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86mm
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Posted by: 400exrider720

I am trying to do a 416 motor build but dont know much. What is an 86mm piston in relation to cc and what is a 416cc in piston size? are these 2 equal?

Posted by: cdale2002

The 86mm piston is aprox. 407cc and to get it to the 416 your going to need a 87mm piston.

Posted by: 400exrider720

where can I get an 87 mm piston because I cant find one at rockymountain.com?

Posted by: Colby@C&DRacing

We sell them Je, Ross or Wiseco

Posted by: GPracer2500

85mm = 397.2cc = (stock)
86mm = 406.6cc = "406"
87mm = 416.1cc = "416"
88mm = 425.8cc = "426" (some say a new sleeve is a good idea)
89mm = 435.5cc = "440" (new sleeve required)

Posted by: cdale2002

You can get them on ebay (http://motors.search.ebay.com/400ex...sofocusZunknown) in JE, Wiseco, adn some others. This place called Ronnies Mailorder has them heres a link to the page http://www.ronniesmailorder.com/item.jsp?item=56867