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Author Topic:   Improving New Sport 13 Performance?
Bryan jones posted 06-12-2000 09:54 AM ET (US)   Profile for Bryan jones   Send Email to Bryan jones  
I just bought a new Sport 13 with the 30hp two stroke Mercury. I was wondering if anyone out there has tried any thing to get better performance out of the hole for this motor without sacrificing top speed. Any body tried a stainless steel prop or hydrofoil fins? Thanks
Mako posted 06-12-2000 08:11 PM ET (US)     Profile for Mako  Send Email to Mako     
I believe Bob (username: rjwii) was planning to install a Doel-fin on his 13' Sport this weekend. Maybe he would be so kind as to let us know how it worked out, details of the install, etc...
rjwiii posted 06-12-2000 08:43 PM ET (US)     Profile for rjwiii  Send Email to rjwiii     
You're right, Mako. I got it installed Sunday morning but couldn't get the boat out. I'll be spending next week in Galveston bay and will have opportunity to try it out. I got a GPS for father's day (early!), so I will be able to report boatspeed in addition to info re planing under a load, tubing etc.

Installation was easy...twenty minutes, just follow instructions on the box. Four 1/4" holes drilled in the cavitation plate and bolt the fin on. I had to position the fin with about a 3/4" overlap past the end of the plate so I could get the drill in a vertical postion when drilling the forward holes. I'm just a shade tree mechanic, so hopefully I did it right. I'll let you know more when I get back.


Clark Roberts posted 06-12-2000 09:02 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Bryan, here are my suggestions: install doel fin (brand name "Doel-fin") per instructions; raise motor so that anticavitation plate (the plate onto which you install the fin) is an inch above the hull bottom (use the adjustment holes in motor's mounting yoke); check that engine is actually getting full throttle (move throttle fully forward and then look into carb throat to see that butterfly valve is horizontal); install a tachometer if you don't already have one; get some test props from dealer or prop shop (preferably stainless)... select prop that allows 5500-5700rpm at WOT and trimmed up. One inch of pitch generally gets you 200 rpm either up or down.. play with weight distribution (more weight aft will probably get a little more top speed but will hurt the hole shot...
My guess is that a 13" pitch will do the job. Yamaha props for the 40-50hp models will fit your Merc also.... good luck and happy Whalin'.... Clark.. Spruce Creek Navy
rjwiii posted 06-28-2000 05:54 PM ET (US)     Profile for rjwiii  Send Email to rjwiii     
I had my Sport 13 on the West Bay at Galveston last was lousy, by the way. I had installed a Doel Fin a week earlier and found that it helped the hole shot without dropping top end speed. It jumped right up on plane with three adults aboard. I checked the speed with a GPS in a chop with the Bimini up and my wife and I aboard (about 350lbs total). At WOT it was turning 4800 and speed was 26 mph. It has the stock aluminum prop. I figure without the Bimini, without the wife, and on smooth water it may do the 30 mph indicated elsewhere by someone who had talked to Whaler.

As for tubing, in a light chop, it got on plane pulling my 120 lb daughters in the tube. The boat worked some to get on plane doing it. Most parts of the West Bay are very shallow (1' to 6'), so the little whaler was a perfect fit. Now if only I could find the fish!


tbyrne posted 07-03-2000 11:02 AM ET (US)     Profile for tbyrne    
While I can't help with hole-shot ideas, I wanted to relate the results of my changing from a 10 and 7/8 x 11" prop to a 10 and 5/8 x 12" prop on my 2000 Sport 13 with a 25 hp 4-stroke.

The taller pitched prop gave me about 5 mph top speed (to 37 mph) and perhaps more significantly, 24 mph at 4,500 rpm (up from 18 mph at 4,500 rpm). Full throttle with the 12" prop is 5,850 versus 6,050-6,100 with the 11". This was on flat water with no wind.

I should point out that I run the boat very light, with only me (175 lbs.) and 20 or 30 lbs. of fishing gear. I didn't notice any great dropoff in hole-shot, but then again, I wasn't pulling a skier or tuber.

alvispollard posted 07-18-2000 06:52 AM ET (US)     Profile for alvispollard  Send Email to alvispollard     
BW is now putting 40 HP on the Sport 13 according to Portage Marine in Port Clinton, Ohio. There must be a problem with the hole shot using a 30 two stroke or 25 four stroke. I think it is a shame that so many BW dealers are not participating in the advertised $7995 Sport 13 you see in every boating magazine. The most advertised item in recent years and some are asking $8495. Portage Marine is honoring the advertised price.
My father is considering the Sport 13. He is a good size man at 6'3" and 260 lbs. Has anyone noticed a problem for a large person moving around on this platform? Has anyone tryed this boat and a 40 hp as far a the hole shot?
bigz posted 07-18-2000 08:18 AM ET (US)     Profile for bigz    
Well it might be a tad small for your dad to feel comfortable --- the 13 Sport has been rated for 40hp max for years by the way -- information posted else where on the forum indicates this may be the last year for the "classic" 13 --- would go over and get a test ride with your dad and then decide would be my suggestion -- I am 6'1" about 225lbs and the 13 is fine --- Tom

PS welcome to the forum

pgilbo posted 07-18-2000 12:12 PM ET (US)     Profile for pgilbo  Send Email to pgilbo     
Hi everyone - this is my first posting.

