I measure the thickness of the weight at 1.024" on the Series 4, and 0.920" on the S5 counterweight.

 

Can anyone verify these dimensions?  Rusty? 

 

Good timing Dave.  I looked at the hanger for the S4 counterweight the other day, and couldn't find it.  Next, I looked in the junk parts box in the attic, nope.  Finally, while I was messing with the single rotor today, I noticed a pile of parts that I had out when I was building the single.  Sure enough, it was in that pile.  

 

So, attached are a couple pics.  My measurements are just a bit different from yours, but you're correct on which one is which.  I annotated the measurements and weights on the first pic.  The S4 also has an odd milled area near the hub, which is visible on the second pic.  I'm thinking these may be cast, then either drilled or milled as needed to have the correct stock balance for that series counterweight.  Just a guess though.  

 

My other dilemma is my rear counterweight - I don't know which one I have.  Assuming Mazda used a similar method to change the weight on the rear end there may be a measurable difference there as well.

 

Mine measures 0.550.  I am hoping it is for a series 5 rotor.  Anyone have one around that they can measure?

 

 

You're one your own there, because I don't have one anywhere.  It would sure be nice to be able to document the difference though.  

 

Do you have your engine off, and torn down?  I'm dying to know what you find.  

 

Rusty (single rotor stuff to follow)

 

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