Jetting a 25hp Suzuki

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greenhead1984

Seaman Apprentice
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Feb 4, 2008
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I've got the option of rejetting my main jets for a 99 suzuki 3 cylinder dt25c with either sizes 130, 140, or 150. Right now the jetting is 105 for the top carb, 102.5 for the middle carb, and 130 for the bottom carb. I'm trying to increase top speed and was wondering if by rejetting the main jet I could accomplish this?
Thanks
 
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greenhead1984

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Feb 4, 2008
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Re: Jetting a 25hp Suzuki

Is this the best combination ya think? Is it 130 top, 130 middle, and 140 bottom?
Thanks
J
 
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greenhead1984

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Re: Jetting a 25hp Suzuki

Didn't work for me, actually slowed me down. Maybe I can find another fix
 
deejaycee_2000

deejaycee_2000

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Re: Jetting a 25hp Suzuki

that is strange, you should achieve at least 800 rpm more ...... that is the jets that i run allthough my motor is fully modified adn runs on AVgas ..... I get 47mph out of mine (30hp suzuki) ..... you can also change the reeds to boyessen reeds, also replace your gearbox oil with synthetic ATF .......that alone will give you much more RPM .....
 
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greenhead1984

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Feb 4, 2008
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Re: Jetting a 25hp Suzuki

I went down and picked up those jets from the store, when I ran them, it just seemed like it was missing and just running crappy. It definitely wasn't running as smooth as it was with the original jets. Did you change the pilot jets on your 30hp?

This is a 99 25hp, I don't know if it makes a difference but I noticed that it doesn't have a pilot adjustment screw in the bottom carb and also has small brass jets behind the outer choke butterflys on all 3 carbs. I'd heard that the 98 and newer 25's only use the bottom carb for high end rpm, not low end (a computer change).
 
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DGRAY1

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Jan 27, 2011
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Re: Jetting a 25hp Suzuki

@ greenhead I got a99 dt25c stock what can I do to it for more sped that's fairly cheap and how fast u think I can get out of it thinks
 
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