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Author Topic:   Yamaha F100 4 stroke
basbary posted 07-20-2005 03:22 PM ET (US)   Profile for basbary   Send Email to basbary  
I finally bought my first Boston Whaler after several other boats. I am from the Netherlands and it's quite hard to find an 18" Outrage "Classic with teak gunwales" here at the right price.. But it worked.

Now my question.: I got a really good offer for a Yamaha 4 stroke engine from the F series but, it is only 100HP.
Does anybody knows how the Boston and a 100HP engine go together.. is it maybe underpowerd? Now it has a 150HP Mercury black max 2-stoke engine behind it.. very fast.. but it consumes massives amounts of fuel...

Some info would be helpfull..

Thanks in advance,


erik selis posted 07-20-2005 03:57 PM ET (US)     Profile for erik selis  Send Email to erik selis     
Welcome Bas,

I don't believe the Yamaha F100, 4-stroke is available in the USA. It is basically the same engine as the F80 (in Europe) and the F90 in the USA. I'm not sure but I also doubt if it's available with a 25-inch shaft, which you will need for your Outrage.

Forum member "elaelap", Tony, Has a Yamaha F115, 4-stroke on his really nice 18-ft Outrage. He is very pleased with this combination. This engine would be much better suited for your Outrage. I personally think the F100 would be a bit on the light side.


basbary posted 07-21-2005 02:19 PM ET (US)     Profile for basbary  Send Email to basbary     
I found out that the Yamaha F100 is indeed under powered.
and only has a 20 inch shaft.

Now I am looking to buy the F115 or the F150 the weight difference between the 2 is only 22 kg's and for the F150 you get 45 HP more but, the price difference is more than € 4000.- and I can't find second hand F150 as they are still so new.... Big dillema... anybody whith some expierence with these the 115 or 150 engine.. could maybe advise me what's best maybe the 115 is sufficient
I have read all test between various 4 stroke engines and the Yamaha's did best on speed, sound and fuel economy.

Please advise

erik selis posted 07-22-2005 01:53 AM ET (US)     Profile for erik selis  Send Email to erik selis     
As Tony "elaelap" has not been available to respond yet you can try to do a search here in the forum for his posts about his 115-hp, 4-stroke Yamaha on his 18-ft Outrage.

Here is what I found:

You will also find these threads to make for some fun reading.:-)

Hope this helps.


rjgorion posted 07-22-2005 08:33 PM ET (US)     Profile for rjgorion  Send Email to rjgorion     


I have a 1984 Outrage 18 and I repowered with a 2004 Yamaha F 150. The performance of this combination is awesome and there is more than enough power and torque to do anything you might want to do. Also the static trim is not adversely affected. I did move my 2 batteries up under the console, which helps. Also, the fuel consumption is moderate, all things condidered. It is only my opinion but Judging from what I have experienced, you would not be at all unhappy with the Yamaha. Good luck with which ever engine you choose. I would be happy to answer any questions you might have about the Yamaha. Thanks,


basbary posted 08-24-2005 06:38 AM ET (US)     Profile for basbary  Send Email to basbary     
Thank's for your reply's..
After doing some research and some testing with various engines I decided to buy the Yamaha 150HP. it is actually more than 150 HP.. This engine is so quite, no smoke.. and most importend very fuel economical.. don't forget what you pay extra for 5 liters of 2-stroke oil..
I sold my Mercury 150HP engine at a reasonable price. It was a Black max engine which consumed loads of fuel and oil allthough it was a very fast engine, the new 150 HP is almost just as fast and I will save upto an unbelievable 50 to 60% of fuel beside the oil I dont have to buy anymore! Get your calculaters out boys!
When my boat is ready I will post some pictures!!

Thanks to all for all the great info I can find on this site reagrding Boston Whalers!

LHG posted 08-24-2005 02:37 PM ET (US)     Profile for LHG    
Here again we are reading how much people like the new 4-stroke outboards, which are now starting to achieve performance comparable in most cases to the 2-strokes.

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