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  1. K

    Inconsistent performance 84' blackmax 150

    It's been about 5 weeks, but I'm here with an update. Short answer: Switchbox malfunction was causing no spark on cylinder number 4. Before doing the basic thing of checking spark, I had cleaned and drained my tank, installed a fuel water separator and filter, took my carbs apart (they were...
  2. K

    Inconsistent performance 84' blackmax 150

    Avoiding pulling the carbs apart to save gaskets, but better safe than sorry is true. Was hoping reading Temps and taking the boat out one more time and testing would possibly safice. We will see next week.
  3. K

    Inconsistent performance 84' blackmax 150

    Great info you guys have given me. I got to mess with the boat today. Pulled my plugs and they were all pretty uniform, none seemed overly wet or burnt. I found one with a cracked porcelain, replaced that one and cleaned the rest. NGK BU8H. When I bought the boat he said he just replaced the...
  4. K

    Inconsistent performance 84' blackmax 150

    I guess it could be hard to tell, they say to do the usual maintenance of plugs etc. annually, which I haven't. Ill look through my carbs and plugs before my next trip. Thanks for the reply.
  5. K

    Inconsistent performance 84' blackmax 150

    Hello! It has been over 2.5 years since I've made a performance related post on my outboard, thankfully. When I bought my boat with this outboard I had a huge learning curve, got an OEM service manual and I set my primary pickup, spark advance, and idle within spec. Pulled apart and cleaned my...
  6. K

    1985 Suzuki Dt115, what's it worth?

    I'm helping my buddy pick up a boat today. The previous owner swapped a dt115 manual trim motor onto the boat, and then abandoned the project. These seem to be uncommon outboards, considering it runs and shifts, what's it worth? Thanks.
  7. K

    What would happen if an engine died on plane?

    That's interesting, fair enough. Water will hit the stern with the boat tilting back after stopping a high speed run normally, so I really didn't know what to assume. Someone told me the boat could spin out. I've had my motor trimmed and not given enough throttle and gotten a hopping action on...
  8. K

    What would happen if an engine died on plane?

    I'm not sure what topic or sub this would fit into appropriately, but I've had this question in the back of my mind for awhile. Say you improperly attached a fuel hose and it popped off going full speed down the lake, what would happen and how would you handle such a situation? I'm not the most...
  9. K

    What is Primary Pickup?

    Okay, understood. May or may not come back to this forum thread. I appreciate all the responses.
  10. K

    What is Primary Pickup?

    Im not sure what 'on a hose' means but yeah I guess I wasn't thinking about neutral vs in gear. Idle rpm in forward gear is supposed to be 6-700. So, if all is well there I may not touch it.
  11. K

    What is Primary Pickup?

    Update on my 84' blackmax's timing. I learned a lot yesterday and was able to do most of the steps in my service manual which I previously didn't understand. Although I understand the results of an inaccurate timing cover, by looking at the piston head through cylinder 1 and looking at the...
  12. K

    What is Primary Pickup?

    This would be an easier adjustment and will note this. This is more like the answer I was looking for. I'd like to set it properly and not have to worry about it anymore. I was able to generally set the spark advance based off of the 11/16" measurement between the arm and the block. Being an...
  13. K

    What is Primary Pickup?

    Okay, so that's fairly good news for me. My carb shutters are shut at idle and my hotfoot responds accordingly. I've previously adjusted the full throttle stop screw. Boat idles and runs alright, so I guess I should just leave it as is.
  14. K

    What is Primary Pickup?

    Maybe, I'm referring to the smallest screw among the bunch, between the arms. It is called primary pickup in my service manual.
  15. K

    What is Primary Pickup?

    Earlier this year I picked up my first boat and have since been giving it hell, as my first forum post can show for some of it. The spark advance timing screw wiggling loose was the primary culprit for poor performance. I took the proper approach and purchased the proper factory service manual...
  16. K

    Mercury 150 not performing well under load and drinking gas.

    Any measure or way for me to get it correct? or should I continue to tinker with the screw until it gets on plane faster and runs more efficiently? I'm sure the service manual would help me do this properly, but I haven't gotten one.
  17. K

    Mercury 150 not performing well under load and drinking gas.

    Thank you
  18. K

    Mercury 150 not performing well under load and drinking gas.

    Big day in progress for the motor. I cleaned out the carbs again this morning, used a wire, air, and carb cleaner. I replaced the primer bulb, come to find out wasn't really necessary but it doesn't hurt to have a new one. And I adjusted the floats on the carbs a hair. I noticed they were all...
  19. K

    Mercury 150 not performing well under load and drinking gas.

    The explanation of the function of the diaphragm was helpful. It is a more oblong shape right beside the carbs. I did disassemble and reassemble this yesterday. Replacing most of the assembly with this kit is on my list of things to try (https://www.crowleymarine.com/parts/3699.cfm). Work is...
  20. K

    Mercury 150 not performing well under load and drinking gas.

    The previous owner put in a lot aftermarket parts including a new stator and trigger. A service manual would make my and this engines life a lot happier. The one over 100$ is my best bet huh?
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