Search results

  1. S

    British Seagull vs. Fisherman

    After replying to Jonboatman's post, I have a question. My 5hp Seagull is supposedly designed for displacement hulls (like sailboats) which never plane out - it is geared low and has a big prop and gearbox. My old Fisherman 5.5hp has a small streamlined gearbox and 2 blade prop and is designed...
  2. S

    High speed, low horsepower???

    I would be very interested in knowing how to get the most speed from, say, a 3hp outboard on whatever kind of boat. I've seen lots of stuff on high-powered machines, but what a challenge to wring the most you can from a little kicker. I'm not talking about hopping the motor up and running...
  3. S

    old chrysler air-cooled 3.5hp motor

    Just bought an old motor for 5 bux for something to tinker with. It's a Chrysler 3.5hp air-cooled unit that looks like it came over on the Ark. It's a Model 303, Ser#3666. Anyone ever hear of an air-cooled Chrysler OB? Anyone know the year of this thing? Looks like the water intake is a...
  4. S

    old evinrude lower unit swap

    Can anyone tell me if the lower unit from a 1954 7.5hp (model 7514) motor would be directly interchangeable with the l.u. on a l957 5.5 (model 5514)? I found one at a local junk store but I don't want to try & talk them out of it unless I know it will fit. I'd like to have a spare l.u. for my...
  5. S

    Using water to decarbonize???

    I have been reading some earlier posts on decarbonizing. Dribbling or spraying water in the carb while revving the engine is mentioned several times. If it works, it would be cheaper and cleaner than the commercial decarb agents. Has anyone ever used this method of decarbing and does it work...
  6. S

    Fixed timing??

    Most outboards have a mechanical linkage that adjusts the timing in tandem with the opening and closing of the throttle butterfly in the carb. Some of the smaller ones don't have this, and speed is controlled by the carb only. Is this fixed timing, or do they have some other way of varying the...
  7. S

    installing lower unit seals - which direction?

    I put new propshaft and driveshaft seals in my old Evinrude 5.5hp lower unit and it still leaks. I've looked at 3 different manuals and they all say be sure to put them in the same way they came out. Unfortunately I didn't pay any attention to this at the time I put them in and I can't find...
  8. S

    removing water from contaminated gearlube

    My old Evinrude 5.5hp Fisherman has a leaky lower unit (water gets in) and I have tried to reseal it without success, so I have given up for now and instead I drain the L.U. and refill it each time I use the motor. Is there any simple way to filter the water out of the water/oil emulsion so...
  9. S

    2 questions about thermostats

    Lake Havasu water temp is in the low 80's during the summer (now) and a local boat mech said it was OK to run without a T-stat while the water was warm, but put it back in during the winter. Opinions? My other question is why don't most of the small kicker outboards have T-stats? Comments?
  10. S

    idle relief ports

    After searching the board to learn about what idle relief ports do, I found an old post by Schematic where he speculated what would happen if you plugged them up. Schematic if you're out there did you ever try this? Has anyone ever tried this? Just very curious about this. Would appreciate...
  11. S

    racing type prop on a 2hp motor?????

    I have a Yamaha 2hp motor with a plastic prop that I thought had a kinda funny shape as the blades were completely flat on the trailing edge. I have since found out that this is called a cleaver prop and that they are used in racing and run best when only partially submerged. I did raise the...
  12. S

    adding a tell-tale to older Force

    My 1989 Force 50 has a plugged hole in the cylinder head just above the thermostat which I learned from another discussion on this board is for a water pressure gauge. If I put a fitting in and ran a small line out through the lower cowl for a "pee hole" type tell tale, would it drop the water...
  13. S

    old evinrude vent/drain screws

    I want to replace the vent/drain screws on my 1957 Evinrude Fisherman 5.5hp lower unit, but I have purchased 5 different sets of screws locally and they have all been too large in diameter to fit down into the recessed holes in the gearbox. Everyone says these are the standard OMC replacement...
  14. S

    little plastic prop

    I have a Yamaha 2hp motor with a plastic prop 7 1/4 diameter, 4 pitch. I think the motor may not be reaching its full rpm & hp output. The motor is nearly new in excellent running condition and I am thinking about reducing the diameter to get more rpm. The pitch has to stay the same and this...
  15. S

    hydrofoil stabilizer mounting holes

    I have a hydrofoil stabilizer fin that I put on my Force 50 motor, used it once and decided that the loss of top speed wasn't worth the improved stability. I filled in the 4 holes in my cavitation plate with JB Weld because I was afraid the holes would aeriate my prop. I'm thinking about...
  16. S

    discussion on water pumps

    Most outboard water pumps haven't changed in 50 or 60 years; they are dependent on a fragile rubber impeller which must be replaced frequently, and is often very difficult to service. Why can't some smart engineer design a rugged, durable, idiot-proof low maintenance, easy to service pump that...
  17. S

    old evinrude water intake

    I have a 1957 Evinrude 5.5hp Fisherman with the water intake on the exhaust port. Also just above the cavitation plate is an aluminum cover plate with 4 louvered holes in it. If you face the louvers forward it seems they would scoop more water in, if backward ?? Plate will screw on either way...
  18. S

    WOT harder on motor??

    Is running a 2 stroke outboard continuosly at WOT harmful, rather than backing off the throttle and running more gently once the boat is planing? This may sound like a dumb question but I would appreciate some opinions. I have a 50 horse '89 Force and an old 5.5hp Evinrude and dont want to...
  19. S

    More power from little motor?

    In looking at the specs for new Mercury motors, the engine displacement for the 2.5 and the 3.3hp is the same. The only difference is the gear ratio: the 2hp is 1:85:1, and the 3hp is 2:15:1 The 4hp and the 5hp are identical in displacement, and gear ratio. How can you get more power from...
  20. S

    2 questions about oil

    l. I have a 2000 model Yamaha 2hp motor and the manual says use 100:1 ratio, but the shop that sold it to me said use 50:1 as the engine will last a lot longer. Who is right, the manual or the shop? 2. I also have 2 old Evinrudes, 1957 5.5hp, and 1968 3hp. Can I use 50:1 in these...
Top