Topic: Marks on crankshaft

[mazingerzeca]

Hello all.
The bike is a CB750 K7
I took the crankshaft to the machine shop to have it measured. The guy told me that one of the big end journals was scored, and yes, you could feel the marks with your nails.
The guy told me that it can be solved putting a 0,25 mm oversize shell and removing 0,25 mm from the crankshaft journal. He told me that they don't have that kind of shells for bikes.
Where can I buy oversize shells for this bike?
Thank you.

[bryanj]

You can't

[mazingerzeca]

So, how can I repair these marks? Are they unrepairable? Should I just leave them on the journal and buy new standard shells?

[754]

Actually someone posted that they are now selling some on ebay
(dont know how well made they are)

Used cranks are fairly reasonable still, and probably cheaper than grinding your old one and buying them bearings.

 I would be fairly worried aboyut WHY it did, and be carefull what oil you run.

[MCRider]

Actually someone posted that they are now selling some on ebay
(dont know how well made they are)

Used cranks are fairly reasonable still, and probably cheaper than grinding your old one and buying them bearings.

 I would be fairly worried aboyut WHY it did, and be carefull what oil you run.

I have a good used one for sale, but I think the shipping to Spain is a deal breaker. Maybe not?

[mazingerzeca]

McRider, sent you a PM

[Big Jay]

I answered your e-mail on this.

Jay

[AshimotoK0]

I posted this about the undersize shells but I am not sure how deep the nitride hardening is to allow this.

Good used cranks are mega cheap in the US but the shipping to Europe can be $150-200

http://forums.sohc4.net/index.php?topic=56890.0

[mazingerzeca]

Thanks for your help.
I have a line on a used crankshaft. The shipping costs will be high, but it will be the only way to obtain one. Difficult in Europe, specially in Spain, where this bike was not sold.

[bryanj]

If its cheaper from UK i think i have a couple in crankcases that can be split