My 2006 Tohatsu 9.8- 4 cycle outboard
which has served me well through 2 seasons in the Caribbean
and 3 years in Europe
has just started to run poorly. After cruising the Maine
coast for several months on the US ethanol laced gasoline I noted it started to run worse and worse. Hard starting and poor idle. I installed new spark plugs properly gapped. I added fresh fuel
, with stabilizer, added some carb- fuel
injector cleaner to the fuel. In took off the top of the carb and used spray carb cleaner to flush out all the the accessible passages. After all of this one day driving the dingy at full throttle it just died like it wasn't getting any fuel. I pumped the bulb on the fuel line and it was hard & I was able to restart the motor
but only could keep it running by using partial choke. Using partial choke I was able to get back to the boat.
I removed the carb, and verified the fuel pump
was pumping fuel when the engine
was turned over.
I disassembled the carb completely and inspected and cleaned the main and idle jets. Note, they appeared to be clean when I removed them. I sprayed carb cleaner in every passage
I could find. verified the float and its valve looked proper and was set correctly, I did note what appeared to be corrosion
or brown deposits in the bowl of the carb. I cleaned the inside of the bowl the best I could. I reassembled the carb and re-installed and it starts right up but will only run if I keep it half choked. Note this is one of the EPA certified carbs where there are not adjustable needle valves like in the old days.
Before I replace the carb, any wisdom out there?