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Author Topic:   90hp Yamaha Mounting on Montauk?
John from Madison CT posted 05-05-2002 08:14 AM ET (US)   Profile for John from Madison CT   Send Email to John from Madison CT  

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?



gunnelgrabber posted 05-05-2002 01:14 PM ET (US)     Profile for gunnelgrabber  Send Email to gunnelgrabber     
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
ChrisCT posted 05-05-2002 05:39 PM ET (US)     Profile for ChrisCT  Send Email to ChrisCT     
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!

chad posted 05-05-2002 11:33 PM ET (US)     Profile for chad  Send Email to chad     
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.
jimh posted 05-05-2002 11:56 PM ET (US)     Profile for jimh  Send Email to jimh     
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.

Clark Roberts posted 05-06-2002 05:29 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
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
Bigshot posted 05-06-2002 10:18 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Raise it but no fin necessary with that setup. I only got 41.
ChrisCT posted 05-06-2002 01:36 PM ET (US)     Profile for ChrisCT  Send Email to ChrisCT     
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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