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Hi, my name is Jon and I am addicted to Fishing...
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Discussion Starter · #1 ·
I have a 2000 Suzuki DF25 4-stroke with an idling issue. It seems that when I start it up it idles perfectly until it heats up at about 3-5 mins. It then starts to idle very rough. I give it gas and it smooths out and no issues running, just at base idle it sputters. Sounds almost like an ignition issue. I pulled the plugs and they are clean. Any suggestions?
 

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When cold it idles ok. Cold means the automatic choke is activated.
After 3 to 5 minutes, after it warms up, it starts to get rough,
that's when the choke is opening back up.
I'd want to hook up a tachometer, so after it warms up, I could determine the idle rpm's.
Too low an idle setting leads to sputtering and stalling.
Especially on the water, when back pressure from the submerged exhaust is greater.
 

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Hi, my name is Jon and I am addicted to Fishing...
Joined
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125 Posts
Discussion Starter · #3 ·
So there is an automatic choke and a manual choke? i pull the manual one when starting and then push it back in once it starts. <--sorry for the newb question, wanna learn all about the new motor
 

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I'm going from memory, but I believe the 25 Suzuki also
has an electronically controlled choke, I think they call it
an enrichment system. That the problem occurs after warm up
is what made me think your idle setting may be too low.
That's what you get for an opinion, made without actually having seen/heard the outboard.

:D
 

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Hi, my name is Jon and I am addicted to Fishing...
Joined
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125 Posts
Discussion Starter · #5 ·
Yeah, I think you'd have to hear it for yourself. If I rev it up slow it continues to sputter roughly until it gets to a certain unknown rpm then smooths out. I'm cornfused! ;D
 
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