04 RM250 cylinder stress cracks ?

Stevemoto1
Edited Date/Time 12/22/2013 7:46pm
Has anyone seen this? Any idea of the cause, how to fix ? The bike started to run lean last week, found these cracks on both sides of the cylinder in about the same area. Thanks


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Berni
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Berni 12/22/2013 1:02pm
12/22/2013 1:02pm
Dont know how to repair but i know some factory teams modiffy the tie tbetween the frame and the cilynder head because the steel frame flexes and causes the head to crack. I could be the same cause
pete24
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pete24 12/22/2013 1:11pm
12/22/2013 1:11pm
call millineum and buy a cylinder and throw that one away
Bytor
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Bytor 12/22/2013 1:25pm
12/22/2013 1:25pm
Not sure who assembled it, but not torquing bolts down right could have been a cause. When was the last top end done?
malachi177
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malachi177 12/22/2013 2:39pm
12/22/2013 2:39pm
WowBlink ...never seen that before. That is very odd, I'd toss it and get a different one like the other member suggested.

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JM485
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JM485 12/22/2013 3:39pm
12/22/2013 3:39pm
Definitely use a torque wrench when you assemble the top end. If you did use one, then I don't know what would cause that, weird.
Racer92
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Racer92 12/22/2013 3:53pm
12/22/2013 3:53pm
Did it freeze with plain water in it ?
dboivin
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dboivin 12/22/2013 4:29pm
12/22/2013 4:29pm
i've seen it before with a cr250. guy had ti welded and kept on using it for a long time. I personally would just get a new cylinder.
DownSouth
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DownSouth 12/22/2013 4:49pm
12/22/2013 4:49pm
A dab of JB weld and that will be good as new. Wink
slipdog
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slipdog 12/22/2013 5:06pm
12/22/2013 5:06pm
Racer92 wrote:
Did it freeze with plain water in it ?
I was thinking the same think. I thought maybe I was just a kook...
mx5471
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mx5471 12/22/2013 5:17pm
12/22/2013 5:17pm
I could buy the freeze factor, even being that you're in Georgia. It can get cold here at night. But I highly doubt the torque is the problem. I've worked on these Rm's for 12 years and never used a torque wrench for cylinders or jugs. There is something else happening.
silver753
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silver753 12/22/2013 7:46pm
12/22/2013 7:46pm
Berni wrote:
Dont know how to repair but i know some factory teams modiffy the tie tbetween the frame and the cilynder head because the steel frame flexes...
Dont know how to repair but i know some factory teams modiffy the tie tbetween the frame and the cilynder head because the steel frame flexes and causes the head to crack. I could be the same cause
Winner winner, chicken dinner.

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