is this an easy task or hard

[Superfishman186]

Originally Posted by outdoorsron

Hello Gordie: I have an Alumacraft magnum 165 with a Honda 50 tiller. I was able to raise my motor by removing 3 bolts, the 2 bottom and one top bolt, loosen the other bolt and swivel the motor up to the next hole put a bolt in that hole remove the loosened bolt and swivel the motor up to align the next hole and replace the rest of the bolts.I had to do it several times even lowering it back down one hole to get it right. Hope this helps you. Good Luck O - R

That's how I've been doing it, far easier than any other way, unless your motor has slots for the bottom holes than that is even better.

[gordie580]

yea, I screwed up I tightened everything up after i moved up the motor. I should have tested it before aplly 3m5200 sealant. Because now if Iwant ot move the motor it's going to be a *itch. I am hoping this was far enough.

[Superfishman186]

Originally Posted by gordie580

yea, I screwed up I tightened everything up after i moved up the motor. I should have tested it before aplly 3m5200 sealant. Because now if Iwant ot move the motor it's going to be a *itch. I am hoping this was far enough.

I've used 5200 a few times, it's not that bad, had the bolts covered and they pulled out just fine. Used a long putty knife to scrape under the motor bracket and it comes off pretty good, The last time I did use 4200 though.

[gordie580]

I did a Test run today and the boat did plane alot faster in the water that was like glass. I think REW was correct. I think I could have gone at least 1 more up. The fin is still under the water. while traveling on plane. the RPM also raised to about 3800will full trim down. So i think if I go up one or 2 more spots it would be a tad bit better. But that will be a fall project this year I think. It took me 2 hours to do it by my self.
Thanks for all the great advise guys your awesome. Also running on the lake with the motor trimmed up I hit 5,000RPM and the speedo showed right about 48. I don't think the speedo is right, but i need about Max RPM is 6,000 on the tag so I would like to get a couple hundred more RPMS.

[1860Angler]

Originally Posted by gordie580

I did a Test run today and the boat did plane alot faster in the water that was like glass. I think REW was correct. I think I could have gone at least 1 more up. The fin is still under the water. while traveling on plane. the RPM also raised to about 3800will full trim down. So i think if I go up one or 2 more spots it would be a tad bit better. But that will be a fall project this year I think. It took me 2 hours to do it by my self.
Thanks for all the great advise guys your awesome. Also running on the lake with the motor trimmed up I hit 5,000RPM and the speedo showed right about 48. I don't think the speedo is right, but i need about Max RPM is 6,000 on the tag so I would like to get a couple hundred more RPMS.

It sounds like your prop might be a pitch or 2 to big as well, you want to be closer to the 6000 mark than the 5000 when trimmed up at WOT. Moving it up will gain you a little more, but I think a new prop might be in order to get the most out of you boat and motor.

[gordie580]

Originally Posted by 1860Angler

It sounds like your prop might be a pitch or 2 to big as well, you want to be closer to the 6000 mark than the 5000 when trimmed up at WOT. Moving it up will gain you a little more, but I think a new prop might be in order to get the most out of you boat and motor.

I currently run 13x ... 19P aluminum prop. anyone have any idea's on what 90HP Merc 4 stoke would noramlly run. I email Prop man for advise

[McLoki]

I just purchased a new boat with a 90 optimax on it and it came standard with the 13x19p prop.

Right now my motor is setting about where yours is after the adjustment (center hole - maybe 1/2 inch above the bottom of the V in my boat) and I top out at 5200 RPM and 35 MPH. (motor is not broke in yet - only about 2-3 hours on it, so may not be able to hit full RPM yet)

Anyway once broken in, I plan to try a 4 blade 17p spitfire prop. I expect to lose 1-2 mph in top speed, but I should move up to about 5600-5800RPM WOT and have a much better hole shot and better holding on plane at lower speed. (I typically cruise at about 2,200-2,300 RPM and 23mph and drop off plane if I drop below 20MPH).

Whatever you get, please report back and let us know the differences with whatever prop you go with.

Michael