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  1. halmc

    Idle mixture adjustment, 2005 25hp four stroke model: 1F25412DD Serial: 1B169120

    Not a word in my service manual about how to adjust the idle mixture screw on the carburetor. Since I've fixed my bowl from running over mentioned in an earlier post, I now want to get the mixture right. My plan, after waming the engine up is to adjust the screw for max engine vacuum if I can...
  2. halmc

    2003 15hp big foot -- air cooling?

    Here's pictures of my new-to-me Mercury 15h big foot. The gentleman who sold it to me said that it had an odd click but was otherwise in good shape. I wasn't able to get it to start, so I tore it down and am wondering if it is a special model with air cooling. Any help much appreciated.
  3. halmc

    My bowl runneth over!

    OK, my luck is runing good this AM so lemmie try another question. The engine mentioned in my model number post is a 2005 mercury four stroke 25hp. My engine does not surge. It does the opposite of surge: that is, I can be honking along at any rpm and periodically, the engine temporarily...
  4. halmc

    25 hp, four stroke, 2005 mercury bigfoot. Model #?

    I have a 25 hp, four stroke, 2005 mercury bigfoot that sports two identification placards that appear below. I have serched in vain for a model number that is even similar in format to those found in parts microfiche, e.g., 1F25312DN. Note: this may or may not be the model number of my...
  5. halmc

    Auto enrichener question, 2005 25 hp fourstroke, electric start, remote control

    The ECM decides when the engine needs enrichening. However, my remote control, which hitherto has controlled an aging mercury four cylinder, two carb, two stroke, has a 'push the key' choke with attending wire back to the engine where it used to connect to the choke solenoid. I'd like to use...
  6. halmc

    2005 Mercury 15 hp 4/stroke vs 1998

    Can't find a downloadable manual for my 2005, but have found one for a '98. Anyone know these engines well enough to say whether there are changes in the engine from 1998 to 2005 that would materially affect the usefulness of the 1998 manual as I work on my 2005? Much thanks!
  7. halmc

    2005 15hp 4strk: New Crankcase assembly: how complete?

    On a lark I bought a 2005 15hp four stroke mercury with its top rod pitched right through the crankcase, right at the junction beween what I would call the block and the base. I know that I will need lotsa parts to fix the motor, but my question is directed only to what likely is included with...
  8. halmc

    '84 50 hp 4cyl Is electrical system regulated?

    Just replaced the three post electrical component on my engine with part #62351A2, which most vendors call a rectifier. (Engine serial # is 6540519) At 2500rpm, the system voltage now rises to an amazing 17.4VDC. Before I replaced this part, it wasn't charging at all, i.e., the system voltage...
  9. halmc

    Evidence of overheating: 2005 25hp Mercury four stroke.

    I'm going tomorrow to have a look at a supposedly low time, fresh water Mercury four stroke. Is there any indicator of overheating other than the discoloration of paint? Is there, for example, any sort of plastic or other material anywhere on the engine that was inlcuded by mercury...
  10. halmc

    Tach 'drive' data? 50hp, four cyliner, two stroke, ~1984.

    I'm assuming that the tach senses engine rpm via the gray wire that is connected to the rectifier cuz it's the only electronic link that could carry that sort of data I see in the schematic, and cuz it's sent via the remote control wire harness to the control head. If not the gray wire than how...
  11. halmc

    Mercury -- Morse throttle control--part name or source?

    My Mercury '84 50 hp, 4 cyl, two stroke, seems to be equipped with Morse controls. EDIT: Found the part, no question remains.
  12. halmc

    Merc inline four, trigger assembly function?

    Well, my first trigger assembly question isn't faring so well, so let me try a second: There seem to be two coils on the trigger assembly and four leads eminating therefrom. It would help me to know if the function of each coil is the same as the other. That is, is one coil for two cylinders...
  13. halmc

    Trigger assy resistance -- '84 Mercurh 4cyl, 50hp, 2strk, serial 6540519

    While cleaning the carbs on my new to me '84 50hp (I think it's an '84) I noticed that one of the four wires coming from trigger assembly to the switch box had been repaired, but broken again. Upon further inspection I found that the wire in question had been subject to high current at some...
  14. halmc

    '84 Merc 50, 4cyl, 2 stroke: air filter?

    "air filter" was the only word I could think of for my heading. The new-to-me engine described above (Ser # 6540519) has absolutely nothing upstream of the carburetors. That is, there is nothing connected to the intake side of the carburetors -- nothng for filtering or silencing. Reference to...
  15. halmc

    9.9 Evinrude model E10FRELEVA Four stroke: Has no mid range

    I've been chasing this issue for about a year. My engine idles very well, runs wide open very well, but getting from idle to wide open is nearly impossible. No matter how fast or slow I move the throttle from idle to wide open, it begins to stumble just off idle, may or may not "catch". If it...
  16. halmc

    Engine Stop Control: Catalina 30

    I'm having difficulty finding a good, non-ferrous engine stop control -- the one that shuts down the fuel from the operator's panel -- for my Catalina 30. Would really like to find one made of bronze or brass, as all my sailing is in salt water. Any source much appreciated!
  17. halmc

    25hp, 2s, Tohatsu, astonishing symptoms:

    Tohatsu M25C3, serial 51176 The following symptoms follow a complete and thorough carburetor cleaning along with removal of the flywheel for visual inspection of the exciter coil. It's a low time motor from which any sort of corrosion is essentially absent. Motor barely starts, won't stay...
  18. halmc

    Evinrude 9.9 ES -- Battery required

    Expecting delivery of my new-to-me '97 Evinurde 9.9 electric start four stroke, model E10FRELEVA which I shall use to power my pontoon boat during the months when my nearby lake is restricted to 10 hp or less. Can the motor be run (for a preliminary test run on another boat) w/o the battery...
  19. halmc

    Picture of impeller: good or bad

    From a Yamaha. Fits snugly into its housing, no visible wear. Good or Bad?
  20. halmc

    40hp, 3cyl, 1992 Yam OB overheats

    Yup, it sets the control box alarm at idle, with muffs or in the water; and in the Water with WOT. Here's what I've checked: 1) pulled lower unit, inspected impeller, no apparent defect and it's keyed properly to the shaft. 2) temporarily and briefly disabled heat sensor -- other symptoms...
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