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  1. J

    Yamaha F25 propping

    I'm working with a customer's War Eagle 548 (15' length, 48" width). Hull weight around 340 lbs, plus the 140 lb motor, plus 40 lb battery , 3 gal fuel and gear. Probably around 600-650 lb total (he runs light most of the time). Currently has a factory Yamaha 2 stroke prop on the motor. 9...
  2. J

    Yamaha F25 (4 stroke 25 HP) propping

    Just picked up a new (to me) boat. 1548 War Eagle, Yamaha F25ESHY (2000 model), short shaft, tiller steering. Working on setting it up. And (hopefully) settling a score with the local guy... Anyway, Current RPM is 5800-5850 with a "normal" load (me, dog, tackle and supplies) and 28.1 mph...
  3. J

    Yamaha F25 4 stroke 25 HP project

    Local hunters all think a 25 4 stroke is WAY slower than a 25 2 stroke. There IS a little truth to it but I grew up tuning 4 stroke small engines. I KNOW I can make one of these things scream, without increasing RPM all that much. Anyway, I am looking for a part for mine. It's a 2000 model...
  4. J

    Yamaha F25 manual starter

    I have a 2000 model F25ESHY, electric start only. I am understanding that some of the Mercury 25 4 stroke twin cylinder engine parts are interchangeable. I'm trying to add a backup recoil starter to this motor, Yamaha dealer says it's unavailable (or more specifically eternally backordered)...
  5. J

    'duck' boat--tuning advice?

    I'm an experienced outboard tech (Yamaha only up to about 100 HP), but a noob when it comes to getting the most out one. Normally we just hang the motor on the transom, screw it down and let it go. And 99% of people are happy with that. What I have is a customer with a 1542 Grumman flat...
  6. J

    12v trolling motor running at 16v?

    My 40lb Motorguide works great, but occasionally if the wind is blowing just right and I'm "stuck" on a stump, I'd like a little extra. Would love a 24v setup-but just not in the budget. Question is...I have an extra 16v battery for my race car. I am wondering if anyone has ever contemplated...
  7. J

    90 HP mariner losing prime?

    88 90 HP 3 cylinder 2 stroke Mariner. It's a 3 carb motor-single fuel pump and it's rigged on a 16' bass boat with a built in fuel tank. FINALLY got it running properly. But when I pump up the fuel line to prime the carbs, it will start and run great. After running and then shutting the...
  8. J

    25ESH Yamaha low compression

    25HP twin carb 395cc (IIRC) premix motor I work for a local dealer, and we spend a lot of our fall and winter months working with 25esh outboards mounted to duck boats. Many of our duck hunters are fairly rough on their motors as expected (comes with the duck hunting territory). Long story...
  9. J

    Mariner 90 HP 3 cyl

    Got a couple questions. I've had this motor for a good while but haven't used it much and always winterized it if it was going to sit more than a month at a time. I use it year round...but occasionally I'm not sure how long it'll be until I use it next, so I'll winterize it. Anyway, got it...
  10. J

    1986 Evinrude 9.9 short shaft starting

    I've had this boat for a long time...a 14' flat bottom aluminum boat that I gave to my dad so that he could run over to lake and catch Crappie. The problem is, the 9.9 Evirude that is on the boat is a manual start. He's getting older now...and it's harder for him to pull the start rope. It's...
  11. J

    not enough trim?

    I have an '87 Tidecraft 16' bass boat, 88 model 90 Mariner 3 cyl with PT&T. Seems like I can't trim it "out" enough. I trim it all the way up but it seems like the boat could use more. It keeps speeding up until it won't trim out any more, seems like it could go more and benefit. Trim rods...
  12. J

    quicksilver prop?

    I have a mariner 90....came with a stainless prop. The number on it is 48-7250021p, 21" pitch. It is beat up pretty good. I need a replacement for it. I assume this prop is an old-school quicksilver prop. It will be going on a 16' bass boat, so I am looking for a good performing stainess 3...
  13. J

    Mariner 90 3 cyl couple questions

    1987 model I believe (serial 0B132734).... Starts ok but will run on one cylinder for a while, then it will take off & run on all 3. Seems to be worse in cooler weather. Sometimes during the summer it would run fine. Seems to only do it when the engine is first started-after it is run for a...
  14. J

    what prop do I need?

    I have a '87 Tidecraft Spitfire V15 (16' length) bass boat with an '87 Mariner 90 3 cylinder outboard. I currently have two props-one is a Quicksilver 12 3/4" 21" pitch stainless 3 blade, the other is a Solas Amita 4 aluminum 4 blade 19" pitch. I use it mostly for fishing...not competitively...
  15. J

    1987 Mariner 90

    I have an 87 model Tidecraft V15 bass boat. I believe it is 15'6" length. It has a 87 model Mariner 90, with a Quicksilver 48-72500A5 21" prop--I do not know the diameter (I believe it may be a 12 3/4"?) No jack plate and the engine is mounted in the second hole from the top (moved up about a...
  16. J

    90 HP Mariner questions

    I have a late 80's Mariner 90 3 cyl two stroke. The serial starts with 0B132...and that is all I can read. At the top of the page there is a sticky that gives links to help find the year model, but I don't see mine listed. Anyway, I am having a hard time starting and idling. I have messed...
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