tohatsu 3.5 won't run without choking - Page 2 - SailNet Community
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post #11 of 65 Old 03-03-2008 Thread Starter
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Hi,
Thanks for the responses!
No wheezing. After I throttle up, it sounds like it is starving for gas.
It was only a few weeks between runnings, so gas was good. Vent was open
I did visually verify operation of the choke/throttle yesterday, so that's not it. New plug/oil/fuel yesterday -- same problem.

The outside of the carb has a small amount of varnish(likely from old spillage), but not much. The (new) plug was very slightly darkened after a few minutes of running, but not fouled or burned, so that looks OK.

Disassembling the carb is likely in my future. I'll let you know what I find! If I do destroy the gaskets, any recommendation on where to order replacements?
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post #12 of 65 Old 03-03-2008
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post #13 of 65 Old 03-03-2008
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You have a 99.99% chance of the carburetor orifices being clogged up. You will have to remove the carburetor and disassemble it before dipping the body and metal parts in carburetor cleaner. Under no circumstances can you place the plastic, rubber or fiber parts in cleaner as that will either dissolve them or cause them to swell. Any Nissan, Tohatsu or Mercury dealer has parts for this model engine.

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post #14 of 65 Old 03-03-2008
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My last two outboards have been Nissan and Tohatsu, both made by Tohatsu. They have been absolutely great in starting. The only time I had any problems was when I used "old" fuel--three months old. Went to the fresh stuff, and it fired right up. Make sure your gas is new!

Hud
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post #15 of 65 Old 03-03-2008
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You say the fuel flow is good. I'd change the fuel filter anyway. Don't ask me how I know this.

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post #16 of 65 Old 03-18-2008 Thread Starter
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fixed!

Well, as suspected it was a piece of gunk clogging the jet inside of the bowl. All cleaned and runs great.

The wirewrap wire was a tool that worked great too.

Thanks for the advice!
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post #17 of 65 Old 03-19-2008
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Thanks for the follow up report. It is always good to know if diagnosis and suggested fixes pan out. Glad yer back up and running!

No longer posting. Reach me by PM!
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post #18 of 65 Old 03-20-2008
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Does it have a fuel pump? My 15 hp Nissan was doing that and it turned out to be the fuel pump, Which is a rubber sheet with one side being connected to the crankcase (making it flutter as the engine runs) and the other side having a set of one way valves. There was a leak around the sheet and it wasn't sealed to the crankcase and didn't flutter. Took it apart put some gasket sealer around the edge, put it back together, and boom it worked.
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post #19 of 65 Old 03-20-2008
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Jshep and all:

As Chuckles pointed out there is a real problem with E85 and your dink motor.

My Merc is 2 years old and wouldn't run without the choke. Had to have the carb rebuilt and the mech said "let me guess....you fill up a 5 gall tank in your dink and it sits there all season." Yup. Well the ethanol causes the gas to separate as it just sits around and this was contaminating my carb. He suggested only using .5 to a gallon at a time. More trips to the gas station but fewer trips to see him!
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post #20 of 65 Old 03-22-2008
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Running the engine dry (ie disconnecting the fuel line, or shutting off the fuel valve) would also probably help in preventing the carb from getting clogged. I have a couple two cycle engines, and I try to shut them off by cutting off the fuel supply, instead of turning the on/off switch. Especially if I know the engine is going to sit awhile without use.

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