I have had 2 Sports. The engine (30 Merc) ran so poorly on the first one, that the dealer replaced the whole rig. Unfortunately, it seems like the second engine isn't much better. I am trying to figure out if it's just me, or should I be talking to Mercury. My main complaint is idle to 2000 rpm. The engine surges and shakes and misses quite a bit. The neutral idle speed is about 1200, and in gear idle about 1000. There is a sticker on the engine that states the in gear idle should be no greater than, I think 750 or 800. If I adjust the idle down, the engine stalls. With the ears on it to flush the engine, the whole boat shakes and the engine sounds like it is missing. I just got a second opinion from a Merc authorized mechanic and he couldn't find anything wrong with the engine. Are all of you happy with your engines? Maybe it is just me.

I put a doel fin on mine, too. It planes OK with just me on board, but takes a while with two people. I need to increase the hp somehow. I was able to increase the performance of my 9.9 Evinrude by installing the 15 hp carburetor on it. Ran it for 10 years that way - worked great. According to my shop manual, the specs (bore, stroke etc)on the 40 hp 2 cyl. are the same as the 30. A new carb for the 40 is about 160.00. Does anyone know for sure that this won't work? I am also thinking of replacing the engine with a 40 hp Yamaha 4 stroke.

I installed port and starboard cleats on the flat areas where the gunnels meet the transom. These areas are reinforced with phenolic material, so I drilled and tapped 1/4-20 machine screw threads and mounted the cleats with oval head phillips machine screws, works great.

I also designed and installed a seat back on the helm bench seat. Makes all the difference in the world. If you don't feel like building your own, there is a vendor that sells them. I don't have the URL right now, but I will post it if anyone is interested. They also sell cushions custom made for the 13 Sport. Maybe you all already know the vendor? They supposedly have been making Whaler factory replacements for some time.

My next investment is a bimini. Can anyone recommend a vendor and model?

It's a great little boat - I just wish my engine performed better!!!

