21-03-24, 07:57 PM
I presume you mean gas flowing, Smoothing of cast rough intakes ports on the carburettor engines reduces atomisation of the fuels and can lead to unburnt fuel which then reduces power. Smoothing the exhaust ports expel the burnt fuel as fast as possible is a better option. Not worth the effort on the FZS600 as the engine is in a highish state of tune as it is. You would most likely end up with less power engine. Reprofiling the cams may be a better option but is it worth the cost for a small gain.