Join Date: Jul 2000
Thanked 331 Times in 315 Posts
Rep Power: 21
Re: 6hp Tohatsu, starts and idles fine, stalls out in gear
Remedy is simple ..... mark how many turns 'in' for all jets. disassemble the carb and use carb cleaner, precisely reinstall all jets to the previously made marks.
Next time when putting the OB away for storage for more than 2 months, run completely dry, drain the carb bowl, fill/flush the empty bowl with isopropyl alcohol -IPA (use a large syringe to load the bowl with IPA)
The carb on the Tohatsu 4,5 & 6 HP. has an extremely fine orfice in the idle trim adjusting jet which EASILY forms gum and varnish when the carb 'dries out' during long term storage.
Even if you use a stabilizer and store the OB for more than a month or two - seal the VENT on the carb bowl body to prevent evaporation of the gasoline to help prevent gum and varnish formation when the gasoline 'vaporizes' out through the carb bowl VENT (and again, even if you use 'stabilizers' in the fuel).
Best is to always run dry and then 'dump' the bowl via the drain plug; the IPA 'wash' will remove any 'already started' gum/varnish formation in the jets and orfices ... and in the bowl. A cleaned and dry carb bowl won't form gums, etc.; nor will have any 'phase-separated' fuel.
If you think you're having 'fun' now with 10% ethanolated gasoline, just wait until the newly mandated 15% EtOH gasoline 'hits' your OB.
Last edited by RichH; 04-26-2017 at 01:27 AM.