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Max Online: 36273 @ 01/23/13 02:34 PM
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#12197221 - 04/13/17 08:27 AM Rough idle good higher rpm
Dawson Hefner Offline
Extreme Angler

Registered: 09/10/09
Posts: 2825
Loc: Brownsboro, Tx
Engine is 2005 Yamaha 115hp Tlrd carbed 2 stroke.

Hard to start, will not stay running at low idle. It is running rough at low idle. Pulled all plugs last night, they are wet. Runs fine at higher rpms.
Have to pump fuel bulb and choke every time with neutral idle advanced. Possible it don't need bulb pumped every start but choke and idle for sure. Sat most of winter, I had water in fuel in such this spring. Went though carbs, fuel system etc.

It has new fuel lines, new factory primer bulb, cleaned drained and dried gas tanks, new fuel lift pump last year. New plugs last year.

Where should I look first at resolving this?
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www.texasmegafishadventures.com for guided rod and reel alligator gar angling
Licensed Guide Dawson Hefner
903-721-4296

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#12198975 - 04/14/17 06:57 AM Re: Rough idle good higher rpm [Re: Dawson Hefner]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11095
Loc: Littlefield Tx & Lake A. H. US...
Sounds like you still have a carb that the needle and seat is leaking or the float is not adjusted correctly.
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�The world will not be destroyed by those who do evil, but by those who watch them without doing anything� Remember what He has done and remember that He is not done yet! GOD IS GOOD

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#12199089 - 04/14/17 08:07 AM Re: Rough idle good higher rpm [Re: Dawson Hefner]
crapicat Offline
TFF Celebrity

Registered: 01/23/13
Posts: 5412
Loc: Grandview, TX
Not a boat repair guy, but over the years when I have this problem, I just throw a few lines over the side of the boat and slow troll some crank baits with the big motor for a tank or so, and it will normally straighten out (not always.) The fast method is to take it good mechanic (who is not stacked up for several weeks) and have the carbs rebuilt. In fact, as a matter of course, I set aside time early in the year to slow troll the big motor so I dont need to take it in for carb work. You can add a can of seafoam in the tank and top off the tank (if you failed to run the tank empty before storing it.) to speed up the process...Hope this information helps.

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#12199439 - 04/14/17 11:41 AM Re: Rough idle good higher rpm [Re: Dawson Hefner]
Dawson Hefner Offline
Extreme Angler

Registered: 09/10/09
Posts: 2825
Loc: Brownsboro, Tx
Alright I'll pull carbs again, I was suspicious of it being something with them still
_________________________

www.texasmegafishadventures.com for guided rod and reel alligator gar angling
Licensed Guide Dawson Hefner
903-721-4296

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#12200074 - 04/14/17 09:07 PM Re: Rough idle good higher rpm [Re: Dawson Hefner]
Dawson Hefner Offline
Extreme Angler

Registered: 09/10/09
Posts: 2825
Loc: Brownsboro, Tx
Went through carbs, clean, blow out with compressed air. Started on hose easy, will try with pressure on it tomorrow.
_________________________

www.texasmegafishadventures.com for guided rod and reel alligator gar angling
Licensed Guide Dawson Hefner
903-721-4296

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#12204522 - 04/18/17 08:01 AM Re: Rough idle good higher rpm [Re: Dawson Hefner]
texasbassdude Offline
Outdoorsman

Registered: 05/31/08
Posts: 112
Loc: Bulverde, TX
How'd it go?

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#12204935 - 04/18/17 11:15 AM Re: Rough idle good higher rpm [Re: Dawson Hefner]
Dawson Hefner Offline
Extreme Angler

Registered: 09/10/09
Posts: 2825
Loc: Brownsboro, Tx
Seems fine, will run it this evening or tomorrow on lake.
_________________________

www.texasmegafishadventures.com for guided rod and reel alligator gar angling
Licensed Guide Dawson Hefner
903-721-4296

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#12207791 - 04/19/17 09:07 PM Re: Rough idle good higher rpm [Re: Dawson Hefner]
Dawson Hefner Offline
Extreme Angler

Registered: 09/10/09
Posts: 2825
Loc: Brownsboro, Tx
Ran good at the lake today, started easily. I pulled and cleaned carbs and checked floats, one was out of spec rest ok. I never found anything stopped up but it's running good now so sometging was off in there. Hopefully I'll be able to get back to running trips and fishing this year last two years been full of a lot of big life events.
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www.texasmegafishadventures.com for guided rod and reel alligator gar angling
Licensed Guide Dawson Hefner
903-721-4296

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#12208601 - 04/20/17 11:54 AM Re: Rough idle good higher rpm [Re: Dawson Hefner]
Stump jumper Offline
TFF Celebrity

Registered: 04/19/04
Posts: 7489
Loc: Rockwall
Was the float high? Not sure about Yammies but know my Black Max runs better a little lean rather than rich.

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#12210508 - 04/21/17 03:45 PM Re: Rough idle good higher rpm [Re: Dawson Hefner]
Dawson Hefner Offline
Extreme Angler

Registered: 09/10/09
Posts: 2825
Loc: Brownsboro, Tx
Yeah, I guess the last time I took them apart I got rough with it? Not really sure but I've checked them before and they were all the same. Nobody else has been in it.
_________________________

www.texasmegafishadventures.com for guided rod and reel alligator gar angling
Licensed Guide Dawson Hefner
903-721-4296

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