Do you know your gasket bore dia.?
Also, it looks like your 129cc downfill puts your deck height at 1cc 'positive'.
A 4.5" cyl., .5" deep calcs out to 130cc.
I subtracted 1cc from chamber volume, took a guess at your gasket bore dia. at 4.6", and the compression calculator said 13.66 to 1.
I'm pretty sure this is correct, but it does get confusing at times! Hope this helps.
gasket bore we used was 4.560 we tried different bore sizes not much diff.....wow 13.66 thought it woulda been more.thx for the input
