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Piston weight question


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OK so I was about to order some pistons for my bike and was going to go with the prox pistons like I always do and have been for years never had a problem.

 

But I had a set of wiecos on my bench and I compared the weight I don't have a scale but I used the feeling method it felt like 1 prox piston is almost as heavy as 2 wiescos.

 

How much would this affect power? I'm no motor expert but something tells me heavier piston means more power required to turn it. I doubt it will be a big difference but possible 1-2 hp.

 

Any thoughts?

 

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Wouldn't something like that effect the balance of an engine? I always thought they made pistons to match the crankshaft weight( of the :"lobe")

You can have the pistons balanced to the rotating assembly but most people don't bother.
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