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    Mercury 9.9 four stroke rpm questions

    Thank you so much for the suggestions. Finally ordered a 6.5 pitch prop and took it out for a run this evening. Boat went from 4100rpms 7 mph to 5700 rpms and 11mph with 2 people and ran 13.2 by myself. Still may try a hydrofoil to help lift the rear a bit but night and day difference between...
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    Jack plate on a 9.9

    Right now it is about .5 inch high and 4 and 3/8" of set back. I just finished it a couple weeks ago and I believe I am having carb/fuel issues so have not got it back out since cleaning some crud out of my carb. I will be going out Saturday am to run again. My problem on the test run of the...
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    Jack plate on a 9.9

    This is the one I built. Not slotted because I didn't have access to the mill the weekend I built it. I just have holes every 1 Inch and holes ever .5 inch on the jackplate for the motor bolts.
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    Mercury 9.9 four stroke rpm questions

    Thanks for the heads up John. I'll try to change it up in the next couple weeks.
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    Mercury 9.9 four stroke rpm questions

    Ya I know pappy. I'm saying I wish I would've bought an older 2 stroke or a 15hp 4 stroke and re decal to push boat a little better
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    Mercury 9.9 four stroke rpm questions

    Ya I've tried all positions and right now I'm wishing I would've gone 2 stroke but the reliability of this 4 stroke is what I wanted since mainly this boat is only used for restricted HP lakes. This year has been a real bad year for rain and snow run off so some of our local lakes are beginning...
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    Mercury 9.9 four stroke rpm questions

    Thanks pappy. I may not have time to get the little boat this week due to taking the big boat camping this weekend. I'll definitely empty the boat and load bare minimum and try again next week and test with everything else loaded in the front.
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    Mercury 9.9 four stroke rpm questions

    On the lowest trim setting it sits about 1 Inch low but when the motor is trimmed out to be horizontal to the bottom of the hull, the anti cavitation plate is level with the hull. The boat does have a floor installed with thin marine vinyl over the top of 5/16 or so ply wood.
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    Mercury 9.9 four stroke rpm questions

    I have a jackplate because my transom is slightly longer than a short shaft and slightly shorter than a long shaft. This is what the stern looks like with fuel tank me and fire extinguisher loaded at the rear of the boat. All other weight is loaded between middle and front seats
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    Mercury 9.9 four stroke rpm questions

    I habe tried the trim in each position and I have moved weight around throughout the boat. The only thing I have not done is run it with bare minimum gear, extinguisher, pfd paddle and throwable. I'm starting to believe that the rpms are low because it won't get out of the hole and onto plane...
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    Mercury 9.9 four stroke rpm questions

    I will try to run it with bare minimum this week if I get a chance. I have not thought about using a hydrofoil but that could possibly help me.
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    Mercury 9.9 four stroke rpm questions

    It feels like it is just about to plane out but will not get the rest of the way. I had shifted weight around quite a bit yesterday and also tried it alone sitting from the back of the boat up to the front seat. It did climb rpms but I couldn't see my tach from the front seat
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    Mercury 9.9 four stroke rpm questions

    I had posted about my motor height a few weeks back. Finally got around to building a jackplate to get my motor up to the correct height. It is a 2013 4 stroke 9.9ml on a Lowe 1467wt. Boat weights roughly 750lbs fully loaded with 2 people. I think i can bring the motor up 1 more inch judging by...
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    Another motor height thread..

    Thanks for the info. Heading to the lake for the weekend right now. Gonna do some actual testing then find a jackplate in the next couple weeks.
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    Another motor height thread..

    So I just measured the transom this morning. It is right at 18.5 inches. Even though it is a clamp on, I only have about 1 Inch to safely raise it. I think I'll have to throw a jackplate on it here pretty soon to get it up the 4 inches or so it needs. Thanks for the picture for motor lengths.
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