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  Repower Montaulk W/60hp 4 stroke Yamaha - Thoughts?

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Author Topic:   Repower Montaulk W/60hp 4 stroke Yamaha - Thoughts?
Tad Seckinger posted 02-23-2004 01:11 PM ET (US)   Profile for Tad Seckinger   Send Email to Tad Seckinger  
We recently purchased a 2003 Yamaha 4 stroke 60HP to repower my fathers 17' Whaler. looked all over the Internet before finding a motor at a dealer locally in Fla. still in the crate for under $5K. With a five year warranty it looked like a great deal. The boat originally had an Evinrude 70hp the same vintage as the boat (83' I think). The thing ran but you could hear the pistons rattling in the cylinders so it was time for a transplant. We've decided now is the time to do a complete restoration on the boat and install all new mechanicals. We've had our mechanic remove the old motor and he will hang the new one once the hull is ready. Ive purchased all new Yamaha controls, tach, switch and steering helm in preperation for the refit. I will rig the boat but want an authorized dealer to prep the motor before we launch her. Does anyone have any suggestions or advise on this setup? The dealer will set us up with several props for testing so we should be good to go. I've got a GPS so I'll take notes on the prop selection and try to post the data to the forum when completed. I've read quite a few posts from other 17' owners that have 4 strokes so I value your experiences with this configuration.
Bigshot posted 02-23-2004 02:05 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
2 things....you need to break in the BEFORE you can test it so that will be about 10+hours. I am guessing a 14 or 15" Stainless prop, especially if you have the bigfoot(high thrust) lower unit.

2nd the old 70's always sounded like the pistons were rattling....kinda like a diesel. If you owned it for a while then you knew it was time. If you just bought it, you might have acted too soon. Nonetheless...most older hulls were mounted on 16/17' transoms in the blind holes. For best performance you will need to raise the engine about 2" off the transom, not flush on it. To do this you MAY need to fill in the old holes and drill new or better yet, buy a manual jackplate and bolt that into the blind holes then mount the engine to it. This will give you less draft and probably 2mph better top end due to less drag. Good luck!


elaelap posted 02-23-2004 09:46 PM ET (US)     Profile for elaelap  Send Email to elaelap     
Tad,

I just posted this on another topic:

I run a 50 hp Yamaha four stroke High Thrust on my smirkless 16/17 (Katama) and like the set-up very much indeed. I use my boat mainly for fishing alone or less often with one or two others. Three or four aboard make the boat sluggish out of the hole, but she jumps right out with one or two aboard. With two aboard plus fishing gear she makes 5900 turns WOT with a 13" pitch stock aluminum prop, which gives her 30 mph/GPS. Great fuel economy--1.25 to 1.5 gallons/hour at cruising speeds between 18-22 mph, and I can't monitor the fuel use trolling or drifting for hours with the motor on...just doesn't register on the gauge. I don't waterski or wakeboard, but I'm sure the motor would be inadequate for those pass-times.

The two main criticisms I've heard regarding my "grossly underpowered" craft are, 1) I have to run the motor at higher RPMs to reach a decent cruising speed, which may be true...I've gotta get up above 4000 RPM to hit 20 mph...and this probably means more wear and tear on the motor; and 2) I don't have enough reserve power to get out of trouble in weather or big seas, which I haven't found to be true, and hope to hell never proves to be so...I fish in relatively challenging conditions north of San Francisco, but I'm fairly cautious about going out in real nasty stuff, limited as much by the size of my hull as my motor's power. I feel in control with plenty of reserve power surfing down 8-10 foot swells, which are common in these parts and not a big deal unless there's a little blow across 'em. I credit the slick, seaworthy design of the 16/17 for the boat's handling abilities even under relatively low power.

Dick, a long-time CW member and a very experienced old Whaler hand, also ran his 16/17 (a Montauk) with a 50 hp motor...he's had years' more experience than I...hope he responds to your question too. I think a lot of charter or rental Montauks run 50s or 60s also.

So Tad, as to your specific question regarding props, a 13" pitch prop is perfect for my 50/High Thrust...whether you want to go up a little or not, since you've got 20% more horsepower, I'll leave to the wiser, more experienced hands. I'd say that a 13 might be a good starting place.

Tony

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