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The 115’s are a well proven, reliable, economical and solid performer. If your boat is rated to take 140hp, the Suzuki 140 is the same displacement and weight as the 115. The 90 is less cc and lighter than the 115.
The Suzuki software is called SDS (Suzuki Diagnostic System), and can be bought along with the required cable to connect the engine to the laptop. It not only allows engine systems to be checked but it can also perform various test and diagnostic functions as well as see a full record of engine history hours, service codes and faults. Can get knockoff copies on ebay that seem to work OK.
Suzuki have released a new (to the USA) digital gauge that is very nice highly accurate and gives a heap of engine and fuel data, would be worth considering getting one or two put in when the engine is installed. We have had these gauges in Australia and the rest of the world since 2015 and they have been virtually flawless.
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All good, let me know if you need any more info. I have DF115 2010 year thats been flawless, and the A series current models use 10-15% less fuel and are quieter and smoother again.
Dont ignore the 90A, they are a very nice motor with heaps of power and are significantly lighter and smaller profile than the 115’s. So if weight/size are issues on your boat they would be well worth a look.
The Suzukis have very different rpm profiles to the etecs. The etecs dont rev as fast so you can expect to run higher rpm for the Suzukis than the etec. You need to prop the Suzukis to achieve 6000-6200rpm at WOT to get best performance and economy from them.
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