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El Rollo

That's a heavy outboard for a 15. I'm sure in calm waters it'll be fine . . . I would highly recommend keeping the rest of the interior of the boat as light as possible. Have you considered a small set-back manual jackplate? I know it'll push the weigh even further back, but it would allow you to ad...

El Rollo

Sapele would be a great alternative.

El Rollo

You could try 'Apitong'. It's often used in truck beds, or heavy equipment trailers. Looks similar to Mahogany and costs a lot less. It's not the easiest to finish, and pre-drilling holes is a must when screwing together pieces. It's been used in boat construction, and wears well outside. I believe ...

El Rollo

I would love to see pictures of your set up ! This sounds like a really nice set-up.

El Rollo

If you're really looking to get maximum performance, you may want to consider a manual jackplate. A 4 or 5 inch setback is all you need, and you will be able to adjust the motor height further, and more precisely. I have a 1988 15 Boston Whaler, and when I originally purchased the boat it had a 'doe...

El Rollo

Great numbers. Sounds like you have it dialed.

El Rollo

That thing is so cool!
Good Luck with the sale !

El Rollo

Oldslowandungly--I think you will be happy if you decide to go that route. I have mine mounted on their side for clearance under my seat. (one of the nice features of agm). I have them secured with a bracket/ holder I built to eliminate any movement etc. They seem to charge rather quickly, and hold ...

El Rollo

I have a motorguide 24 volt 80 lb thrust trolling motor mounted on the bow of my 1988 15 Whaler. I use 2 Lifeline GPL-U1T AGM Batteries and am very pleased with their performance. They are pretty compact at 7.71 inches in length 5.18 Wide and 6.89 inches tall, weighing 24 lbs. The lifespan on mine h...

El Rollo

A three-blade propeller will get you the best top-end speed for sure. Something in 16-inch pitch will be a good starting point.

El Rollo

You are over-propped for your set-up. I made the same mistake when I re-powered from a Yamaha 70 two-stroke engine. The three-blade propeller that ended up working best for me was was a Yamaha Performance Series 13 1/4" x 16" ( MAR-GYT3B-V4-16) Keep in mind I added a significant additional...

El Rollo

I have a 1988 Boston Whaler 15 footer that I customized a little for my needs. It is powered by a Yamaha F70 with 5-inch Bobs Machine manual jack-plate. I have played around with propellers. Tomorrow I will look at the specific brands, pitches, and diameters , and provide some accurate information r...

El Rollo

Agree with you 100% Jim. I miss that dealership, even though they were a bit 'crusty' as times, their work was always top notch.
We have some boating trade-shows coming to our area in the coming weeks, I will try my best to get a price on the new Yamaha VMAX SHO 90 just out of curiosity.

El Rollo

Jefecinco - I'm sure you are right. I was kind of regurgitating what I have read about insurance companies denying a policy if the outboard exceeded the maximum horsepower rating of the boat in some states. Funny Story: before I re-powered my 1988 Boston Whaler 15 with the Yamaha F70, I went in to o...

El Rollo

I chose the square. I wasn't aware there was a differences in how the information is displayed between the square and round Command Link Gauge. If I remember correctly, I was told by the dealership that they were identical except the shape. I've never had the round Command Link Gauge, so I have noth...

El Rollo

In my opinion most of these H.O., SHO, ProXS, or SS models, are a combination of a workaround and a marketing tactic. Yes, they do feature FANCY graphics and cowling decals, some more wild than others. But I think the reasons some people select them in their quest for performance, is technically the...

El Rollo

I see this with Mercury and their ProXS designators. Evinrude has their H.O. models, Yamaha has their SHO models, and Suzuki has three models in their SS line (which is only a trim, cowling graphic, and paint change-up, with no mechanical changes). With the exception of Suzuki, all three manufactur...

El Rollo

During the initial press release when this engine was brought to market there were banners and promotional images that listed it as the VF 90--which I don't find important. As for its actual and correct identity, I haven't a clue. It is a new model in the V-max line: an In-line four-stroke 90-HP out...

El Rollo

What are the thoughts of others on the newly released Yamaha VF90 outboard? The VF90 specifications appear to be identical to the F90, including weight. I am sure there are significant differences, but to the average consumer it appears very similar to the F90. I assume the fuel mapping is one of th...

El Rollo

I have a Yamaha F70 on my 1988 Boston Whaler 15-footer. I selected the Yamaha Command Link Tachometer Multi-Function Gauge. I am extremely happy with it. I also purchased the Remote Water Pressure Sensor from Yamaha. This allows you to read the engines water pressure within the Command Link Gauge. F...

