1999 EC250 crank spins relative to bearing race

[70455gto]

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!

 

[70455gto]

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

 

[70455gto]

https://flic.kr/p/XYTCC4.jpg

 

[70455gto]

 

[70455gto]

[/url]

 

[70455gto]

 

[70455gto]

 

[Zman]

the photo links did not work

 

[70455gto]

http://flic.kr/p/XYTCC4

Hopefully these links work. Test #13

 

[70455gto]

#14 attempt

https://www.flickr.com/photos/155104793@N07/36743419923/

 

[Zman]

I would agree you should probably keep the cranks and weights together as from the GG factory.

 

[70455gto]

Thanks zman. Swapping cranks now. Keeping weights paired with respective cranks.

 

[slocalspode]

Does the '99 engine still have the counter balancer installed?
I am guessing the different weights on the cranks is because of this.
The '02 motor does not have the balancer.
I would check into this swap further before continuing.
You might try and private message Jim Cook, he used to own Smackover
motorsports and is a guru on GG bikes.

 

[70455gto]

99 motor was bottom end only with few clutch side parts.

Both cases look identical (02 and 99). How can one identify counterbalanced vs not motor?


Evenweight = counterbalanced and uneven weight= not counterbalanced?

If I get it wrong, it vibrates like holy heck?

 

[70455gto]

[/url]99 ec250 and 02 xc250 gasgas crank weight by S NELSON, on Flickr[/IMG]

 

[70455gto]

[/url]99 and 02 gasgas cases by S NELSON, on Flickr[/IMG]

[/url]99 and 02 gasgas cases by S NELSON, on Flickr[/IMG]

[/url]99 and 02 gasgas cases by S NELSON, on Flickr[/IMG]

[/url]99 and 02 gasgas cases by S NELSON, on Flickr[/IMG]

 

[Zman]

I thought GG ended the counterbalance in 1998.

 

[slocalspode]

Here is a picture of my 98 motor with the balancer shaft.
above and to the right of the stator.It is possible that the enduro
bikes stopped using the balancer in 99. I thought it was 2000.
I think the quad bike motors used the balancer for several more years.

 

[70455gto]

Thanks slocalspode! Do you have partial or full weight installed behind crank nut and gear on clutch side of crank?

 

[Zman]

That is the magnetic flywheel that corresponds to the Ducati stator coil in the metal ignition cover. It serves dual purpose as a flywheel weight.

My 2000 does not have a counter balancer.