Port duration is simply amount in degrees that Port opens and

85x2=170 ex 62x2=124. 85-62=23 bld. I miss spoke on the vid

[@colorizedenhanced-silentmo5018]

Good morning, Brian david amos. Motorized bicycle info Dave amos. exceptionally important video. thanks. :)

[@2strokecarbtuningportingin187]

Glad to help

[@TheFabricatingNeanderthal]

Beautifully said

[@2strokecarbtuningportingin187]

Thanks

[@bikelifemiami3055]

Thanks

[@2strokecarbtuningportingin187]

Fur sure

[@cuppie2112]

Helping

[@2strokecarbtuningportingin187]

Thank you

[@bikelifemiami3055]

Beautiful port work. I’m getting a 50mm cylinder for my bike what should I do for my head

[@2strokecarbtuningportingin187]

If you want it to be proper you would machine the chamber size as bore