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400exrider720
12-05-2006, 02:57 PM
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?
cdale2002
12-05-2006, 03:15 PM
The 86mm piston is aprox. 407cc and to get it to the 416 your going to need a 87mm piston.
400exrider720
12-05-2006, 03:17 PM
where can I get an 87 mm piston because I cant find one at rockymountain.com?
Colby@C&DRacing
12-05-2006, 03:23 PM
We sell them Je, Ross or Wiseco
GPracer2500
12-05-2006, 03:26 PM
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)
cdale2002
12-05-2006, 03:38 PM
You can get them on ebay (http://motors.search.ebay.com/400ex-piston_ATV-Parts_W0QQcatrefZC6QQfcclZ1QQfclZ3QQfposZ53128QQfr omZR10QQfrppZ50QQfsooZ2QQfsopZ2QQftrtZ1QQftrvZ1QQs acatZ43962QQsadisZ200QQsargnZQ2d1QQsaslcZ2QQsbrfto gZ1QQsofocusZunknown) 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