Weldorthemagnificent said:Probably work fine if it's just one guy. I have a 16' and run a 10x13 which revs right out if I'm alone which is seldom and will still get on plane with 3 guys and gear.
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Pappy said:Rather see a 13 on it than a 15. Will be a better all around prop for you with varying loads.
RaisedByWolves said:Im looking into putting a 35hp carb on my 25 evinrude and Im finding there is more to it than just the carb.
For my motor I need to add the correct reed box/intake and possibly the tuner inside the leg.
Your RPMs are limited (6200?/6500?)so once you get it tuned to where you are hitting the limiter you then need to go up one size (2") pitch on the prop.
Do you have a way to monitor RPM?
How deep is your motor sitting?
And last, where did you find the carb?
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I have a tach on order , I believe the RPM max for my 2005 25HP is 5500 , My engine plate sits flush with bottom of boat .Bought the carb from Dusky Marine online down in FL $275 ,they had 8 on the shelf. I cross referenced my 25HP to the 30HP same intake and reeds.
RaisedByWolves said:Im looking into putting a 35hp carb on my 25 evinrude and Im finding there is more to it than just the carb.
For my motor I need to add the correct reed box/intake and possibly the tuner inside the leg.
Your RPMs are limited (6200?/6500?)so once you get it tuned to where you are hitting the limiter you then need to go up one size (2") pitch on the prop.
Do you have a way to monitor RPM?
How deep is your motor sitting?
And last, where did you find the carb?
1648grizz said:I have a tach on order , I believe the RPM max for my 2005 25HP is 5500 , My engine plate sits flush with bottom of boat .Bought the carb from Dusky Marine online down in FL $275 ,they had 8 on the shelf. I cross referenced my 25HP to the 30HP same intake and reeds.
My 25HP is a 2005, the last year for the 25HP 2 stroke Johnson I believe. I definitely got a better hole shot, the bay was choppy so top end could have been better. I'll be out tomorrow in the creek to get a better top speed test with both props. As far as max RPM I'll know tomorrow as I have a tach now.RaisedByWolves said:RaisedByWolves said:Im looking into putting a 35hp carb on my 25 evinrude and Im finding there is more to it than just the carb.
For my motor I need to add the correct reed box/intake and possibly the tuner inside the leg.
Your RPMs are limited (6200?/6500?)so once you get it tuned to where you are hitting the limiter you then need to go up one size (2") pitch on the prop.
Do you have a way to monitor RPM?
How deep is your motor sitting?
And last, where did you find the carb?1648grizz said:I have a tach on order , I believe the RPM max for my 2005 25HP is 5500 , My engine plate sits flush with bottom of boat .Bought the carb from Dusky Marine online down in FL $275 ,they had 8 on the shelf. I cross referenced my 25HP to the 30HP same intake and reeds.
8 on the shelf is good, $275 each? Ooof! :shock:
Is that a 30hp carb or a 35hp?
Ill have to look it up again, but on another forum there is talk about two different ignition power packs, one limiting rpm to 6200 and the other having no limit.
Is there a number on the side of yours?
The 6200 should have that number on the outside of it somewhere so maybe the 5500 does also.
RPM is going to be the key to going faster.
Weldorthemagnificent said:It takes roughly twice the horsepower to go half again as fast so don't expect huge gains. I went from a 25 to a 35 (1983 so powerhead HP) and top speed with a 13 pitch prop is very close. What it does do is come out of the hole like jack the bear and will even get up on plane with 3 big boys and all the camping gear we can pile on. If you want to pick up more jam, look for a Nissan/Tohatsu m40c or a Yamaha/mariner 2cyl 40. Both are light weight for a 40 and good reliable motors.
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How much top end did you gain with the carb swap ? I didn't check top end before the swap but when boat was new I hit 29 to 30 mphMatt193 said:I have the same setup as you; a 30 HP carb on a 25 HP motor on my 16' Sylvan Sport Troller. I can get 30-31 with a good stainless 13p prop but 28-29 mph with various aluminum ones. I have a 30 HP intake that I need to install and also swap out the throttle cam off of a 35 that we use for parts to see if that makes any difference and then I might be able to pull a 14p or 15p prop.
Right now I'm running into a lean spot at about 3000 RPM which is annoying and I'm hoping one of those two items solves it.
I don't know what the difference is between the 25 and 30/35 cam. I'm assuming the profile might be slightly different, which I'm hoping to find out as soon as I get a spare minute to go over and pull it from the junker.
I also might try a set of CCMS reeds, but I don't want to start modding until I get the motor running correctly stock.
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