Will the guts and cylinder from a 92-96 fit (and work) in a 97-01? Or would I pretty much have to get everything new?

---------- Post added at 04:38 PM ---------- Previous post was at 04:36 PM ----------

I'm just not having a lot of luck finding the 92-96 parts that I need. I have checked ebay and am still checking. I have also checked some other places.
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Old 10-21-2013, 05:51 PM
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Quote:
My question is can you put a 97-2001 left side crank case on a 92-96 engine?
Yes. The cases will bolt together and work fine.
Quote:
Will the guts and cylinder from a 92-96 fit (and work) in a 97-01?
Most everything will swap over. There are a few improvements in the 2000 and 2001
engine: Stronger castings, better oil flow, bearings, water pump impeller, cooling, etc.
Unless you have a pretty good handle on parts swapping, your probably better off
using everything from one or the other i.e. complete 2000-01 bottom end with your
92-96 top end.

dogger

Last edited by dogger315; 10-21-2013 at 06:02 PM.
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Old 10-21-2013, 05:54 PM
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I'll take a picture of the crack tonight and see if I can post it in the morning. Like I said I may be able to weld it up, but it looks like it might be real close to some bearings or gears. I can see inside the case through the crack. It has been JB welded and that didn't do it, but the guy I bought it from said something about sticking it in the dishwasher to temper it or something. I think he meant the oven. I just wonder if he threw it in a preheated oven and that's what made it worse. Just to be clear, I have no problem buying all new parts if I HAVE to, but I would like to salvage this engine if I can.
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Old 10-21-2013, 08:11 PM
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Thank-you dogger That's what I was hoping to hear.
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Old 10-21-2013, 09:59 PM
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Quote:
Originally Posted by 1276brady View Post
said something about sticking it in the dishwasher to temper it or something. I think he meant the oven.
Lol don't be surprised with PO's. Mine spray painted the gas tank and side panels w/o removing the original seat

Get that picture up for sure
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Old 10-22-2013, 07:27 AM
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Ha ha, sounds like he was trying to do a fade job.

---------- Post added at 06:22 AM ---------- Previous post was at 04:41 AM ----------

[/IMG]

---------- Post added at 06:27 AM ---------- Previous post was at 06:22 AM ----------

Well, I guess I'm not smart enough to figure out how to get pictures on here.
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Old 10-22-2013, 01:31 PM
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Quote:
Originally Posted by 1276brady View Post
Ha ha, sounds like he was trying to do a fade job.

---------- Post added at 06:22 AM ---------- Previous post was at 04:41 AM ----------

[/IMG]

---------- Post added at 06:27 AM ---------- Previous post was at 06:22 AM ----------

Well, I guess I'm not smart enough to figure out how to get pictures on here.
I use photobucket and then link the photos from there
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Old 10-22-2013, 01:58 PM
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I've never tried to post pics anywhere before. I opened a photobucket account, but I still couldn't do it. I'll try it again though.

---------- Post added at 12:51 PM ---------- Previous post was at 12:45 PM ----------

http://i811.photobucket.com/albums/z...ps90b18425.jpg

---------- Post added at 12:56 PM ---------- Previous post was at 12:51 PM ----------

http://i811.photobucket.com/albums/z...ps806f7f64.jpg http://i811.photobucket.com/albums/z...ps3c046c95.jpg

---------- Post added at 12:58 PM ---------- Previous post was at 12:56 PM ----------

I did it!
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Old 05-18-2016, 11:48 AM
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Hi guys, this is my first time posting and this may be and this may be an old thread but I need some expert advice. I have a 93 cr250r. I had my chain snap and slapped a hole in my left case. After reading here and other forums I got the impression that I could swap my left case out with any from 92-01. I found a 01 left case online and installed it. After splitting the cases I found my main crank bearing on the left was bad so I put new one's on both sides. After reassembly the bike fired and sounded good so I took it out. After 2 hours the bike began knocking. So I took the bike to parma daves racing. He confirmed my crank was bad. Well he just texted me and said the cases are not lining up where the cylinder sits and could've cause an air leak which in turn fried my crank. Shouldn't this have worked? Is there something I can do to make it work? Help me out guys!
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Old 05-18-2016, 02:57 PM
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normally should have worked but if it is true that the cylinder surfaces are not lined up (for e.g. there is about 0,5mm difference) then it can be fixed by machining the cases cylinder surface to be flat. usually if there is an air leak it should have other problems such as high idling/rough running etc. my guess is that the crank was on its way so it should have been rebuild with a new rod/bearing.
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Old 06-14-2016, 07:44 PM
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So my case half got machined to be correct they were 5 thousands of an in difference .005. PDR rebuilt the complete engine just waiting on my head to come back, ships friday!! I should be RIPPING by next weekend !

Just a note for anyone swapping case halves use feeler gauges to make sure that your case halves are perfectly even. IF they're not you will pull in air and smoke your crank very fast.
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Old 06-15-2016, 04:19 AM
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nice, work done.

on mine my cylinder base gasket surface had to be machined by 0,02 to be perfectly flat! although it was running normal when i pulled the cylinder the base gasket was sealing only the outer perimeter/area of it! so it is good to check that area too. if the base has to be cut more than 0,01 we should consider a slightly thicker custom gasket (i've used a custom cut gasket) to keep previous C/R
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