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  1. Sea Rider

    Tohatsu M18C2 won't start

    The easy check out prior removing flywheel.. Throttle grip to max till stops, check if carb opens all the way to 180?, while leaving there, check timing plate under flywheel, will see some lines marked, being the largest 0 deg. Check at which mark plate has stopped when at middle matting...
  2. Sea Rider

    Height of motor question.

    You are giving to many turns to the subject. You can follow those parameters as per manual, with that setting will not know at which lower leg height will water flow pass when combo is on plane while riding parallel to water level, look over transom and compare it to previous posted performance...
  3. Sea Rider

    Height of motor question.

    Forget all about if it has to be about 1 inch higher than rear keel, that's pure speculation, useless word of mouth going over and over. No OB brand has a fixed height, varies between 10 to 25 mm, boaters don' like reading Owner's Manuals, that's for sure. Still doesn't say much... In real...
  4. Sea Rider

    Height of motor question.

    Reading post again, why does OB needs to sit in a jackplate in the first place. Remove jackplate, sit OB trimmed to 90?, go for a wot spin on flat water as usually loaded with deck weight well balanced, once on plae, pull head out transom and check where is water flow at speed is passing through...
  5. Sea Rider

    Which prop (3 or 4-blade) for a 18.5 ft Alicraft 18 Norwind with Mariner 90 2T

    This pic will illustrate how water flow at plane passing through 3 lower leg height positions will dial different OB performances, being (1) top (2) so-so (3) worst all while combo rides on plane parallel to water level with OB trimmed to 90? Happy Boating
  6. Sea Rider

    Which prop (3 or 4-blade) for a 18.5 ft Alicraft 18 Norwind with Mariner 90 2T

    If at plane wile OB sits at 90 deg you can see water flow at speed passing right above lower AV plate, need to raise OB with wooden shim for flow to skim right under upper small plate as in last previous posted pic. If already there, leave it that way, if going over small plate a bit will...
  7. Sea Rider

    Which prop (3 or 4-blade) for a 18.5 ft Alicraft 18 Norwind with Mariner 90 2T

    Let?s do some ABC experimentation? Let's suppose that your OB has manual trim, so set it to 90?, that's perpendicular to water level as in pic. Distribute deck weight evenly.. Make a wot test as indicated and check if prop aerates on close turns on calm water cond. If not, height is ok...
  8. Sea Rider

    Tohatsu clone or not.-

    A friend of mine bought second hand this 4 strokes Evinrude 15 HP OB, needs to change complete carb as he messed with it and broke something inside beyond repair. Besides the OB came with a variable pitch Pro pulse Prop, which is great, but OB is way under powered for use on a 430 Mtr Rib with...
  9. Sea Rider

    Gear Box Parts..

    Was wondering which Tohatsu gear box part wears out faster if any in the 9.8-30 HP model range, provided that oil changes are done periodically and properly geared while at idle ? Which parts should one stock if any ? Happy Boating
  10. Sea Rider

    Seamax Return.-

    It's been a tough work dialing sweet lower leg/transom height due to Sib having too may factory flaws. Check the difference in lower leg heights before as when taken out of the box and after modifying (chopping down) transom height. Before : Wate flow was passing on top of Anticav Plate at...
  11. Sea Rider

    Seamax Return.-

    On a water trail with slight wavy and windy cond with 2 up sitting way aft, combo which weights around 400 Kg achieved 37.5 Km/h at 4700 wot rpm. Sib was top inflated to 3.0 PSI for best overall rigidity. At 3/4 throttle the boat literally jumps onto full plane under 4 seconds, no need to...
  12. Sea Rider

    Seamax Return.-

    After masking side tubes, transom plates, painted both sides with black matte aerosol paint, 3 coats one after the other were applied with enough time for each paint coat to dry well. The finish is even.. Once dried, installed on transom two heavy duty front & rear metal plates, the...
  13. Sea Rider

    Seamax Return.-

    As the original cut was made at sight, needed to be angled to 90? for OB to sit straight on middle shim. Fiberglass techie made a nice wooden shim half of what was originally cut, transom's cut was resin coated before shim was hammered down, both shim sides slit tight at both sides. Once...
  14. Sea Rider

    Wash Over Transom Reality or Myth.-

    Was intrigued after reading Capt?n Caution post that Duras large 380-420 Mtr Sibs were being built with long shaft transoms and long shaft OB's to avoid transom?s over water splashes when max rated HP OB?s are employed, while combo runs at full throttle and comes to an immediate sudden stop...
  15. Sea Rider

    Web Slowness Issues.-

    Was wondering if Iboats forum page has been having slowness response issues lately ? Although can access general forum topics sometimes can't open individual topics including strange behaviour. Happy Boating
  16. Sea Rider

    Tohatsu 2 Strokes 8 to 9.8 Conversion.-

    Is there someone who has done this conversion, if so, share your experience... Happy Boating
  17. Sea Rider

    What is causing cavitation?

    Some issues : If you can see the anti ventilation plate exposed (X) while combo rides, definitely OB sits too high, produces too much prop aeration/ventilation Ideal transom/OB height is when water flow at speed skims right under front border (*) and water deflector plate (green line). Perform...
  18. Sea Rider

    2 Strokes Yam 25 HP

    Was wondering if any out there has made a prop maximization going from a factory delivered 13 prop pitch to a 12 on a 14-15 footer light boat. If so, how many + wot revs were achieved comparing both pitches. ? Only checkable with a tach. Happy Boating
  19. Sea Rider

    what pitch prop would you recommend?

    Go for a wot spin on flat calm, no wind water cond. Parameters : -Deck weight must be evenly distributed -Trim for boat and Anticav Plate to run parellel to water level at speed. -Once on plane pull head out transom and check where is water flow at speed passing by through lower tail. -Ideal...
  20. Sea Rider

    Picture of your test-tank

    Moons back used to test, flush portable OB's on a wooden stand while lower leg sat inside barrel, just good for slow, fast idle runs at neutral. There's a lower spout on lower barrel to discard oily water nicely. Once done simply pivot OB up and remove barrel from lower leg. Now use only...
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