crankshaft

I'm fixing up an '81 engine and there is scoring on the big end of the connecting rod. Does anybody know/have a source for the big end bore diameter for the conn rod? Since the Haynes manual only has the small end bore diameter and I have not been able to find this spec elsewhere.

Hey all! I've recently started an engine rebuild here and I have a Seca engine as well as a Maxim engine. My plan is to use the best bits out of both engines. I've checked part numbers and it seems that the crankcase, head, cylinder, valves, camshafts and most other internals are all matching...

I have a big problem, i need to rectify the crankshaft but i don´t have thestandar measure of the arm from the crankshaft would you help me please? this link is a picture from i need to fix my bike :confused::confused::confused: I want to get mi bike :bike:

So I fired up my '81 xs400 last week with no problem. But when I took it for a ride there was this knocking sound comming from deep in the engine, loud too. So yesterday I tore my top end off to find the problem, looks like I got a messed up connecting rod bearing on the right side. After...