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  1. Replies
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    Yes we added a 3/8 spacer, to increase the intake...

    Yes we added a 3/8 spacer, to increase the intake side before the reeds and the results did not show any power gain.
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    Motor still runs great, don’t use it as much, but...

    Motor still runs great, don’t use it as much, but works well during hunting season. As long as you can get the motor up, you should have no problem turning that 16pitch:)
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    1998 3cyl evinrude 50hp MODs

    Hey guys I just got a 1998 3cyl evinrude 50hp and im looking to do some work to it. Where is the best place to start, Itís completely stock?

    Should I get rid of the oil injection?
    Whatís the...
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    What epoxy would you suggest using? Would you put...

    What epoxy would you suggest using? Would you put any matting in with it for strength?
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    I think that's exactly what I am going to do,...

    I think that's exactly what I am going to do, it's easy to work with so shaping should not be a problem. Now my only other problem is where to get a prop for a 15 merc with a 8 spline drive shaft.
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    That's true.

    That's true.
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    I have seen a couple of People do this it looks...

    I have seen a couple of People do this it looks pretty good only problem is I need it to be portable. What I mean is I want to be able to take the motor off and on with only two bolts. I will look...
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    Ya that's what I'm thinking of doing but I rather...

    Ya that's what I'm thinking of doing but I rather have the pickup under the nose so I get max pressure. Has anyone tried this because people say it won't work but I was told it should have know...
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    Your definitely right I I'm well below speed to...

    Your definitely right I I'm well below speed to need a nose cone but with my current lower unit I can't jack it any more or I run out of water. I really want it for the low water pickup.
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    I think its older than That, It's an 8 spline...

    I think its older than That, It's an 8 spline shaft 2:1 gear ratio. I want a low profile gear case, and can't find one anywhere that would be easy to adapt to a evinrude. I don't think there are any...
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    Sounds good, how is it standing up have you...

    Sounds good, how is it standing up have you tested yet? do you have any pictures? Thanks
  12. Replies
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    It's old not sure of the year, I think it's a 9.9...

    It's old not sure of the year, I think it's a 9.9 to 15hp gear case and I'm hoping to put it on my evinrude 20big block. How easily do they brake and is there a fix?
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    Where to get a nose cone for 2in lower uint

    Hello I am looking for a small nose cone/low water pickup for a mercury 9.9 lower unit the hub size is 2.25in so want something small and not to bulky. Any help would be good.
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    thanks for the help I have looked at all...

    thanks for the help I have looked at all different types of mods. but the more and more I think of it I would still like reverse so maybe get a 6hp or 9.9 evinrude and convert it to fit my 20hp...
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    Evinrude race lower unit

    I'm looking for a race lower unit for a 20hp evinrude any one have one for sale or know where I can get one?
  16. Replies
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    Hey thanks for the tip, I ended up buying a...

    Hey thanks for the tip, I ended up buying a no-rev limiter from CDI. installed it this weekend and it worked great hopefully some more runs this weekend. Thanks everyone for your help.
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    The reason I want to go past the rev limiter is...

    The reason I want to go past the rev limiter is because I just bought an 18pitch cleaver and am already hitting the rev limiter with it and I don't want to buy another prop so soon. Started with a 13...
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    Thanks I might try that this weekend, a new cdi...

    Thanks I might try that this weekend, a new cdi is about 150-200$ to get it shipped to canada so if there is a cheaper way like cutting a wire, I'm all for it.
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    I could go out and by a non rev-limiter for...

    I could go out and by a non rev-limiter for 150-200$ but just wanted to know if there was a cheaper way. There has to be something or someone that can shed some more light on this.
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    By Passing the Rev-limiter

    Hey just wanted to know if any one can help answer this question, can I by pass my rev-limiter in my 1990 20hp evinrude?

    Rev-limiter cuts in at 6100 rpms can I can't I wire or disconnect...
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    yea it is a really nice feature to be able to...

    yea it is a really nice feature to be able to switch on the fly, I have never been able to completely block the exhaust form going to the prop, so would not be able to answer that question for you...
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    Hey I run the exhaust above the water and below...

    Hey I run the exhaust above the water and below on a 20hp evinrude running a 18pitch cleaver over hub and it makes no difference on acceleration. yet I don't have the exhaust completely cut off from...
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    Tested the motor this weekend ran a 41.2 mph, had...

    Tested the motor this weekend ran a 41.2 mph, had it jacked all the way up and still had great water pressure so maybe put a shim or move the jack plate up an inch. We reached our goal so thanks...
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    Ron Hill made the prop

    Ron Hill made the prop
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    I did not end up buying the stacks. I wanted to,...

    I did not end up buying the stacks. I wanted to, but I run this motor every weekend and would probably get shot for being to loud LOL people already think I am to loud. on the weekend we did a little...
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    Update on how it is going Got the new prop last...

