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  1. scout-j-m

    Yamaha 25 Electric Start Conversion Kit ?

    Thread is a little old but I'll go ahead throw in what I know. The 2 most expensive things you will need will be the starter and then a toothed flywheel. I have had two early 90s model 25's like yours - one e-start and the other manual - and both had toothed flywheels. I have a couple of manual...
  2. scout-j-m

    2009 Yamaha 25 ticking in neutral

    If I understand you right, then I don't believe what you are doing is actually changing anything. As long as the barrel nut is engaged to the threads on each shift rod it doesnt matter the position up/down. All that's happening is the barrel nut is moving while both shift rods are staying in...
  3. scout-j-m

    2009 Yamaha 25 ticking in neutral

    I guess I am still a little confused then. When you say adjusted the barrel nut all the way up to all the way down what does that mean exactly? Sounds like either the entire shift linkage is skewed in the forward position or you have worn clutch dogs or worn shift cam.
  4. scout-j-m

    2009 Yamaha 25 ticking in neutral

    The long barrel nut should be paired with a regular sized jam nut to lock it in place. If the jam nut is missing I would probably assume whoever put it back on previously didn't do it right. I couldn't tell you the jam nut size offhand but I think it takes a 10mm wrench. If you take the barrel...
  5. scout-j-m

    2009 Yamaha 25 ticking in neutral

    It's definitely not adjusted right. If I remember right those are push/pull to shift type and you have to shift those into reverse in order to be able to access the barrel nut connecting the motor side and gearcase side linkages. This also means they both need to be fully engaged into reverse...
  6. scout-j-m

    25MSHB Rebuild Thread

    I have a fully disassembled Yamaha 25hp motor I am about to dive into rebuilding. I bought it as part of a parts lot which primarily included motors with "bad crankshafts". The man I bought them from had bought the parts lot himself and really never got to working on them so it's kind of second...
  7. scout-j-m

    Yamaha 8hp (model 8SF, 1989) with water in cylinders

    Thank you for the reply. I'll take your advice and throw some oil in the cylinders to make sure everything gets coated. Since it fired right up I think I'll go ahead with a carb clean to clean up the low speed orifices and jet and then move on and do a water pump kit and then drain, pressure...
  8. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    The nighttime check sounds like a good idea. I'll definitely give that a try. Will probably be a while before we are able to go for another test run so may be a while before I update it but definitely will let yall know how it goes.
  9. scout-j-m

    Yamaha 8hp (model 8SF, 1989) with water in cylinders

    A friend was given (or maybe "borrowed") a 1989 Yamaha 8hp, model 8SF, from a coworker of his for his teenage son to use on his jon boat. I told them to bring it over and I'd help them go over it and see if its a runner after sitting in the guys shop for years. I think the story was the guy my...
  10. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    Thanks so much! I'll check for that build date asap. So from an electronics perspective, what all could I potentially swap over? swap the stator from the newer motor to this older one as long as I also swapped the dual rect/regs? swap the trigger? swap out CDI boxes? swap coils? We will...
  11. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    No, that's still very informative information. Maybe will come in handy once I get this one back going. Can compare performance numbers to what you stated here.
  12. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    That serial number is off of the transom bracket so I guess that is a bad one to go by. I need to find the one on the powerhead itself. I looked on the top and there is one welch plug and another spot where it looks like one is missing. The present one has the numbers " 6568786" so it doesn't...
  13. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    Just adding a couple pics for clarity. BTW, the carb stamping reads WH-29 (hard to read).
  14. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    Swapping the two reg/rec and stator seems like a good idea then. If I read the manual right, that newer stator is a 40amp one too. Also, I was unaware they were different displacement blocks. What all models did they build off the 2.4l block? 150, 175, and 200? Is the difference the carbs...
  15. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    Yeah it idles about perfect. Punch the throttle down all the way and it goes up smooth and quickly to about 3000 rpms and just hits a wall. Boat nose just lifts up and stern plows water. Engine, despite not going up in revs, sounds smooth and there is no miss, hesitation, surging, etc.
  16. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    I just did static test of the stator and trigger on the 89 model that's giving me fits. I got 4100 and 3800 ohms on the stator low speed leads and then 120 ohms on both of the high speed ones. That's in spec for the 40 amp stator like the 92 model motor has (with 4 yellow rectifier leads). I...
  17. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    It ran pretty well at first. It was a little slower than the the previous motor but they had different props on them as he never swapped them out. I can't remember exact speeds or revs but it probably ran in the low 40's at a little above 5k rpms....so while maybe not propped ideally, it was...
  18. scout-j-m

    Ignition Compatibility on 150hp Blackmax

    My dad bought a 1992 Procraft 185 F&S a couple years back that came with a 92 model 150HP Blackmax, SN# 0D145256. I posted some about it on here a while back but long story short it had catastrophic faiure on the port side cylinders I think. He since found and bought a 1989 model of the same...
  19. scout-j-m

    Carb Roller Part # for Yamaha 25ESD

    Bumping this thread because I found a cheaper solution. After I posted this, I made do by swapping a good roller from another similar year motor onto this one. I still needed a few rollers though as I have 3 of these in my shop to fix up, all with worn rollers, and I just sold the one with the...
  20. scout-j-m

    Strange power loss 1991 Yamaha 25MSHP

    I'm curious about the busted bowl gasket. All carb bowls are vented to ensure they stay at atmospheric pressure so that the venturi can effectively pull fuel through the jets. On this particular carb, the bowl is vented to a spot just under the upper plate/gasket that covers the low speed...
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