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Discussion Starter #1 (Edited)
Hi guys it's been a while since I last posted.
Surprisingly enough on ebay I found NOS con rod big end A-B-C bearings, washer plates and A and C pins for my 1983 CR250 crankshaft. Even found a NOS KA4 I con rod.
So I'm thinking of rebuilding my crank with these NOS parts. My big end pin is A from what the " I " stamped on the end of it tells me. So I'm guessing the bearing is A Toyo Red.
The KA4 I con rod still is too wear limit specs so shouldn't need to replace it.

My question is when my machinist presses out the A pin should it be replaced with a B pin and vice versa go to a B Toyo Blue bearing?
Another question is my 1982 spare crank has a S7 conn rod. What's the difference from the KA4 I rod?
 

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Discussion Starter #2
Here's the data on A B C
Thought my one mark pin was a A but maybe it's 2 marks together.
64261
Screenshot_20200718-101259_Chrome.jpg
 
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