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  1. Replies
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    Get the reeds. Check to see if your cdi box has...

    Get the reeds.
    Check to see if your cdi box has a rev limiter. Get one without.
    Put the rest of your money in a tachometer and gps so you can see what gains or losses you are making.
    Start...
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    Nice horns, speedfreak. I found a 35 power head....

    Nice horns, speedfreak. I found a 35 power head. I measured the ports. The transfers and fingers are the same on both motors. The exhaust is 0.070” higher on the 35hp.
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    I have been working on the lower unit. Here are...

    I have been working on the lower unit. Here are some pics.
    I blocked off the exhaust passage at the cav plate. Now the exhaust will exit above the cav plate instead of through the hub. I used some...
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    Some of the aftermarket gaskets seem to be...

    Some of the aftermarket gaskets seem to be thinner by up to 0.01” compared to an oem gasket. You can always make a copper sheet gasket or plane the head. Here is a vid of how I plane the OMC 31.8...
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    I will be blocking off the stock water pickup in...

    I will be blocking off the stock water pickup in the lower unit and adding holes at the front as I have done on my two cylinder. 72508
    Or I may block off the back of the carrier and have water inlet...
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    I am making some modifications to the lower unit...

    I am making some modifications to the lower unit as well. I may have the exhaust exit above the cavitation plate as I have done on a two cylinder motor.
    72504
    I will also be blocking off the stock...
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    I have pulled the sleeves out of the block to...

    I have pulled the sleeves out of the block to make it easier to massage the ports. The glue lines from the lost foam process, obstruct the flow as nerstrom pointed out in another thread. I will...
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    Got the midsection welded and ground today. I am...

    Got the midsection welded and ground today. I am not going to use the stock lower cowl, so I ground off a lot of extra material.
    72433
    72432
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    No it’s not an etec. It is a 1996-2001 evinrude...

    No it’s not an etec. It is a 1996-2001 evinrude 25hp 3 cylinder.

    That’s great information, thank you. I am concerned about what the reduction in volume will do to the exhaust tuning. I have not...
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    20,25,30 and 35hp mods

    I know there are already some threads on here about modifying 20-35hp outboards. Just thought I would start a new one.

    Here are some pics of a Johnson/Evinrude 3 cylinder 25/35hp I am modifying....
  11. I too bought one of these heads after reading on...

    I too bought one of these heads after reading on here about the extra compression. I did a compression test on my stock 1994 30hp and got 118psi in both cylinders. I put the 1982 head on and sadly...
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    Here are a couple of heads I have. The top heade...

    Here are a couple of heads I have. The top heade is from a 1982 30hp. The bottom is from a 1988 30hp.
    When I started with the 1982 head, I got 115psi compression. The other head had 120psi...
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    68337Here is a pic of my test wheel. 6650rpm is...

    68337Here is a pic of my test wheel. 6650rpm is at the ramp with the cab plate fully submerged.
    Running in a small drum may have a different effect. Or maybe you have a very powerful motor.
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    Has anyone used a factory test wheel to test...

    Has anyone used a factory test wheel to test their motors after modifying?
    I have wiseco 0.030” pistons in mine and a planed head. 30 deg btc and turn the test wheel 6650rpm.
    On my boat with a...
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