Aero piston, ID?

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Wheelman-111
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Post by Wheelman-111 »

Greetings:

Stock bore for an Aero is 41mm nominal. (40.995 or somesuch - it's in the Service Manual). SA16 Elites used a longer stroke and smaller bore to get the same 49cc displacement, but I remember reading that stock was smaller than 40, like maybe 39mm?
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bradthreee
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Post by bradthreee »

oversized piston will have .25 or .50 stamped on the top i beleive
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chevyguyjay
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Post by chevyguyjay »

almost looks like a 84-85 spree piston. :roll:
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noiseguy
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Post by noiseguy »

Spree pistons are 41mm. 10mm wristpins means it's an early design, Dio's have 12mm wristpin.

My bet is an early 83/84 Aero or Express. Both use 40mm piston and 10mm pin.
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