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Author Topic:   Several dumb questions.
GRMPer posted 04-11-2002 03:52 PM ET (US)   Profile for GRMPer   Send Email to GRMPer  
I'm new to boating. I have signed up for Power Squadron, but it's in a few weeks.

I've been putting around in a 13 sport, 25 hp 4-stroke getting the hang of it.

Question 1) The engine seems to spin very fast for the speed it's going. It doesn't plane until 4800 rpm and I'm only supposed to go to 5200-5700 rpm according to the manual. My limited knowledge of these things tells me that I should go to a higher pitch prop.

2) What angle should the engine be when trailering? It's got one of those little pin support dealies....Is that how it's trailered?



jimh posted 04-11-2002 05:09 PM ET (US)     Profile for jimh  Send Email to jimh     
Engine Position When Trailering:

If the engine and boat are carried high enough on the trailer to have sufficient ground clearance, you can trailer with the engine in the tilted-down, operating position.

If you cannot trailer with the engine in the operating position, it is best to tilt it up and use a mechanical lock to prevent it from coming down. Usually the engine mount provides some type of mechanical locking pin or bar that will retain the engine in the full-up position.

If you have hydraulic trim, there are usually two ranges for the trim: an operating range, where the hydraulic rams have considerable strength (because they can adjust the trim position while the engine is operating at full power), and a tilt range, where a separate ram takes over and just provides a rapid tilting of the engine.

When I trailer I leave the engines down, but I raise them to the top of the tilt range. This leaves the engine sitting against the stronger tilt rams. If this position does not have enough clearance, then you probably should tilt all the way up and use the mechanical locks.

(The technique of raising the engine to the top of the trim range was taught to me by LHG, who has over 100,000 miles of successful Whaler trailering experience.)

On my 15-Sport, the boat is carried rather tall on the trailer (which has 13-inch wheels), so there is enough clearance to just trailer with the engine down. That engine has no tilt or trim, so it just rides against the trim mechanical stop. With that boat the only time the engine gets tilted up all the way is when launching from shallow ramps where I am leery of how much water there is as the boat slides off the keel-roller trailer.

If you are forced to tow with the engine tilted up, it is probably better to tilt it up all the way and use the mechanical stops rather than stopping part way and having the tilt ram take the load all the time.

Some folks also use a supporting bar to connect the outboard lower unit near the prop to the trailer frame, but you may get different opinions on the wisdom of that. It does seem to be commonly done with bass boat style boats with rather large engines hanging off them.

If you have an all-bunk trailer your boat is probably carried lower on the trailer and you will need to tilt the engine up. In some cases you have to tilt the engine before hauling out, or you can turn the outboard lower unit into a pavement etching tool.


GRMPer posted 04-12-2002 08:47 AM ET (US)     Profile for GRMPer  Send Email to GRMPer     
thanks for the good response. The support pin for this engine is such that fuel leaks out of the carb when it is tilted that much! seems like an odd design for new boat.


Bigshot posted 04-12-2002 12:29 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
What is your max RPM at WOT?

If you can exceed the max(5700?) then you need a bigger pitch. You should eb able to plane lower than 4800. Your tach might be off too.

What size prop is on there? Some here have that boat and may be able to help.

GRMPer posted 04-12-2002 12:33 PM ET (US)     Profile for GRMPer  Send Email to GRMPer     
going by the tach, it's at least 5800...I backed out before it got higher than that as A) it was exceeding the max rpm B) I'm a newbie to boats


tbyrne posted 04-12-2002 04:22 PM ET (US)     Profile for tbyrne    

I have a 2000 Sport 13 with the 25 hp four-stroke & I believe the max rpm are 6,000. The original prop is an 10 7/8" dia. x 11" pitch, which will rev to 6,200 rpm if the boat is loaded lightly. A 12" pitch prop will bring the rpms down to 5,800-5,900 if lightly loaded.

If you usually are going to run the boat with several people aboard, you'll find the 11" pitch to be about right. If you will run the boat lightly loaded, 12" pitch should do it. If you will be loading the boat with gear or people, you can probably drop down to a 10" pitch prop. Your dealer can help you.

As to trailering and trim, check your motor's owner's manual - that round pin is useless. You are not supposed to rest the motor on it. I suggest following Jimh's advice and tilting it all the way up. I have always done so and have not had any problems.

Good luck!

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