Recent content by MarshMan73

  1. M

    Opinion On 2005 Merc 150 Carbed

    Well, I'm still looking for a replacement motor for my old tired 86 Merc 175 for my V20 Cuddy. Compression on it is down to 100psi and getting real hard to start sometimes due to that. It has been used extensively in salt water which makes rebuilding out of the question for me. I have found a...
  2. M

    100:1 Mix for new 15HP Yamaha??

    My friend has just got a new 15HP 2009 Yamaha 2 stroke. His dealer told him to run a 16oz bottle of oil first trip out in 6 gallons of gas. His book says mix 25:1 first trip out and then 100:1 after break in. I told him do what the manufacturer says not the dealer. Is anyone else really running...
  3. M

    Is this a bad idea or what?

    Ok I've had enough trying to get this old wore out 1986 175Blackmax to run right. So I need a new motor. I ran across a complete 1988 200Hp powerhead freshly re-ringed and bearings changed. It has been ran 4 hours on a dyno. I can get it for very little $$. I was told it would drop right on...
  4. M

    175 BlackMax idles good, but lost 800RPM on top end

    I have had a time with this motor. It is a 1986, 175HP, V6. Found a few water drops on #3 cylinder and replaced cracked, rusting head gasket. Compression was down 10psi in that cylinder, now all are at 105. Took it out yesterday and ran it but would idle rough and was low on top end. Only got...
  5. M

    Foam insulation on motor cover replacement

    I had to remove the foam insulation that is glued to the inside of the motor cover today. It was in very poor condition and was starting to get brittle and come off in chunks and even powdery pieces. I got it all out and washed it clean with a pressure washer. Anyone else have a similar problem...
  6. M

    '81 Evinrude 35 No Power

    My friend's 81 Evinrude 35HP is causing problems. It won't plane out now, but idles fine. Starts everytime and idles beautifully until you try to get up on plane. It just makes a loud wah, wah surging noise and stays low rpms. It is using about 5 times the amount of fuel it normally takes to get...
  7. M

    Design1 or Design2 Head??

    I have a 1986 175HP BlackMax. I cannot find what type head I have to order the gasket. I DO know that it is a 1 peice design, it does NOT have a seperate water jacket cover. Have called all local boat shops and SeaWay out of Washington, but noone know how to tell which head is which. Does it...
  8. M

    Water intrusion. Is it too late for BlackMax?

    Ran my BlackMax this weekend and noticed it a little harder to idle at first crank but then ran great. Idle was a little rough and it used more gas when at WOT. Brought it home and noticed a little water on the plug for #3. Took the head off and to my horror I found a little sliver of chrome...
  9. M

    Boat A/C Anyone

    Does anyone here know something about boat A/C's? This one is on a 56 foot sailboat. It has no ID labels left on it anymore. Unit runs, but doesn't cool very well. Seems to have either weak glycol solution or incorrect charge. Unit is a 115V, R-22 based, cap tube system. Utiilizes seawater for...
  10. M

    175 BlackMax Lower Unit Removal Help!

    I've got the manual. I've got the tools. I got all the bolts loose and the anode removed and hidden bolt removed, but I still can't get the lower unit to seperate from the tailshaft by more than 1/8". It seems to be binding on the front center stud. The nut came off easy enough and the washer...
  11. M

    86BlackMax Idling Problem

    Just got this boat a few weeks ago and have run it 100 miles over the last weekend. Today I put it in the water and it didn't want to start. Finally got it to start and ran out to my fishing ground 10 miles away. Motor ran strong and true until I got there and was trolling around at idle speed...
  12. M

    Questions about '87 Blackmax175

    I'm looking at buying a boat from a friend of a friend that has a 1987 Mercury Blackmax 175HP motor on it. It has been sitting for several months and when I went to see it all it took was a few pumps of the primer bulb and it fired, but died on the first 2 starts. On the third start it stayed...
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