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Old 02-06-2018, 09:44 AM
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Default Another 2005 CRF250R

     

So, I found a 250R with a seized bottom end for $400. This time, the bike came with a title so I'm considering building it for myself. Problem is: These 4 strokes are so expensive to rebuild! I'd love to hear from you more experienced guys what you think of this approach:
Tear down and inspect
Make a list of parts needed (for the record: it seems the problem was that someone installed a high compression piston on an old crank. The piston seems ok, but there was brass bearing material ALL over what I was able to see inside the left side cover)
If the list is higher than $2k, I'll part it out
If the list is in the $1k range (this would most likely imply using eBay to find a few used parts. Cylinder, any missing bolts/brackets/etc.)
If all it really needs is the crank and cylinder (has a small score on the right side), then I might build it for me.
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Old 02-06-2018, 11:33 AM
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Sell the good motor parts and anything motor related, stuff a CR250 or CR500 motor into the roller. That's the best option!
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Old 02-06-2018, 12:11 PM
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Is there any fabrication involved? I'll consider dropping my 2000 CR250R motor in it
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Old 02-06-2018, 03:22 PM
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Quote:
Originally Posted by gusco View Post
Is there any fabrication involved? I'll consider dropping my 2000 CR250R motor in it
Yes- the Y needs to be relocated to clear the exhaust, new motor mounts welded in, frame rails extended or replaced to reach the relocated Y piece at a minimum. Dogger315 has a couple of great threads here detailing his builds of a beer can framed CR250 and CR500.
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Old 02-06-2018, 07:20 PM
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I have a MIG welder, but no spool gun and no TIG. I don't think I'd be able to pull off the welding
Also, I did a tear down and inspection this evening and it's looking like I'm going to part it out. The hot start was packed with silicone at the carb body and, more importantly, the cases seem to have taken some damage. The front cam chain guide sits on a u-shaped cavity behind the flywheel and that is broken. The cases also seem to have some damage from shrapnel that was tossed around by the crank webs/con rod. The good news is that the head was in great shape. The valve clearances are in spec and the cam looks great. I'm going to split the cases before making a final decision, but it's not looking too good.
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Old 02-07-2018, 07:41 AM
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Yuck, yeah sounds like a part out is the way to go. The one I had years back I got really lucky with- the crank bearings went bad but the cases, cylinder, head, etc were all in great shape. I sold the motor complete to someone for what I paid for the entire bike.
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Old 02-07-2018, 09:06 AM
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I was willing to take the risk at $400... but would've much rather have made a runner out her. I'll split the cases and report findings as soon as I get a chance. Thanks for the input, Cowboy!
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Old 02-07-2018, 07:08 PM
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‘09 or newer for crf250r
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Old 02-08-2018, 09:06 AM
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I hear you, the newer the better (usually). In my case, it's more "$500 or cheaper for non-running bike." I'm cleaning them up and flipping them to: 1. make ends meet for my family. 2. Get more experience (selling them has resulted in a few side jobs over the past year from full rebuilds, to carb jobs, to water pump seals, etc.)
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Old 02-09-2018, 07:48 AM
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Well, SOMEHOW the cases survived the carnage. They got split last night and there is some damage, but they are not cracked anywhere that I could see except a hairline crack just below the crank where there seems to be some sort of oil passage. I'll post up pics in a bit, but MAYBE this one can be salvaged?? there were quite a few divots where the cases meet that were a bit raised. I'm wondering if that can be filed down and then run the stripped cases on some sandpaper on glass to ensure a flat sealing surface. My manual also shows a brass oil orifice below the piston and these cases have an aluminum piece that protrudes 1cm or so. Anyone know if this is some sort of aftermarket part?? or maybe the cases are from a different year...

---------- Post added at 08:48 AM ---------- Previous post was at 08:42 AM ----------

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Old 02-09-2018, 02:11 PM
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Pics haven't been working for me lately... Here's the link
https://imgur.com/gallery/CYesF/
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Old 02-09-2018, 06:58 PM
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Yuck!
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Old 02-13-2018, 08:53 AM
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Been too long since I was inside one of those motors to remember what I'm looking at, but I think I'd be hesistant to reuse those cases.
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Old 02-13-2018, 10:05 AM
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I am hesitant as well. Closer inspection and a cleaning revealed there is a small chunk missing from the cavity the balancer goes through. IF I can find out if smoothing these out on a glass with sand paper is an acceptable fix then I MIGHT build it to sell with a used eBay cylinder. Otherwise, I may just sit on it for a while and build it with new cases for a keeper.
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Old 02-14-2018, 07:04 AM
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Dude I wouldnt keep an ‘05 crf250r. ‘09 or newer for that model. Everyone I know who’s had one wishes they hadn’t. It is quite universally agreed that the first generation 250r’s were plagued with problems top to bottom. Usually the top fails and takes the bottoms with it. In ‘09 they got the bugs worked out. I wouldn’t even spend money on GAS for one of those money pits. I’m not trying to just be a **** I’m just giving my .02 asked for or not. Save your money dude. Part on eBay and make some instead. I’m sure there are plenty of stubborn people out there who refuse to let this one become beer cans who will buy the parts from ya!
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Old 02-14-2018, 07:25 AM
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I hear you. From what I've read, the key was to keep the oil changed and the air filter clean. I wish I could go get an '18, but the funds are simply not there. The problem with this one seems to be that someone decided to put a high compression piston on an old hot rods crank. The bearings ate it... bad. My wife thinks I should part it too; so, that's probably what's going to happen.
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Old 02-14-2018, 08:41 AM
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Smart lady!

Paw Paw
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Old 02-14-2018, 05:05 PM
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I'd like to think so... but then again: she did marry me ��
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Old 02-25-2018, 07:43 AM
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That’s what everyone says “oil changed every two rides, air filter cleaned every ride” I’m looking at one now who claims to have wasted buckets of oil on this ‘15 WR450F. Friend purchased this oil guzzler with 200+hr piston, underspec intakes, stretched out timing chain (stretched out drive chain) no rear brake pad left and every part I pull drops pine needles, dirt chunks and leaves on my garage floor. Look as if it has never been apart.
Sure, change the oil every 3 hours. everything is fine as long as you change the oil.
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Old 03-07-2018, 09:33 AM
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Quote:
Originally Posted by wFo250 View Post
That’s what everyone says “oil changed every two rides, air filter cleaned every ride” I’m looking at one now who claims to have wasted buckets of oil on this ‘15 WR450F. Friend purchased this oil guzzler with 200+hr piston, underspec intakes, stretched out timing chain (stretched out drive chain) no rear brake pad left and every part I pull drops pine needles, dirt chunks and leaves on my garage floor. Look as if it has never been apart.
Sure, change the oil every 3 hours. everything is fine as long as you change the oil.
I'm so confused by what the intended purpose of your post is. I'll clarify my last statement: I'm NOT saying this bike was well maintained. Clearly, it was not. I am saying that I would consider rebuilding it as a keeper keeping in mind the importance of regular oil and air filter maintenance (as well as valve clearance checks).
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