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Old 03-02-2008, 04:17 PM   #1
Ted_Ted OP
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Cracked water Jacket

I am looking at buying a cr250 but it has a "cracked water Jacket". Can anyone explain to me what this is and how difficult it is to fix.
Thanks
Ted
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Old 03-02-2008, 04:22 PM   #2
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It means the cyl. "jug" has a crack somewhere in it. Best fix would be to simply replace the jug with another one. Overbore it while you're at it.

This is a "jug" from a RM125 for example
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Old 03-02-2008, 04:24 PM   #3
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If it is a gift it may still not be worth repairing. Could/likely needs a cylinder, complete top end, crank and rod too. depending on the condition I'd likely be parting it out. It depends on why it is cracked, water freeze crack or severe overheat, impact crack, did it seize?
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Old 03-02-2008, 04:25 PM   #4
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Quote:
Originally Posted by reconsmr
If it is a gift it may still not be worth repairing. Could/likely needs a cylinder, complete top end, crank and rod too. depending on the condition I'd likely be parting it out. It depends on why it is cracked, water freeze crack or severe overheat, impact crack, did it seize?
Yep, good point. You'd need to find out all those details as well.
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Old 03-02-2008, 06:57 PM   #5
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The only way I could think of that it would crack would be if it had water in it and froze. New cylinder's aren't that expensive - I'd snag a new cylinder and piston, fit the power valve bits and call it good (and of course check that the bottom end is in decent shape, but they are quite durable).
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Old 03-02-2008, 07:57 PM   #6
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Thanks guys. According to him it was due to freeze. Here is part of the reply e-mail what do you think?

I don't know if the aluminum can simply be welded or not. I haven't even looked in to it. Worst case, is it will need a new "top end". I don't know how much this costs. I wouldn't think more than a couple hundred if you do the work yourself. And I already have the gaskets you'll need and I think I also have a repair manual (if I can find it).

So, down where the piston connects to the crankshaft probably doesn't have to be messed with, just what's above that. The head is actually fine too (though this being a 2-stroke I'm not sure if that's the right name for it).
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Old 03-03-2008, 07:20 AM   #7
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Two strokes values (and all used bikes from what I see) are in the toilet when they are running and mint. Considering that, what year is it, what is the condition, what does it need, tires, chain/sprockets, bearings for wheels, steering head, linkage, fork and shock services all add up to big $ at the end of a rebuild. I wouldn't spend more than 1800 for a pretty cherry two stroke these days, do the math and see where it stands.
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Old 03-03-2008, 08:12 AM   #8
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It is a 1995 cr250 for $600 as is. It has new tires and that is all I know about it.
[IMG]file:///C:/DOCUME%7E1/TTEWAH%7E1/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/TTEWAH%7E1/LOCALS%7E1/Temp/moz-screenshot-1.jpg[/IMG]
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Old 03-03-2008, 08:25 AM   #9
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If that was dropped in my driveway I'd file charges against the scumb*g that left it there! Move on, you can find a running bike in better condition for less than that would cost to get moving. If you were thinking of racing it it would be a $2000 adventure minimum to make it safe, IMHO, but it would still look like a bucket of, well,,, sorry. Check into the two stroke market, the 125s are near unsellable, lowball a newer, clean big 5 125 and you'll be sitting pretty, 250s should be within about 3-500 of the 125s. I kept my 1999 RM125 that is perfect because it is worth about 1200 bucks around here. There are better buys out there. Good luck.

reconsmr screwed with this post 03-03-2008 at 02:35 PM
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Old 03-03-2008, 08:43 AM   #10
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Thanks for all your input. I think I will take your advise and look for anohter one. I will post it when I buy it.
Thanks again.
Ted
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