Well that's about it for now. Have a nice day. Paul

whalernut posted 07-18-2000 06:42 PM ET (US)     Profile for whalernut  Send Email to whalernut     
I think alvispollard is talking about the new `13 Sport they are putting out. They first came out with a choice of 30h.p. 2-stroke or 25h.p. 4-stroke. Alvis is saying Whaler is going to put 40h.p. engines on these boats to better the performance. Also Alvis, I am 5`9" tall and 250lbs. and I sat in the new `13 Sport and I would bet the seats would break at some point if I used the boat long enough. The seats seem thin and cheap. I personally didn`t like the boat quality overall, maybee you will. Also Surf-N-Turf marine in Erie,PA. is also honering the $7995 advertised price. Buy the way the EZ-Loader trailer they have in the package is very cheap, and does not come with a single keel roller. Be carefull with the new Whalers, I would question the quality? Regards-Jack Graner.
Clark Roberts posted 07-19-2000 12:30 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Paul, check with merc parts dept on 30/40hp Merc differences,,, but to my knowledge, the only difference is the reed valve stops. These are two circular gadgets that provide the stop (opening distance) for the reeds and a simple bolt on affair... just behind carb... carbs are identical I think... replace 30hp reed stops with 40hp reed stops or just remove the 30 hp reed stops and bend them out to the 40 hp stop dimension.. simple as falling off a log... I have hopped up several 30hp Mercs by doing the above and by advancing the timing stop approx an eighth inch... results are a real powerful screamer... the stock 40hp can be tweeked easily also... I have had three 30hp Merc 2 strokers and two 40hp 2cyl 2 strokers and all ran and idled smoothly and quietly..Can't figure your rough idle problem.... remember that on the hose there is no water head in the exhaust and idle cannot be adjusted unless in the water... you need the proper back-pressure provided by the "head" to adjust properly... Happy Whalin'.... Clark... The Old Man and the Sea
pgilbo posted 07-19-2000 06:56 AM ET (US)     Profile for pgilbo  Send Email to pgilbo     
Thank you for the information, Clark. I will look into the reed stops. It is also good to know that the engine has the potential to idle smoothly. Have a nice day.
Bryan jones posted 07-20-2000 10:08 PM ET (US)     Profile for Bryan jones  Send Email to Bryan jones     
My 13 Sport is 7 months old now and I consider the quality of the boat to be excellent. No problems whatsoever. Somebody mentioned the poor quality look of the trailer and I have found it to be excellent also. It is very nicely suited to the boat. It is a breeze to load and it has some nice extras on it like step pads that run the length of the trailer. The boat is way under powered though with the 30hp. I tryed to take out a total of 4 light people in mine and it would NOT even come close to planning.I wrote Boston Whaler complaining about this and all they told me is the 2001 13 sport WILL have a 40hp. Well, that is great for the new buyers, but what are the rest of us suppose to do that have shelled out our $8500.00 for a boat that will barely plane with a light load? Surely someone at BW noticed this before they put it out on the market. The least they could do is offer current owners some kind of kit they could purchase to make their 30's a bit more peppy. That reminds me, does anyone know an e-mail address for Mercury Marine? I could not find one on their site.
andygere posted 08-04-2000 01:46 AM ET (US)     Profile for andygere  Send Email to andygere     
My old 13 ran pretty quick with a Merc 40 (1984), even with a decent load. I won more than a few races with other 13's running Yamaha 40's. The Merc is a piece of junk though and has failed me frequently despite care and maintenance (head gasket, ignition, internal shifting). The "Whaler Gods" at Nauset Marine have taken a large chunk of change off me to keep this clunker running. By the way, their out-the-door price for the Sport 13 is more like $10K. They also informed me that you can't get a new short shaft 40hp motor....not true! Merc make them in both 2 and 4 stroke. So much for the experts. There, I feel much better now.
whalernut posted 08-04-2000 07:35 AM ET (US)     Profile for whalernut  Send Email to whalernut     
Andy, it seems in the past that Mercury has gone with top end speed and have sacrificed quality and dependability. I know a few people that got really frustrated with their older Mercs. Lately though I have heard very good things about the new Merc. outboards. I am an OMC outboard fan, because of great reliability in the past, but have heard bad things lately about the newer OMC`s. I know a guy with a 95` 70 h.p. Evinrude that was broken down alot. It was on a `15 Dauntless. The engine finally fell under the Lemon Law? and the dealer finally gave him a new engine. I haven`t talked to him since, so I can`t say anything about the replacement engine. I also like OMC`s because of the simple designs and the fact that you can get parts and accecories almost anywhere. Regards-Jack Graner.
andygere posted 08-06-2000 01:31 AM ET (US)     Profile for andygere  Send Email to andygere     
I think you're right about the performance-quality trade off with Mercs. My 40 spent over 2 weeks at Nauset Marine waiting for ignition parts. By the time they came in, I was back in California for a week. My dad picked up the boat just in time to put it away for the season after his 4 week vacation was over. I just bought a 79 Montauk (Today!) with a 79 Johnson 85. I checked the compression, and all 4 cyls. tested at 125 psi (factory spec). More impressive is how well that engine runs. During the sea trial this morning, it started on the first click, and just purred as we idled up the harbor. Even at it's best, my Merc sputtered and vibrated at idle speeds. Out in the ocean, the Johnson accelerated like a demon, planing quickly at about 3300 rpm with 3 aboard. I was nervous about buying another older engine, but I'm not anymore. This motor is a honey. Thanks for the advice and perspective.
lhg posted 08-10-2000 09:55 PM ET (US)     Profile for lhg    
Just a note on engines. All brands, when they are well maintained, with properly functioning parts, as they were designed, should be fine for a Whaler. And all brands, when they are not properly maintained, worn out, misrepresented or poorly serviced, are not fine for a Whaler. There seems to be an awful lot of comparing a well maintained engine of one brand, with a poorly maintained, or worn out, engine of another brand. And as we all know, the quality of Dealer engine service work varies immensely.
Mention any brand of engine to me, and I'll tell you a great story, and I'll tell you a horror story. We all know these stories.
andygere posted 08-18-2000 09:57 PM ET (US)     Profile for andygere  Send Email to andygere     
I respecfully disagree. While taking care of any mechanical equipment is critical for good performance and long life, some outboards were simply poorly designed and cheaply made. I have owned several, and provided each proper care and maintenance. Of these, some performed well and lasted a long time with little trouble. Others, such as my Merc 40, were fraught with problems, aggrevated by poor parts availability, and poor service from factory trained dealers/mechanics (such as Nauset Marine). This is not to say that all Mercs are bad, or for that matter, that all mechanics at Nauset Marine are not competent. What I do stand by is that my Merc 40 is junky motor, and I've yet to get reliable, timely service from one of their largest dealers.
lhg posted 08-19-2000 06:49 PM ET (US)     Profile for lhg    
Andy: If you're talking about the old Merc 2 cylinder 35/40 engine, I would agree. It was a dog and not one of Mercury's finest moments. Very unusual for them. However, if you're talking about the 4 cylinder engine, made in 50/45/40 HP versions, I would have to disagree. This was one of the smoothest, best performing mid range engines ever made. I had a 1970 version of this engine on a 13' Whaler, and it was a screamer, reliable and trouble free. One of the first engines made with CD ignition. Wasn't an OMC engine around that could compare with it back then. Mercury produced this engine for almost 30 years, ending up by calling it a "Classic 40".
andygere posted 08-20-2000 11:26 AM ET (US)     Profile for andygere  Send Email to andygere     
It is a 2 cylinder Mercury 40, 1984, no tilt or trim. For what it's worth, I had a 1968 Evinrude Lark 40 that was really reliable and trouble free.

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