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Old 06-04-2012, 04:34 PM   #1
Bloodweiser OP
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Joined: Sep 2007
Location: way over yonder in the minor key
Oddometer: 2,618
RD400 Pistons - WTF

So after concentrating on my bottom end which has been like forever,
I finally broke out dial gauge and crap to figure out what to do about my pistons.
1 looks great, 1 had a seizure at some point but was free when I got it.

Anyhow, I can't believe it took me so long to notice this:

I've got 2 different pistons!
And different sizes to boot!

The one on the left measures 2.545ish, which an estimate on that thousandths digit. It has 383 stamped on the inside wrist pin boss.

The one on the right measures 2.55 dead. Numbered 458 on the inside wrist pin boss. (I think anyway, that 4 is a little sloppy).

I'm thrown off on several fronts.
The difference between the 2 is not .25mm which relates to available piston sizes, but almost half of that. WTF?
Is/was this common practice to just bore 1 cyl? Is that even what happened?

I mean, I reckon to get a set of 65.00mm pistons and bore them both just so they match.
Would still like to hear if anyone has a clue what's going on here
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