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Difference between 2 and 4 stroke OB.
wcurling	#1  Posted on 06/07/19 - 7:48 AM
Member Posts: 3 Comments: 0 Joined: 05/03/17	I currently own a 1984 Montauk with 2002 Mercury 90 2 stroke (less than 50 hours run-time). My question is for anyone that has run both types of OB, 2 and 4 stroke of the same make and model be it a Yamaha, Mercury, Johnson etc. Are the 4 strokes that much quieter than the 2 strokes at idle and at speed? Is takeoff from dead still (hole shot), very noticeable? I think my main point of interest is the amount or reduction of noise. Any information that anyone could provide would be greatly appreciated. I am really trying to ascertain if the replacement of my 2 stroke with a 4 stroke is worth the expense. Thanks in advance for your help.
acassidy	#2  Posted on 06/07/19 - 8:20 AM
Member Personal Page Posts: 268 Comments: 1 Joined: 11/21/05	https://www.youtube.com/watch?v=xvXDB...vXDBJWvUWM
Phil T	#3  Posted on 06/07/19 - 9:13 AM
Administrator Personal Page Personal Album Project Albums Posts: 7043 Comments: 6 Joined: 03/26/05	Four strokes are wisper quiet. Hole shot is decent, a small bit slower off the line but it really doesn't matter.. As for expense, it will be a ~ $8500-9500 decision. Personally, it is not a wise decision if the Mercury is not close to death or - - You live on your boat running 150+ hrs a season. Average boater spends <50 hrs/season. - Take long high speed runs (fuel burn and droning sounds) - Have small kids and sensitive to exhaust. 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
MarkTemplar	#4  Posted on 06/07/19 - 8:13 PM
Member Posts: 30 Comments: 0 Joined: 03/06/14	Weight. 2-strokes are a fraction of the weight of a 4-stroke. less weight on boat=greater speed & capacity. 2-strokes have more hp & performance per displacement via torque at higher rpms. 2x's power of a 4-stroke. 2-strokes don't lose power due valves' operation. Cams are different. downside to 2-strokes: gotta mix oil/gas fuel. greater fuel consumption. NOISE.
wcurling	#5  Posted on 06/08/19 - 4:38 AM
Member Posts: 3 Comments: 0 Joined: 05/03/17	Thanks to each and everyone for their help on my OB questions. With my Mercury 90hp and less than 50 hours on it, it makes it hard to purchase a 4 stroke. Outside of the noise factor it appears I should probably stay with the Mercury. Hopefully I can get an opportunity to ride in a boat with a 4 stroke this summer. Thanks again fellas, very much appreciated.