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


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Old 09-30-2017, 12:37 PM
70455gto 70455gto is offline
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Default 1999 EC250 crank spins relative to bearing race

Hello

I have a 99 EC250 bottom end I am using instead of rebuilding a 2002 bottom end that grenaded transmission gears from PO.

The 99 has radial play between the crank and bearing, clutch side.

I ink marked the crank and bearing inner race. With 5 rotations by hand, the ink marks are ~15 degrees apart.

Do I attempt to have the 99 crank welded up/plasma sprayed and machined for proper fit? Or do I put the 02 crank in 99 cases?

Who has dealt with this situation?




Thanks!


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Old 09-30-2017, 01:23 PM
70455gto 70455gto is offline
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Also, 99 model crank has a full round crank weight. 01 model crank has a 2/3rds crank weight. Is the 02 off balance requiring this off center deaign? I assume I need to keep each weight with each crank.

https://flic.kr/p/XYTCC4

Hopefully the image links, if not I will look for url/image thread. 1st image upload on flickr since photobucket ransom event.

Thanks
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Old 09-30-2017, 01:26 PM
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https://flic.kr/p/XYTCC4.jpg
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Old 09-30-2017, 01:29 PM
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[img] https://flic.kr/p/XYTCC4.jpg [/img]
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Old 09-30-2017, 01:31 PM
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[/url]
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Old 09-30-2017, 01:32 PM
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Old 09-30-2017, 01:33 PM
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Old 10-01-2017, 07:57 AM
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the photo links did not work
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Old 10-01-2017, 11:07 AM
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http://flic.kr/p/XYTCC4



Hopefully these links work. Test #13
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Old 10-01-2017, 11:10 AM
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#14 attempt

https://www.flickr.com/photos/155104...7/36743419923/



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