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Any one gone down rabbit hole of trying to squeeze power out of a 99 merc 120hp in-line 4 cyl 2stroke. Well I’m trying and looking for others input and advice. So here it goes Is there a way to gain from porting exhaust ports? Like adding 3 inch to exhaust an adding 3 inch worth of individual...
Great read. I have 1999 merc sportjet 120hp in-line 4 cyl 2stroke. Is there a way to gain from porting exhaust ports? Like adding 3 inch to exhaust am adding 3 inch worth of individual diverters or something. I run jet boat so I’m not restrained by an outboard hood. Also what about 2 oval ports...
Great read. I had cpl question. Is there a way to port exhaust ports an gain power. Like adding 2-3 inches to exhaust manifold with 2-3 inch individual diverters? Also need two new carbs was thinking of going with newer flat slides like off a newer 450-500cc wheeler. Any ideas? Recommendations...
Sport jet 120hp
Hi everyone I’m currently pulling my engine out my 1999 sport jet boat with a merc 120hp. I’m looking for info on what I can port and wat I can’t port. I’ve seen cpl forums say I can’t port the exhaust ports seeing it’s a120hp 4cyl. I was planning on boring .040 over an new...
