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Discussion Starter · #1 ·
Getting ready to install a new piston in my Super sport. The piston is a Mondial 1966 which matches the old piston but I am not sure if it matters which way it goes in terms of top or bottom as there is no obvious mark? Please advise.
 

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hi at is that a 4stroke or two stroke ?
 

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i know that on a car engine theres usually an arrow to indicate which way to install it,if there is no marking on it i dont think it will matter too much.
 

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Yes, there is usually an arrow. If there is nothing, my gut feeling would to be to orientate any stamping like an oversize number towards the front of the bore.
 

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Discussion Starter · #6 ·
Thanks for the feedback... the only mark is a B but it is off to the side (not front or back). The valve reliefs are identical and by all my measures it is symmetrical so I am fairly confident at this point that it can go in either way.
 

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Discussion Starter · #8 ·
Thanks Peter... now to get it fitted into the cylinder with that troublesome oil ring below the wrist/gudgeon pin!
 
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