I bought a new Merc 3.5 hp 4 stroke
in 2010 and it never did run right. I finally bought a new carburetor (for over $200) and it ran like a champ! The new carburetor was a different design than the original. I hated to spend the money
, but it was much less than a new motor
. I also put a very small in-line fuel filter
between the shutoff valve and the carburetor. The fuel
strainer in the fuel
line is next to worthless. Both Yamaha and Honda
have the very small fuel filters.