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Author Topic:   Mercury 90-HP Four-stroke EFI
whalerdude posted 02-20-2005 06:26 PM ET (US)   Profile for whalerdude   Send Email to whalerdude  
I was just at the Miami Boat show. and I went to the Merc display to ask if the new 90-HP four-stroke EFI was there. They were proud to show me the 2006 90-HP four-stroke EFI that will be available in May 2005. This is great news for anyone thinking of ordering a new Montauk. I have been thinking of ordering either a Dauntless 16 or a 170 Montauk and was disappointed about having to settle for a carburetor 90-HP four-stroke if I went with the Montauk. Now I don't have to settle for less.
TexasWhaler posted 02-21-2005 12:53 PM ET (US)     Profile for TexasWhaler  Send Email to TexasWhaler     
Is the 90-HP OptiMax still an option on the Boston Whaler 170 MONTAUK?
whalerdude posted 02-21-2005 01:25 PM ET (US)     Profile for whalerdude  Send Email to whalerdude     
I am not sure. I only spoke to the Mercury people and not Whaler people about the new four-stroke 90-HP EFI becoming available in May to replace the carburetor version. I would think that it would replace the OptiMax option.
jimh posted 02-24-2005 08:44 AM ET (US)     Profile for jimh  Send Email to jimh     
That is interesting news about the conversion of the Mercury 90-HP four-stroke to electronic fuel injection. The power head for that engine is manufactured by Yamaha and sent to the US for dressing and completion by Mercury. I wonder if the EFI components will be supplied by Yamaha, as they sell this same engine with EFI now, currently available in their 2005 model year line.

The purchase and delivery of these four-stroke engine power heads generated a lot of contention and legal wrangling between Mercury and Yamaha, resulting in law suits and court orders. You get the impression that Yamaha is not particularly happy to be doing business with Mercury these days, providing them with this mid-range engine in one of the most popular spots in the outboard market. The 90-HP engine is probably close to the "average" horsepower engine sold, and it must account for a lot of sales.

The contract that provides for Yamaha to sell these engines to Mercury is supposed to run through 2006, and after that I believe Yamaha has said publicly they would not deliver any more. If that is true, it looks like Mercury has gone to some engineering to get this 90-HP set up for fuel-injection, and the product life may only be one year.

One reason why I am speculating about the EFI components is from Yamaha's point of view it might be easier to just make the EFI engine and sell it to Mercury, rather than to continue to make a special version for them without the EFI. When someone gets one of these 2006 Mercury engines, I would be curious to know if the fuel injectors are the same as the ones on the 2005 Yamaha engine, or if Mercury went to the trouble to engineer their own for a product that only has a one-year life span ahead of it.

Moe posted 02-24-2005 09:23 AM ET (US)     Profile for Moe  Send Email to Moe     
The 115 and 225 EFI Mercury four-strokes supplied by Yamaha are not SmartCraft capable and only available with analog gauges. That will be one clue as to who's making the 90 EFI once it debuts.


SteveFC posted 02-24-2005 01:46 PM ET (US)     Profile for SteveFC  Send Email to SteveFC     
I mentioned in a different topic that I was also told by a reliable source that the Mercury/Yamaha contract runs through 2006. So the 90 four stroke will have a Yamaha powerhead until the divorce becomes final. My source said that the 2007 Mercury replacement will be a three cylinder Verado, which is well into development.
nydealer posted 02-25-2005 10:48 PM ET (US)     Profile for nydealer  Send Email to nydealer     
The 90 Opti is not available on the 170 montauk. Whaler has stopped shipping that engine. I'm not sure of the reason.
LHG posted 02-25-2005 11:16 PM ET (US)     Profile for LHG    
NY - But I sure would like to know why. I think they expected it would be a hotter performer than the 90 4-stroke, but evidently it's not. Still a nice, quiet engine from what I can tell. Have not heard about any problems with them yet.

Maybe now that the 90 2-stroke is being phased out, the fastest engine for the boat, they will up the HP rating to 115 to accomodate the slower clean engines?

erik selis posted 02-26-2005 04:10 AM ET (US)     Profile for erik selis  Send Email to erik selis     
I'm pleased to hear that the 90-hp Mercury 4-stroke will finally be available in the EFI version. I must also admit that it comes as a complete surprise because nobody, this side of the Atlantic, knows anything about it. I just recently asked information about it at the Belgian Boat show and not one Mercury rep. knew anything about it....

Well maybe I'm not so surprised after all. Yamaha is not introducing its new 75 and 90-hp EFI four-strokes here either. They're only available in North-America. They do however have a new 80 and 100-hp EFI. I wonder if these are the same engines with different power ratings.


BlackMax posted 02-27-2005 07:34 PM ET (US)     Profile for BlackMax    
The 80 and 100 Hp EFI ratings allow Yamaha to get more money from the sale of 75 and 90 HP engines over there. That allows them to sell these engines cheaper in the US. Nice, huh? They tried it here, too.

Mercury announced last summer that the 75 and 90 Mercury 4-strokes would have EFI for 2005, but I think Yamaha queered them on the deal because of the dissagreements over powerhead pricing and the dumping charges. They need to get the EFI Verado based 75-115's out and get rid of Yamaha ASAP.

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