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oil mix ratio on older mercury

Discussion in 'Boats and Motors' started by Fish4Fun, May 8, 2004.

  1. Fish4Fun

    Fish4Fun Relaxing.

    anyone know what the mix ratio is on an older Mercury 20hp electric start
    serial # 5730301
     
  2. DaleM

    DaleM Original OGF Staff Member

    My 73 Merc. 10 hp. is 50-1. They have been that way for a long time. PM Lakeraider, he's our resident Merc. expert.
     

  3. LakeRaider

    LakeRaider EEEEEK!

    The 7 digit serial numbers started in 1956, which would have been the Mark series. Being your motor is a 50-series serial# I'd say it is a very late 1978 or early 1979. That would make the mix 50:1 :cool: Raider<><>
     
    Last edited by a moderator: Apr 30, 2015
  4. LakeRaider

    LakeRaider EEEEEK!

    I might have missed on the year. It looks like a 1980-1985. After 1986 I beleave the motors started with the A9 seriaL #"S The mix is 50:1
    Raider<><>
     
    Last edited by a moderator: Apr 30, 2015
  5. Fish4Fun

    Fish4Fun Relaxing.

    Thanks raider thats what i figured and i did believe it was a mid 80's just wanted to check with the resident expert on the merc's, she runs real good..
     
  6. DaleM

    DaleM Original OGF Staff Member

    Hey Raider. that what I thought also. I have that 73 also have an 85 in canada that uses 50-1. Darn I'm getting better with age.