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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 07-22-2020, 12:47 PM
Jim_C Jim_C is offline
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Default Crank bearing 2012ec250r

Question:

I lost sixth gear (broke in four places, bent shift fork) so I split the cases to replace the gear and fork. When I split the case the main bearing on the ignition side of the crank stayed on the crank not in the case.

My question is can I just leave it on the crank when I go to put the cases back together or do I need to remove it from the crank and place it back into the case? If I have to remove it, how would a guy go about doing that. Heat?


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Old 07-22-2020, 08:07 PM
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Gasser Nate Gasser Nate is offline
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It should be installed into the cases first so you can make sure they are fully seated and the crank is installed equidistant between the case halves. But you risk damaging the bearing by removing it off the crank. I would just install new bearings and crank seals for piece of mind.
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Old 07-24-2020, 09:48 PM
Jim_C Jim_C is offline
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How do I get the bearing off the crank?
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Old 07-25-2020, 12:34 AM
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Gasser Nate Gasser Nate is offline
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With a bearing splitter and/or a press.
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Old 07-25-2020, 12:53 AM
Doc Brown Doc Brown is offline
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As Nate said, the bearing must be installed into the cases. Now that you have split the engine is a good time to replace both main bearings.

Before installing the new ones inspect the engine cases thoroughly, especially the left one where the bearing came out. Make sure that the left bearing is fully seated and sits as tight as it should.

I once removed a bearing from the crank "russian style" using a small diamond cutting disk. It was a pain but we managed to get it off without damaging the crank.

Good luck.
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Old 08-01-2020, 11:21 PM
Jim_C Jim_C is offline
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Bearing off.
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