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  1. J

    Proper spark plugs W / W/O resistor? Merc 50 4 cyl

    I have an 82' 50 hp, 4 cyl 2 stroke. I've always had low rpm random misfires while cruising slowly in gear. It's kind of annoying. The plugs usually look fine aside from one black spot on the ceramic of each plug. But they don't ever foul out. It's been having a little less power the last few...
  2. J

    Help troubleshooting low power inline 4 50HP

    I have an all original 1982 50 HP merc. The compressions are all in the 135 range. The idle is good, acceleration seems average, but much less than it used to be. Every year the last three years it's been getting weaker. Now it can barely plane off if I put two people in the boat, and has a max...
  3. J

    Owners manual needed 115 inline 6

    I have a mid 80s inline 6 115hp, Tower of Power engine. Just got it for my old Mako project. I don't know what diameter and pitch prop to use. My older 50hp Merc owners manual goes into great detail of exactly which diameter and pitch, and even part number prop is needed based on boat size and...
  4. J

    Evinrude 88 conversion to 120

    I'm looking at a very clean engine for sale that's supposedly converted to a much higher HP. They said it's been modified by Zeke himself before he passed away. Zeke was a well known local Evinrude guy who had a dealership in Jupiter, FL. They're telling me the engine was 88HP, and with the...
  5. J

    How do I change the upper steering/shock mount- 1982 50HP

    Upper and lower mounts are completely shot, but uppers look impossible to change. Am I right for thinking it looks like you need to remove the engine block to have access to the upper steering mount rubber bushing?
  6. J

    A little advice- water pump 1982 50HP

    I just changed the water pump in my 82 50 hp (4 cylinder). The parts diagram shows more parts than are actually in the kit. I'm mainly concerned about the connection point between the output port on the pump, to the pipe that pumps into the engine. The parts diagram shows a nylon seal and a...
  7. J

    2 stroke oil requirements 1983 50 hp 4 cylinder

    I have an original never overhauled engine. It's still running perfect. Last two seasons I used Yamalube synthetic and premix at 50:1. This year I got a good deal on a gallon of Quicksilver full synthetic. However the Quicksilver doesn't mention that it can be used on outboards. It's for PWC and...
  8. J

    Where do I find engine weight?

    I'm working on my homebuilt project, a 21 ft bowrider I/O that I'm converting to an outboard. I'm looking for the weight of the 1995 200 Black Max that I'm going to install. I found some manuals online but didn't see the total weight anywhere. Since it's getting installed on a 36" bracket I was...
  9. J

    Please help identify model year engine

    I just bought a used boat/motor/trailer so I could strip the motor off it. The seller didn't know what year the motor was but was guessing mid 90's. Here's what I know about it: 200 HP Black Max 2.5L Offshore V-6 model. It has carburetors- not injected, and also has an oil tank mounted inside...
  10. J

    I/O to Outboard Conversion

    I'm about to attempt a fun little project over the next year, hopefully be done by next summer. Looking at a 1995 Riviera 21 ft bowrider that's missing the engine and outdrive. The hull's in solid shape, needs cushions replaced and new covering on the instrument panels. The thing I love the most...
  11. J

    Need to learn some basics about Volvo Sterndrives

    I'm close to purchasing a project boat, with a 3.0 Volvo Penta Sterndrive. It's been parked for a few years but was running great last time out. The seller says it's an electric shift....how does that system work? I can't find info on Volvo/w/electric shift, only OMC. Besides sterndrive...
  12. J

    Carburetor Upgrades?

    I've got a leaky carburetor, and the float is rotting apart- basically time to rebuild since it's never been rebuilt in 28 years. During the last 28 years since this engine was built I'm sure there's been improvements in the carb designs that may make them more efficient and possibly more power...
  13. J

    Temperature Question 1982 50 HP Merc

    I've got a 1982 Merc 50HP on a Grumman 15ft boat, that's been in the family for 28 years. It's never been overhauled, and guestimated it has around 1,000 hours on it. It's always been flushed with fresh water after each use, along with the fuel disconnected to let the carbs run themselves out...
  14. J

    Pontiac IO drive Setup?

    Just wondering if there's any IO drive setups designed to use any other GM engines besides Chevy. Buick, Olds, Pontiac, and Cadillac all have the same transmission/bellhousing bolt pattern and Chevy is in it's own class. The reason I'm asking is because I'm looking for a project boat to install...
  15. J

    Question about Speed Sensor 50 HP Merc outboard

    I've got a 1982 4 cylinder, 50 hp outboard. It's got a built in speed sensor pickup port in the lower unit so I won't have to buy a sensor for the speedometer I'm installing. The problem is, I don't have a clue where on the engine the speedometer sense hose is supposed to connect. I've got the...
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