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  1. M

    merc 1979 50 hp lower unit

    does anyone know what the differences in a 1979 50hp lower unit and a 1980's lower unit is? . Do they just have a different gear ratio? I haven't counted the gears yet on the 1980's lower unit yet to see but looks like its all the same. the prop shaft is the same into the mid 1990's
  2. M

    50HP merc powerhead weight vs's a 70hp merc powerhead weight

    Does any body know what a 50hp 4cyl powerhead weighes and a 70hp 3cylinder powerhead weigh both in the mid 1980's 83-84 models. I'm think about using my short midsection from a 50 and putting a 70hp head on it when i run my boat with a outboard jet lower. I just don't want to put to much weight...
  3. M

    50hp merc drive shaft bearing

    On the drive shaft there is a tapered roller bearing on the drive shaft , how do most people get it to come off? torch, puller what ? figured it would just be snugglely against the flange on the drive shaft. I'm wanting to just change the shafts out in the lower unit and not have to replace and...
  4. M

    need help finding prop for jon boat

    I have a 50hp 4cylinder merc that i'm going to run a jet on this spring. But i need help deciding what type of prop and pitch to run when i run the prop lower unit on it. my boat only weighes around 350ibs i'm trying to find a chopper syle prop to really make the boat scream up and down the...
  5. M

    what is the actual hp rating 1980 50hp

    I have a 1978 and 1980 50hp 4cylinder merc . What is the actual hp rating at the prop? I've heard its the actual hp at the crank on older motors .
  6. M

    1980 50hp merc drive shaft help

    :mad:i've never took a drive shaft out of a lower unit before. I have took off the nut that holds the gear onto the drive shaft but the gear won't come off . is there something under the lower part of the water pump holding the shaft in place? i have the water pump off except the plastic...
  7. M

    what year is it 50hp merc

    serial num 5634567 i was told it was around a 1980, i can't find an exact year myself
  8. M

    40hp mercury what year

    5483389 serial num. found for a hundred dollars runs but just want it for the the short midsection to fit my 1980 50hp mercury serial 5634567
  9. M

    What model and shaft length is it

    I've been lookin for a outboard short shaft motor to turn my 1980 into a short shaft . serial number for the 35 hp short shaft is 2423469 boats.net shows it uses the same midsection by part number. I'll be buying the motor over the internet and want to make sure it's a short shaft and it will...
  10. M

    tiller arm for mercury

    I'm looking for a complete tiller arm for a 50hp mercury . I'm tired of ebay does anyone know a used parts place i could find one. doesn't really matter what year it came off i can fabericate parts to make it work if i have to
  11. M

    1980 50hp mercury long shaft to short shaft

    Does anyone know what years and hp rating my powerhead will fit a short shaft mid section and what's the average price that i should give for one
  12. M

    late 70's or early 80's merc 50hp long shaft to short shaft

    i was given a 50hp merc with tilt and trim and would like to put it on my short transom jon boat . I don't want to use a jack plate to accomplish this because i'll need on to raise it for when i run a jet pump. I'm looking for a boat salvage yard that might have the parts to change it to a short...
  13. M

    late 70's or early 80's merc

    I was given an 50hp merc that runs. I'm looking for a place that might have the parts to change it to a short shaft for my jon boat. I don't want to use a transom jack or raise the transom to get it to work on my jon. I plan on using a jet pump part of the time and a prop . I would appreicate...
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