honda310r Posted May 4, 2010 Report Share Posted May 4, 2010 Ok so im building a 421cc cub with a 4mm and am wondering what size if domes should i run. The head i got has 18cc done in it already. Ill be Trail riding and also Duneing. Is the 18cc gonna give me to much compression? and i do run 50/50 mix of 91octane and 110 octane race fuel. thanks guys Quote Link to comment Share on other sites More sharing options...
firebanshee Posted May 4, 2010 Report Share Posted May 4, 2010 I think the 18cc will give you to much compression.A 21cc dome at sea level would give you about 180 with that set up.I would not go smaller than a 20cc. Quote Link to comment Share on other sites More sharing options...
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