Tweet
15Hp carb problem solved
In my previous post I was seeking advice on my troublesome 1998 15Hp Yamaha , that I bought from my neighbor for next - to-nothing as he gave up the battle and wasn't prepared to spend any more money on such an old model.
I suspected that it was running way too rich as all the symptoms were there, I.e. excessive smoking, excessive unburnt fuel in the water, and the engine had no power, although it started easily and was idling smoothly. My local outboard mechanic thought it could be dirt or something that was restricting the air flow through the carb, so we gave it another thorough cleanout, but to no avail.. I had already got quotes to replace the complete carb with a brand new one, so the little devil behind my ear said to me, why don't you first stuff this one up completely. So this is what I tried to do: Took my 75W solder iron and soldered up the little hole in the main jet. I then took a needle and made a new, smaller hole though the jet, put the carb back on the engine, back into the water for the ump****th time...... guess what? It took off like a rocket ..... problem solved.
The main jet is #136 and there is no sign of wear or damage. So my next step will be to either order a brand new main jet from the dealers or invest in a good quality fealer gauge to make sure my home-made main jet is up to spec.
I suspected that it was running way too rich as all the symptoms were there, I.e. excessive smoking, excessive unburnt fuel in the water, and the engine had no power, although it started easily and was idling smoothly. My local outboard mechanic thought it could be dirt or something that was restricting the air flow through the carb, so we gave it another thorough cleanout, but to no avail.. I had already got quotes to replace the complete carb with a brand new one, so the little devil behind my ear said to me, why don't you first stuff this one up completely. So this is what I tried to do: Took my 75W solder iron and soldered up the little hole in the main jet. I then took a needle and made a new, smaller hole though the jet, put the carb back on the engine, back into the water for the ump****th time...... guess what? It took off like a rocket ..... problem solved.
The main jet is #136 and there is no sign of wear or damage. So my next step will be to either order a brand new main jet from the dealers or invest in a good quality fealer gauge to make sure my home-made main jet is up to spec.
Comment