Scooterotica

yes

i am still do it the old way with pen paper and calculator

if its a budget 200 motor it wont bother it too much either way anyway ,, race engines have gone from divergent to convergent to parallel to venturised clearances over the years and then back again and all the software ive tried have an inherent flaw regarding msv
id just go for a safe clearance and more importantly a compression ratio suited to the motors spec

Wow.