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Author Topic:   Tilt range at mooring, 25hp 4-stroke

BobL posted 05-13-2014 08:53 PM ET (US)
Would appreciate any help in figuring out which four stroke 25hp outboards have the tilt range to tilt up all the way out the water at mooring. I have a 1973 Sport 13 with a 20” transom. Interested in repowering. Want to buy an engine that will not have the skeg submerged at mooring (like my current 25 hp Yamaha 2-stroke). My boat is light and sits high in the water. The issue is tilt range not weight of boat or placement of gear. Thanks...
contender posted 05-13-2014 09:08 PM ET (US)
Well kinda, If the boat weighs more in the back the engine has to tilt farther to get out of the water. The old 20 inch transom maybe the problem, I can not think of an engine that tilts more than the other. The only other way that I can think of is a hyd. backplate to raise the engine straight up and then tilt it.
rogerarnal posted 05-14-2014 12:53 AM ET (US)
My friends put two five-gallon-buckets of water on the bow.
blacksmithdog posted 05-14-2014 08:16 AM ET (US)
I had a 25hp 4 stroke Merc on my 13'. I don't think I have any pictures of the boat in the water with the engine tilted up, but here's one of it on the trailer with the engine tilted up and resting on the motor support:
http://i473.photobucket.com/albums/rr97/blacksmithdog/ 13%20Foot%20Boston%20Whaler%20%20Albion/DSCN0568.jpg
Jefecinco posted 05-14-2014 09:06 AM ET (US)
Bkacksmith--Your 13 is set up virtually the same as mine, except your engine is mounted as high as possible. My 30-HP Mercury FourStroke is not mounted as high, and my 13 is a Sport, so it is possibly a bit heavier in the stern.
The skeg on my engine remains in the water when tilted as high as possible with the power tilt. It's very possible my 13 has some water in the hull and Bob, the OP, could also have some water intrusion. I'm not sure comparisons are very useful because the ages of these boats make the possibility of water intrusion possible.
Does your skeg clear the water when tilted to the highest position?
Butch
BobL posted 05-14-2014 10:44 PM ET (US)
The picture below is my current set-up at mooring. The boat is light. You can see that the chines are out of the water. The Yamaha 2-stroke just doesn’t tilt up that high. Blacksmithdog’s Mercury looks like it is tilted up a lot higher. Hard to be sure on the trailer.
http://i24.photobucket.com/albums/c46/blaquidara/ 1973%20Boston%20Whaler%20Sport/IMG_2469.jpg
Tom W Clark posted 05-15-2014 09:42 AM ET (US)
Bob -- Some manufacturers list the tilt range of the their outboards in the specifications for each particular model. Yamaha and Honda, for example with the Honda BF25 having a 64 degree tilt range and the YamahaF25 having a 73 degree tilt range.
Also keep in mind that motor mounting height will have a direct effect on gearcase clearance when the motor is tilted. The higher the motor is mounted, the greater the clearance from the water.
blacksmithdog posted 05-15-2014 09:56 AM ET (US)
I had that Merc mounted by Bass Pro Shop when I bought it from them and they were meticulous about the height of the motor.
The skeg does indeed clear the water.
jimh posted 05-15-2014 10:03 AM ET (US)
Evinrude gives a specification for the trim range and the tilt range of their engines in the service manuals in the section they call Service Specifications. For example, on their 25-HP engine the trim range is 0 to 15-degrees, and the tilt range is 16 to 65-degrees.
Jefecinco posted 05-15-2014 10:24 AM ET (US)
After looking at the pictures and seeing a couple of 13s tied up at our pier with the engines fully tilted up I'm fairly confident that a high engine mounting position with much weight redistributed forward is the only way to get the skeg out of the water. Of course some type of modification such as a set back or Jack plate could also get the job done.
I currently have a starting battery mounted directly behind the rear thwart and a six gallon fuel tank between the thwarts. My 30 HP EFI four stroke Mercury with tilt and trim is mounted a bit low.
I'm considering raising my engine as high as possible and replacing the six gallon fuel tank with two or three three gallon tanks placed under the forward thwart. This would get about 42 pounds forward and add another 21 pounds forward if I install a third three gallon tank. If that fails to get the skeg out of the water I could replace my old starting battery with an AGM battery mounted on it's side beneath the console or the forward thwart. If that fails to get the skeg out of the water I'll just have to try the five gallon bucket ahead of the forward thwart.
The idea of one or two buckets of salt water placed forward is not very attractive due to the chop and boat wakes frequently seen around our pier. The typical plastic buckets are fairly easy to tip over and I'm not keen to have five to ten gallons of sea water sloshing around in my boat.
Butch
BobL posted 05-20-2014 04:55 PM ET (US)
I appreciate all of the information. Thank you. Did not want to make a mistake when I repower this summer.

