I'm rebuilding 1981 gs 750 16 valve engine, and I'd like to ensure, that i'm doing it properly
![Smile](https://www.thegsresources.com/_forum/core/images/smilies/smile.png)
Original motor was wasted as You can on the picture bellow. Crankshaft was damaged and bearing pins went straight to garbage.
![](http://img710.imageshack.us/img710/7889/p1010195n.jpg)
I manage to get another engine, with a nice crank, pistons, rods etc. and decided to swap all the "insides" and good stuff into my old crankcase (engine numbers must match the frame numbers). According to service manual:
![](http://img215.imageshack.us/img215/9234/crankcrankcase.jpg)
I have to check letters on the "old" crankcase and compare it with the letters on the "new" crankshaft.
Here is the crankcase:
![](http://img856.imageshack.us/img856/232/p1010168w.jpg)
And here's the crankshaft:
![](http://img252.imageshack.us/img252/4841/crankb.jpg)
SO, crankcase is B B B B B B, while the crankshaft is B B B B B O(???). It seems i have to use "brown" crankshaft bearings 12229 45400 030 all the way, but what's with the "O" at the end of crank?? Also "brown" bearing? What are Your thoughts? Maybe check it with the plastigauge??
Another thing is the rod bearings issue. They seem to be in quite good shape, and they were orignally matched with the crankshaft shown earlier, so no problems at all. Anyway, should i replace them with the new ones,or leave it as it is?
Here they are:
![](http://img833.imageshack.us/img833/1104/p1010181k.jpg)
![](http://img515.imageshack.us/img515/3721/p1010188mt.jpg)
![](http://img703.imageshack.us/img703/3448/p1010190s.jpg)
![](http://img259.imageshack.us/img259/6936/p1010179sq.jpg)
Thanks a lot for any tips or advices.
Nicolas
![](http://http://imageshack.us/f/207/20877874931.jpg/)
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