No worries mate.
Combustion Chamber Volume = 25.4cc
1.6mm Squish band/Deck height volume = 6.52cc
Piston Dome Height = 3.3mm, Diameter 72mm, Volume estimated 6.74cc
Trapped Volume = (Combustion Chamber + Deck Height Volume) - Piston Dome Volume
= (25.4 + 6.52) - 6.74
= 25.18cc
UCCR = (Trapped + Cylinder Volume) / Trapped
= (25.18 + 293) / 25.18
= 12.64:1
In saying all this it would only take an extra couple of minutes to actually cc the complete trapped volume on the bike if you were going to pull the cylinder. If you are just doing the head you could also easily cc the chamber volume to confirm its 25.4cc.
Last edited by Jakobi; 06-05-2012 at 01:30 AM.
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