El Rollo

I had good luck with my Yamaha 90HP two-cycle with using a small pitch Powertech SCD4 semi-clever propeller: http://www.ptpropeller.com/content-product_info/product_id-9893/powertech_scd4_stainless_propeller_yamaha.html That looks like a good propeller. Thank you for sharing that information. I kno...

El Rollo

It's not that exact, or at least I wasn't - just point the open end toward the head and not the crankshaft. In practice, having the open end anywhere around 3 would be fine. I only bought 4 plugs. 2 lined up fine and the other 2 I had to swap between cylinders. Copy that. Thank you. I will try it n...

El Rollo

I'd love to test my F70 on a dyno but only if the participants in the debate will foot the bill! But indexing is trivially easy and costs nothing so I am planning to continue to do it. I do agree that plug orientation will be more critical in a direct injection motor - with indirect injection and p...

El Rollo

Phil T wrote:Invest in a Yamaha Service Manual ...

Great Info--thank you. And I will purchase that service manual.

El Rollo

How do you know the correct indexing position of the spark plug In terms of a clock hands, like 12-3-6-9?

I know there are four valves per cylinder on the Yamaha F70, so which position do you need to direct the plug?

I would assume you want the plug to point toward the intake valves.

El Rollo

This is how it's broken down on the two-page invoice: Water Pump Repair Kit - $94.20 Labor $130.00 Shop Supplies $2.60 Job Subtotal $226.80 100 Hour Service Element Filter- $21.65 Anode - $10.75 Tab-Trim - $23.60 3 0z. Grease - $4.25 Gasket - $2.30 10W 30 Marine Oil FC - $21.05 Strainer 1 - $24.75 L...

El Rollo

I would like to offer further insight into the Yamaha F70, after just getting mine back this week from an authorized Yamaha service center for a 100 hour service. Let me start by saying that this was only the second 100 hour service I've had done on the motor (which I use primarily in saltwater). Th...

El Rollo

In my opinion, you will be very happy with the F70. My 1988 Boston Whaler 15 had a Yamaha 70 two-stroke-power-cycle engine. I re-powered with the newer Yamaha F70 (four-stroke-power-cycle engine). I am a two-stroke fan and was reluctant shifting over to four-stroke. I must say that I am 100-percent ...

El Rollo

I believe what often happens is a Boston Whaler boat owner spends $400 for a set-back bracket, takes a lot of time and labor to install it, and then really never completely evaluates what effect it has had. After all the time and expense of installing one, there is a bias toward finding it has impr...

El Rollo

Don't Do It !!!!
Boats are a nightmare !!!
--I laugh aloud-- !

El Rollo

[My boat has a jack plate made by] Bob's Machine Shop, the five-inch manual version. I'm very satisfied.

El Rollo

I have a 1988 Boston Whaler 15-footer with a Yamaha F70 four-stroke-power-cycle engine mounted on a Bob's Machine Shop 5-inch manual jackplate. This is a re-power from the original Yamaha 70-HP two-stroke-power-cycle engine. I'm am 100-percent satisfied with the way the boat sits and the outboard pe...

El Rollo

I also have a 1988 Boston Whaler 15 that I rebuilt. It was originally powered with a 70 Yamaha 2-Stroke, which I replaced with a new Yamaha F70 4-Stroke. I am 100% satisfied with my choice, and have never had a single concern with the new motor. As you've probably heard so often, it runs very quiet,...

El Rollo

As mentioned above, weight is going to be one of your biggest considerations. You mentioned restoring the hull: what is the condition of the hull? Many Boston Whalers I've seen in California have been stored in water for long periods of time and have bottom paint. It is not uncommon for these hulls ...

El Rollo

I seem to remember reading somewhere that 1977 and prior Boston Whaler 15-foot boats had a maximum horsepower rating of 75. Does you Coast Guard capacity plate (if it's still intact) show that? Just curious.

Congratulations.

El Rollo

My Dad and I built a really cool one. Very small but extremely useful. It doesn't have to be that big of a project . . . although we went excessive on a few things. One of the nice features was to use hydraulic steering . . . routing the hoses was much easier and cleaner than had we used cable steer...

El Rollo

Great thread, and the reply [above from] Flymo is spot on. I completed a full restoration and customization on a 1988 Super Sport. I re-powered with a Yamaha F70. One of my main goals during the process was weight savings along with simplicity. By the end of the project, I had still added weight to ...

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