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  1. Sea Rider

    Seamax Return.-

    As don't like doing partial combo optimizations, worse if compromising neat water performance, removed complete inflatable keel and corrected factory flaw found on both keel ends. Now both rests completely flat under alum floor. On last water trail we were about to dial the sweet OB transom...
  2. Sea Rider

    Small oil lower port on NS40C lower unit

    Yep both lower leg oil plugs should be identical. Here's what you need, it's a Tohatsu/Nissan 8 to 9 mm diam thread adapter. Check if Iboats sells them. If not, check West Marine under manual oil pump adapters, bought mine moons back. To prevent oil spills once finished pumping, check if...
  3. Sea Rider

    Type of Boater.-

    Are you the type of boater that sits OB onto transom and voil? or the one who likes optimizing set-up along a prop maximization for top speeding & water performance ? What does this pic say to you if says something ? Happy Boating
  4. Sea Rider

    Seamax Return.-

    This pic illustrates the higher bow riding attitude when on plane at speed, doesn't get any better if more weight is added around bow deck. It's a keel bulb flaw issue. The pic was shot while water flow was passing skimming right over upper water deflector plate, back splash is visible, much...
  5. Sea Rider

    Tohatsu vs mercury

    To illustrate the Tohatsu/Merc Commercial Joint Venture. This is a 4 stroke Merc 20 HP Long Shaft OB-OEM packing. What's funny is that Merc have obviated the Made in Japan wording for Assembled in Japan which is so with Tohatsu local parts. Assume Commercial, Globalization issues, along not...
  6. Sea Rider

    Seamax Return.-

    When thought that playing with shims will dial the definitely sweet lower leg/transom height paramount was wrong, although water flow is now skimming right under upper water deflector plate when on plane, at speed on slight choppy water cond there's a slight prop aeration. As water flow at...
  7. Sea Rider

    Head Gasket.-

    Was wondering if fresh head gaskets must be flexible, if so how much flexible. Asking this due to having changed a new OEM gasket which seemed bit stiff and in just 100 run hours can see a thin white line salt formations around the gasket contour. Before changing gasket, both metal mating...
  8. Sea Rider

    I swear...

    700 Hour Update : You can?t possibly re torque all 8 head bolts with a torque wrench while powerhead sits on middle pan, 2 lower end ones are mission impossible to be reached. On previous powerhead 600 hours restoration all bolts were torqued to 28 NM. As this OB is serviced religiously at each...
  9. Sea Rider

    Seamax Return.-

    Made the water test as indicated previously, now that prop sits much deeper, hole shot is outstanding, OB middle wake exit is flat, close dime turns are superb, handles more weight more efficiently than before. As there ain't no formula on how much transom needs to be chopped down, it's a...
  10. Sea Rider

    Seamax Return.-

    In December wonderful things happens, owner has fully agreed on a transom chop down along a prop maximization. Called the cutter man, he's always willing to chop transoms down as directed. First step was to remove both outer and inner engine plates, mark middle transom center.. Mark the...
  11. Sea Rider

    Honda 5 HP Inquiry.-

    Need to buy the water pump housing of a Honda 4 strokes 5 HP OB. The parts diagram doesn't show impeller liner as a spare part, assume it's an attached part of the whole housing assy, right ? Happy Boating
  12. Sea Rider

    Yamaha F70 wants a different prop.

    Yam and Tohatsu lower legs loves to work at this ideal lower leg/transom height : Parameters to have into consideration : -OB must be 101 % healthy. -Test combo on flat no wind water cond. -Distribute deck weight evenly. -Set trim to 90? beforehand or once on plane if at hole shot OB is...
  13. Sea Rider

    Boat Owners Neglect.-

    First scenario : Boat was just released from general maintenance work and under going its first water test when fire caught slowly, a short circuit along fuel spill related issues. Second scenario : This moored boat was having severe water intrusion which owner though bilge pump could take...
  14. Sea Rider

    I swear...

    Moons back started having general stains throughout the whole Rib due to boating sometimes on non clean sea water conditions along grease falling from crane while lifting/lowering Rib to/from sea. Tried several cleaning products such as benzine, acrylic thinner, clothing detergent, dish washing...
  15. Sea Rider

    Fuel Pump Issues.-

    A shade tree mechanic just rebuilt a Tohatsu 18 HP which owner flipped at sea. All bearings were replaced. The OB has only been tested on a barrel. Starts fine, but dies after some time. When primmed again starts right up and dies same. Disassembled fuel pump and internal diaphragm looks...
  16. Sea Rider

    Prop questions

    WHST (Wot Hub Slip Test) Remove prop and turn it over, with a marker, mark 2 straight lines as in pic, go for a wot spin for some minutes, remove prop and check if marked lines have moved away from originally marked., if so, you have a hub slip and won't know if current prop was a good...
  17. Sea Rider

    Grease Guidance.-

    Need to lube a 5 ton crane cable located on a pier with a proper lube that will hold moisture, work at around 20C? temp, something that will stick firmly onto cable threads, won't dry or fall over boats shortly after applied when crane is working. Which grease compound, lithium, teflon...
  18. Sea Rider

    HOT HOT,HOT!! Temperature gun, good thing.

    This pic will surely cheer U up to clean mentioned exhaust water passage. Most OB's have internal anodes on that area, this is a recurrent salt clog area on this OB. As you can see there's a huge salt deposit on top anode which is limiting extensively water passing by at internal passage to...
  19. Sea Rider

    HOT HOT,HOT!! Temperature gun, good thing.

    OB's water paths will always clogg with salt no matter if OB is flushed conveniently after each use. Are heat/cold cycles that collects mini salt layers one in top of the other inside water paths. Head gaskets are not eternal, should be replaced at around 300 worked hours while taking advantage...
  20. Sea Rider

    Making Oil.-

    Paul, Would you say that all 4 strokes different brands OB's do "make oil", is this a Tohatsu sole issue, has to deal with environment temp fluctuations. Assume applies to all 4 strokes OB's as well ? If so, is it mentioned in Owner's or Service Manuals ? Happy Boating
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