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Author	Topic: Tilt range at mooring, 25hp 4-stroke
BobL	posted 05-13-2014 08:53 PM ET (US) Would appreciate any help in figuring out which four stroke 25hp outboards have the tilt range to tilt up all the way out the water at mooring. I have a 1973 Sport 13 with a 20” transom. Interested in repowering. Want to buy an engine that will not have the skeg submerged at mooring (like my current 25 hp Yamaha 2-stroke). My boat is light and sits high in the water. The issue is tilt range not weight of boat or placement of gear. Thanks...
contender	posted 05-13-2014 09:08 PM ET (US) Well kinda, If the boat weighs more in the back the engine has to tilt farther to get out of the water. The old 20 inch transom maybe the problem, I can not think of an engine that tilts more than the other. The only other way that I can think of is a hyd. backplate to raise the engine straight up and then tilt it.
rogerarnal	posted 05-14-2014 12:53 AM ET (US) My friends put two five-gallon-buckets of water on the bow.
blacksmithdog	posted 05-14-2014 08:16 AM ET (US) I had a 25hp 4 stroke Merc on my 13'. I don't think I have any pictures of the boat in the water with the engine tilted up, but here's one of it on the trailer with the engine tilted up and resting on the motor support: http://i473.photobucket.com/albums/rr97/blacksmithdog/ 13%20Foot%20Boston%20Whaler%20%20Albion/DSCN0568.jpg
Jefecinco	posted 05-14-2014 09:06 AM ET (US) Bkacksmith--Your 13 is set up virtually the same as mine, except your engine is mounted as high as possible. My 30-HP Mercury FourStroke is not mounted as high, and my 13 is a Sport, so it is possibly a bit heavier in the stern. The skeg on my engine remains in the water when tilted as high as possible with the power tilt. It's very possible my 13 has some water in the hull and Bob, the OP, could also have some water intrusion. I'm not sure comparisons are very useful because the ages of these boats make the possibility of water intrusion possible. Does your skeg clear the water when tilted to the highest position? Butch
BobL	posted 05-14-2014 10:44 PM ET (US) The picture below is my current set-up at mooring. The boat is light. You can see that the chines are out of the water. The Yamaha 2-stroke just doesn’t tilt up that high. Blacksmithdog’s Mercury looks like it is tilted up a lot higher. Hard to be sure on the trailer. http://i24.photobucket.com/albums/c46/blaquidara/ 1973%20Boston%20Whaler%20Sport/IMG_2469.jpg
Tom W Clark	posted 05-15-2014 09:42 AM ET (US) Bob -- Some manufacturers list the tilt range of the their outboards in the specifications for each particular model. Yamaha and Honda, for example with the Honda BF25 having a 64 degree tilt range and the YamahaF25 having a 73 degree tilt range. Also keep in mind that motor mounting height will have a direct effect on gearcase clearance when the motor is tilted. The higher the motor is mounted, the greater the clearance from the water.
blacksmithdog	posted 05-15-2014 09:56 AM ET (US) I had that Merc mounted by Bass Pro Shop when I bought it from them and they were meticulous about the height of the motor. The skeg does indeed clear the water.
jimh	posted 05-15-2014 10:03 AM ET (US) Evinrude gives a specification for the trim range and the tilt range of their engines in the service manuals in the section they call Service Specifications. For example, on their 25-HP engine the trim range is 0 to 15-degrees, and the tilt range is 16 to 65-degrees.
Jefecinco	posted 05-15-2014 10:24 AM ET (US) After looking at the pictures and seeing a couple of 13s tied up at our pier with the engines fully tilted up I'm fairly confident that a high engine mounting position with much weight redistributed forward is the only way to get the skeg out of the water. Of course some type of modification such as a set back or Jack plate could also get the job done. I currently have a starting battery mounted directly behind the rear thwart and a six gallon fuel tank between the thwarts. My 30 HP EFI four stroke Mercury with tilt and trim is mounted a bit low. I'm considering raising my engine as high as possible and replacing the six gallon fuel tank with two or three three gallon tanks placed under the forward thwart. This would get about 42 pounds forward and add another 21 pounds forward if I install a third three gallon tank. If that fails to get the skeg out of the water I could replace my old starting battery with an AGM battery mounted on it's side beneath the console or the forward thwart. If that fails to get the skeg out of the water I'll just have to try the five gallon bucket ahead of the forward thwart. The idea of one or two buckets of salt water placed forward is not very attractive due to the chop and boat wakes frequently seen around our pier. The typical plastic buckets are fairly easy to tip over and I'm not keen to have five to ten gallons of sea water sloshing around in my boat. Butch
BobL	posted 05-20-2014 04:55 PM ET (US) I appreciate all of the information. Thank you. Did not want to make a mistake when I repower this summer.