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ContinuousWave: Whaler Repairs/Mods
90hp Yamaha Mounting on Montauk?
|Author||Topic: 90hp Yamaha Mounting on Montauk?|
|John from Madison CT||
posted 05-05-2002 08:14 AM ET (US)
I've taken about a dozen trips on my Montauk so far this Spring. The 90hp Yamaha is a charm. Nice low end, hole shot etc.. Spins 5300RPMs with the Yammie 17" SS prop.
Anyway, the motor is mounted all the way down and I was wondering if I'm sacrificing speed this way. I get barely 39-40mph (not knots) with this set up with me alone and maybe 20gal fuel.
Anyone with a Yamaha 90hp getting higher speed and have the motor mounted up somewhat?
posted 05-05-2002 01:14 PM ET (US)
lots of evidence here reported on that setup that says: 41-42 mph is about the size of it.(my interpretation).
makes a mellow senior citizen like me think i might have to try one of those 90 hp carl kiekhaefer alternatives...good luck...lm
posted 05-05-2002 05:39 PM ET (US)
Hi John! Put my Montauk in water today in Fairfield and drove over to the boat club slip in Stratford. The 70 Yammy was running great until we got a mile off shore. Doin about 30 MPH at 2.5 RPMs and all of a sudden 1.5 RPMs and 8 MPH - with throttle at 75%.... Then we knew (after wondering how hard it would be to paddle if Engine totally stopped)
Well we got to the boat club and into the slip - and my friend from work showed us the amount of space we had etc. (30 ft or so - Woohoo). Then we took top of the engine and saw one of the spark plugs had fallen off - 'sigh of relief'... Took out plug cleaned a little oil of and headed up the Housatonic river - (at top speeds - we broke 30 (woohoo again). Put her back in the slip and that is my first day as a boater...
So plan on going with the wife and practicing getting in and out of the slip this week (when no one is watching), ohhh had a close call going out the first time (sticky throttle and it speeds up fast - even w/ other boats in way) will save that story for another day. Hope to see you out there someday!
posted 05-05-2002 11:33 PM ET (US)
I have a 84 Montauk with an 84 Yamaha 90. Bought the boat with the motor mounted on the top hole,the boat would run 40ish. During her pre-summer maintenance I had the BW dealer raise the motor one hole and I added a dole-fin, hoping to improve the shallow water performance. With the motor in the higher position I lost speed and the fin kicked up a spray when on plane. After running this set up a season I am returning the motor to the original setting and removing the dole-fin this season. Just my two cents.
posted 05-05-2002 11:56 PM ET (US)
I was reading your post and knew what the problem was before you took the cowling off.
The same thing happened to me. I have the plug wires/rubber boots held on with nylon Ty-Raps. I haven't had one fall off since.
posted 05-06-2002 05:29 AM ET (US)
John, suggest you raise engine so that anti-cavitation plate is at least one inch above keel (personally I would raise to 1 1/2 inches and add a Doel-Fin)... Happy Whalin'.. Clark.. Spruce Creek Navy
posted 05-06-2002 10:18 AM ET (US)
Raise it but no fin necessary with that setup. I only got 41.
posted 05-06-2002 01:36 PM ET (US)
JimH - Wish we had you out with us - we were way to scared to turn the motor off - hehe. Someday when the internet matures we will be able to be on live and share experiences advice etc while on our boats!
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