See full version: 115hp four-strokes and direct fuel-injection two-strokes
The OptiMax 115 uses the Orbital Combustion Process which mixes fuel pressurised to 5.7bar (80psi) with air at 6.4bar (90psi) which is then injected directly into the combustion chambers. A mix of stratified and homogenous combustion is used with the air/fuel ratios varying from 40:1 to 25:1. [links]
Recommended servicing requirements for the four-strokes are every 50 hours (100 for the BF115) with water pump impeller replacement every 100 hours. Apart from the Yamaha F115A, the first service is at 20 hours when the valve clearances should be checked. All the four-strokes have canister-type oil filters. The OptiMax 115 requires servicing every 100 hours and the E-Tec 115 every 300.
BACK-UP AND WARRANTY
All the engines listed comply with US EPA 2006 exhaust emission regulations but in addition the Honda BF115, Johnson/Suzuki DF115, Evinrude E-Tec 115 and Mercury Mariner OptiMax 115 meet California Air Resources Board (CARB) 2008 requirements. The DF115 also meets EU2005 and the E-Tec 115 EU2006 requirements, both of which take into account noise emissions. The Yamaha F115A has a two-year warranty while the Honda BF115, Suzuki DF115, Mercury Mariner F115, Evinrude E-Tec 115 and OptiMax 115 get three years of coverage.
TWO-STROKES
EVINRUDE E-TEC 115
A development of the Ficht 115 and later 115 DI, the E-Tec 115 is essentially the same engine but has the much higher fuel injection pressure of 36 to 50bar (500–700psi) of its 90hp counterpart. Also the dedicated battery charging output is now 50amp. here
FOUR-STROKES
HONDA BF115
De-rated from its 130hp counterpart, the BF115 is based on the Accord car engine and has twin counter-rotating balance shafts and sequential multipoint EFI for smooth running across its entire rev range.
Because there's no belt-driven air compressor or alternator, powerhead access is very good and components such as the fuel injectors and spark plugs are easily reached. And because it's based on the long-running carburetted Johnson 115 the saltwater corrosion resistance is excellent. [links]
Unfortunately I am still continuing to have the same issues when I water tested yesterday. When the boat is not under load it will go through the full rev range. But when they boat is under load you can hear a noticeable shaking of the engine and as soon as you hit 2,500 revs putting the throttle down there is no more power. [links]
The problem is that when the boat is under load I can only reach up to 2,500 revs. When i described what was happening to the mechanic they thought it might have been some stale / dirty fuel and that the some of the carbies may have gotten dirty. So they had a look at the carbies and cleaned only one of them as they said it was only running on 3 cylinders and i emptied the tank and re filled with fresh fuel.
I'm hoping someone can help me out to diagnose an issue I am having with my Yamaha 115hp 2 stroke outboard. I have now taken then motor into the mechanic twice and they still have not been able to resolve the issue!
I plan on taking the boat back to the mechanic tomorrow for a please explain. The labor bill is starting to get up there though and I still don't have a functioning outboard! here
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