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I'm a cause and effect kinda guy so I want to find out what happened.
I have never seen it personally but, I have heard over-reving can cause
rods to bend. The banging on the wrist pin thing could have happened too,
not by me, the top end was 3 over.
Now that it's out, I'm not sure both of them aren't bent.
You can also see how crooked the piston was riding.

Pictures aren't working today, I'll try later.

Yes, did some research and the Harley guys have a wrist pin sized rod to check against case deck.
A guy also got 2 machinist quality beams (below or above the wrist pin) to raise or drop onto to check alignment against the case. Also, I was able to check old 250cc piston for wear marks and found a lot of blow by on one side of the piston. So, it was running before with the bent rod but seems the tolerances were larger and piston clearance was not an issue. Doubt I'll be able to straighten.

Hi. I'll start with the problem. Dropping a new top end in my '74 RD350. Left side slides right on.
Right side won't go into the case without some pressure (without rings.) When on and torqued, the right piston drags in spots. The outside bottom piston skirt was contacting the cylinder. I re-checked the bore clearance (.003.) I'm suspecting a PO over rev.
Bent fucking con rod, right? What else could it be?
Everything fits great till U put the wrist pin in.

I got it. I just gently drifted them out with the shaft from the other side.
Not sure if that's how it's done but, it worked (will be replacing both anyway.)

I am stripping my cases. Up to shift forks/guide removal.

How do you remove the plugs to get to the outside snap ring?
Is it a destroy and replace kinda thing?
'74 RD 350.
Thanks,

That's very helpful since I already bought new seals for the RD cases.
As for the bearing retainer, Yamaha must have thought it was needed for some reason.
Thanks,

So I need a set of crankcases for my '74 RD350. Found a set on the Bay and paid today.
About an hour ago the seller sent me a message stating "Dear customer, I apologize, after searching high and low for these cases we are unable to find them in our warehouse." He goes on to say that he has an R5 mostly complete engine (also selling on eBay) and he would be willing to break it down and sell me the cases.

Question, is there any advantage to using R5 cases for an RD?

The engine was put back together with all long engine studs so
6 of them are about an inch too long.
I think I already know the answer but I could be missing something.

Looking for a hydro blaster in LA county, CA.