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90 4 stk Fuel Consumption 17 montauk
rkmnoles	#1  Posted on 02/20/12 - 5:03 PM
Member Posts: 26 Comments: 0 Joined: 04/13/10	I have completed the engine change on my 83 17 ft montauk with a Yamaha 90 hp 4 stk. Can anyone that has this set up give me an approx. fuel consumption rate in MPG. I am looking at putting a 15 gal tank in it and I am just curious. Thanks, Kevin 1996 Dauntless 17 DC - 115 Johnson Ocean Runner
Joe Kriz	#2  Posted on 02/20/12 - 5:08 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	I think you might be dreaming here with any kind of 90 HP.... I would put two 12 gallon tanks just like original. If you don't want to fill one up, then you have that option.
bmw90w	#3  Posted on 02/20/12 - 7:52 PM
Member Personal Page Posts: 328 Comments: 1 Joined: 09/08/09	+ 1 1984 Montauk
Guts	#4  Posted on 02/21/12 - 4:54 AM
Member Personal Page Posts: 612 Comments: 8 Joined: 11/21/08	I think it depends on a lot of factors. Whether you're just trolling or waterskiing. How many hours you are the running the boat and at what speed. I use a 24 gallon tank. Guts/AKA/Kim
tedious	#5  Posted on 02/21/12 - 4:59 AM
Member Personal Page Posts: 1072 Comments: 2 Joined: 09/07/08	Kevin, you can get some idea of mileage from Yamaha's performance bulletins. From looking at a few of them on boats that are fairly similar in weight to your Montauk, I'd guess you're going to get 9 MPG at troll, 6 MPG at cruise, and about 4 MPG at WOT. If you're replacing a 2-stroke, the mileage at troll should be a ton better, the cruise somewhat better, and the WOT just a little better. Whether you can cut your fuel storage almost in half will depend on how much time you spend in each of those modes, but I agree with the others; get the 26 gallon that's made for the Montauk! You may not need to fill it all the time, but why not give yourself that option? Tim
rkmnoles	#6  Posted on 02/22/12 - 7:23 PM
Member Posts: 26 Comments: 0 Joined: 04/13/10	Thanks for the input. I was thinking the 15 gal. may ease the weight difference between the 2stk and the 4 stk. I fish mostly within 10 miles of fuel and I am more of a cruiser than a WOT guy. 1996 Dauntless 17 DC - 115 Johnson Ocean Runner
Karlow	#7  Posted on 02/22/12 - 8:06 PM
Member Personal Page Posts: 192 Comments: 0 Joined: 07/20/10	I have a little feed back from my 17 with the DF70. I trolled at 1.6-2.2 knots (troll brake) for 6 hours last Sat. I previous spent about 4 hour trolling and a little bit of running around w/o trolling at another lake. That burned just under 5 gal. I don not any more time on the water with this rig.
wrangler	#8  Posted on 02/23/12 - 4:41 AM
Member Posts: 264 Comments: 0 Joined: 03/14/08	1979 Montauk with T top Yamaha 90 HP 4 stroke. Depending on whether I am going with the tide or not and with 2 people on board I get 5-6 miles per gallon. That is running 4000 RPM with a speed of 20 MPH and only slowing for no wake zones. I have a 26 gallon fuel tank.