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PostPosted: 24 Oct 2015, 07:57 
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Joined: 10 Sep 2011, 08:35
Posts: 23
Does anyone change the plastic timing cam when making the 25 to 30 conversion. Another post indicated they are different, even though the parts breakdowns show the same number for both models. I ordered the part quoted and they are indeed different, and it seems the 30 hp cam does not advance as quickly as the 25. I will look for the part number if anyone is interested.



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Dave A.

14 ft Rhino w/25/30 upgrade
12 ft 1950's Thompson custom w/18 Fast Twin
2 Canoes
27 ft Hunter Sailboat
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PostPosted: 26 Oct 2015, 03:30 
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Joined: 25 Feb 2011, 09:23
Posts: 243
Location: Virginia, USA
Edstrossner,
I've read your posts with interest, as far as opening up the throats to give the motor more lung capacity, and as far as shaving heads, to increase compression.

But what did you do as far as getting more fuel mixture into the increased airflow? Perhaps, it's as simple as going up a main jet size or two?

Probably a silly thought, but one that is inexpensive to try. You never know, maybe it will work?

-TH



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Boats:
1998 Crestliner 1650 Fish Hawk (Current Project Boat)
1995 Princecraft 16 - "Starfish 20", Evinrude 35 HP
1997 Wellcraft 24 W/A, Evinrude 200 HP Ficht
1994 Offshore CC Bay Boat, 22' - Evinrude 115 HP
1967 Ski Barge 19 C.C, 1992 Evinrude 70 HP
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PostPosted: 12 Apr 2016, 17:30 
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Joined: 27 Mar 2016, 10:13
Posts: 26
Location: Birmingham, AL
I have a 1989 Evenrude tracker 20 hp that I am prepping for this upgrade. I know that yours is a 1988 but are the same parts compatible. I have read conflicting information regrading this part interchangeability. I read the thread and understand that I will also potentially be in need of a intake, I just want to make dang sure before I start ordering parts. I did notice a color scheme difference between your 1988 and my 1989. Mine is just like the one in the video that I am linking to this post (except mine is a 20 hp of course). I appreciate any help and advise that can be passed in advance. ~Billy

https://www.youtube.com/watch?v=xmckQll ... tml5=False



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1990 Tracker Guide V14
1989 EVenrude 20 HP long shaft Tiller - Soon to have the upgrade HP mod to 30/35 :D :USA1:
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PostPosted: 08 Jan 2019, 17:20 

Joined: 06 Jan 2019, 19:37
Posts: 2
I was led to this thread by way of google so this is my first post. I am not sure if anyone is following it anymore but I hope so. I have a 1990 Evinrude 20 hp (E20CRESB). From reading through a lot of these posts it seems I should be able to do this conversion. I know I can bore out the hole in the intake to make it a 25hp but I want to convert it to the 30hp. How do I go about figuring out the part numbers for the intake and the carb? I think that is the only two things I need to buy. When I look up a 1990 30 hp, there are several model numbers.

Any help would be much appreciated.


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PostPosted: 12 Jan 2019, 05:13 

Joined: 04 Feb 2013, 22:11
Posts: 435
Well if you googled the original question I would have thought you would have tried a search here for your second one, you would have found it has been asked numerous times with usually the same success. You will most likely have to just dig around to you find them quite honestly. There are a couple old threads here with various numbers that will work depending on model.


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PostPosted: 14 Jan 2019, 15:08 
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Joined: 17 Apr 2014, 15:39
Posts: 580
Location: Cullman, Alabama
Interesting that this thread got bumped as I was just looking at it last week. Guy locally is selling a set of a 35hp carb and intake for $50 and has two sets. I was thinking about buying both so I could try this out if I ever get the correct model motor to try it on. Then maybe selling the other one on here. Anyone know what the going rate of the carb and intake manifold would be?



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2016 Alumacraft 1648 NCS - 1992 Johnson 9.9 HP Tiller
http://www.tinboats.net/forum/viewtopic.php?f=21&t=40764
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PostPosted: 15 Jan 2019, 18:00 

Joined: 06 Jan 2019, 19:37
Posts: 2
nccatfisher wrote:
Well if you googled the original question I would have thought you would have tried a search here for your second one, you would have found it has been asked numerous times with usually the same success. You will most likely have to just dig around to you find them quite honestly. There are a couple old threads here with various numbers that will work depending on model.

Well I did a search before I posted here and again after and I have not found any carb numbers or a thread that would tell me how to figure it out. I am sure it is how I am searching for it with my key words. I did find a member that did his 1990 motor and sent him a PM but his post is from 2014 so probably a long shot.


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