There is a difference between the S4 and S5 counterweights.
Attached is a picture of the two Front counterweights that I have, and as you can see there is a visible difference in the width of the flange. Unfortunately, I cannot remember for sure which is which, but I believe that the thinner weight is from the S5 (89-92) engine. This would make sense as those rotors are 1/2 pound lighter.
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?
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?
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