    Update on how it is going
    Got the new prop last week 11x18 over hub cleaver, going to do some runs this weekend hopping for 40mph "so close". running a 5in jack plate really helps any other tips...
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    My motor is a 1990 evinrude 20hp model# e20cresb

    My motor is a 1990 evinrude 20hp model# e20cresb
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    I would definitely like to get a set of stack ,...

    I would definitely like to get a set of stack , just to have LOL. Just out of curiosity what props and rpms were you guys running.
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    That's crazy fast for a 20, did u run low water...

    That's crazy fast for a 20, did u run low water pickups or just stock lower units? Where did you guys get ur stacks?
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    We will definitely try raising the motor a little...

    We will definitely try raising the motor a little more but im sure we are pushing the limit with that prop right now so your probably right we will start slipping. What kinds of speed were you seeing...
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    hopefully we can finish it this week so we can...

    hopefully we can finish it this week so we can test it on the weekend, just have a couple of more things to do before we mount it and wire it.
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    Hey guys sorry it took so long to get back. Just...

    Hey guys sorry it took so long to get back. Just tested the motor with a stock tuner and ran 37.5mph at 6140RPMs not much difference but with the out side air temp only getting warmer the test held...
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    we were surprised with the 3mph gain and quite...

    we were surprised with the 3mph gain and quite happy. we are always keeping a good eye on our water pressure don't want to over heat the motor, and I agree with you maybe a little more and we will be...
  34. Replies
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    I agree with you, before we buy a prop we are...

    I agree with you, before we buy a prop we are going to get a jack plate and maybe a trim and tilt, we want to get the best out of this prop before switching props if we hit 6200rpms then that's are...
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    That's what our tac and the GPSs said. I was very...

    That's what our tac and the GPSs said. I was very impressed with our results this weekend now just looking for a new prop and a stock tuner to test.
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    Hey everyone thanks for all your help so far. ...

    Hey everyone thanks for all your help so far.

    So we took the boat out this weekend and raised the motor (almost 4 inches) and added a little more tilt. our best was 37.2 mph GPS with me (130lb)...
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    I will check are compression ratio I know it's...

    I will check are compression ratio I know it's 147psi top and bottom 153psi. We run premium fuel but it 94octane. We have about 1 millimetre clearance. We did not rock the top of the piston, we just...
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    Thanks for the tips with the prop, I will check...

    Thanks for the tips with the prop, I will check the rev limiter tomorrow. Where do you get as non rev limiter?
    Is there anything else you do to get your boats into the 40+ mph what prop would you...
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    Where would you find a non rev limiter powerpack...

    Where would you find a non rev limiter powerpack for this engine? Because I think your right, that it won't rev past 6200.
    We did not get a base line reading before, might have to get a stock tuner...
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    Thank you we shaved 30 thousands of an inch and...

    Thank you
    we shaved 30 thousands of an inch and packed the head to get our compression around 150psi.
    To start off we use a blue point timing light to measure our RPMs which is very accurate so...
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    Best Prop for Evinrude 20HP Mod

    I own a 20hp evinrude I am looking for a new prop Any suggestions ? I spin a OMC 10-13 aluminum prop at 6200-6300 RPM 33mph and a solas stainless steel prop 10-15 at 5600-5700 at 34mph. I want a...
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    I moved the motor up an inch with a block of wood...

    I moved the motor up an inch with a block of wood and it would blow out on turns and off the blocks if I full Throttled it quickly, so I removed it. This was with the stainless steel prop.
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    Evinrude 31.8ci Mod Advice

    I posted a form a couple of months ago asking for peoples info on mods to a evinrude 31.8 cubic inch. over the winter we did some modifying, and were a little surprised with our results. we thought...
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    On the exhaust side on the middle port there is a...

    On the exhaust side on the middle port there is a cut about a 1/4 inch above the exhaust port and 1/8 inch deep. They call it a relief cut and I think JohnsonM50 is right it's for easy starting.
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    Do you guys have a relief cut in the side of your...

    Do you guys have a relief cut in the side of your cylinder wall or is that just something they did on the 20hp or is it on all the 31.8cid 20,25,30,35hp.
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    Smokin' Joe i tryed to PM you but said your...

    Smokin' Joe i tryed to PM you but said your message box was full or somthing so.
    I would be interested in the stiletto prop how much $$ are you looking to get for it and is it for the 14 splined...
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    JohnsonM50 what kind of compression do you get...

    JohnsonM50 what kind of compression do you get with that performance head?

    The aluminum sticks a little to the water but not bad. I have played around with the weight in the boat and trimming it...
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    Ya I have been looking for one for a while and...

    Ya I have been looking for one for a while and have not seen one. My rig weighs 275-300 lb boat alone with engine and gas tank 450 lb. 13x10 pitch aluminum OMC prop 32mph @ 6200RPM ( I can put 5...
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    I am running this engine on a 14 foot aluminum...

    I am running this engine on a 14 foot aluminum princecraft. I am currently in the Process of porting so I do not have any pictures. I am looking for a high compression head at the moment but can't...
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    Ya your correct its a crossflow engine. I will...

    Ya your correct its a crossflow engine. I will try to get some pictures up tonight.
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