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  1. Sea Rider

    Help with prop selection (with numbers!)

    If flow is passing right at middle of both plates will have good water performance at straight water courses, but prop will aerate at close tight turns, much worse under choppy, windy water cond. If wanting top water performance lower OB if possible till flow matches blue line. If wanting going...
  2. Sea Rider

    Good or Bad Idea.-

    Was thinking in removing my powerhead from base along removing all cylinder head bolts not all 8 at same time, say one by one, clean all threads, slight coat with Permatex anti-seize lubricant, put back and re torque to specs. Could even go further as to replace a new cylinder head gasket...
  3. Sea Rider

    dory 11ft and yamaha 9.9hp

    Is water still lodged inside hull ? good to have moved center console up further, when boating alone will be much better to get out of the hole faster at full throttle. Try to duplicate on your Yam lower leg for water flow blue line) to skim right under the yellow line. What like about Yam...
  4. Sea Rider

    2014 Yamaha 25hp Alumacraft Prop Choice

    If OB produces back or over transom water splashes, definitely will lower max wot rpm achieved due to excessive water drag. Check if with issues at back transom. Report your findings... This is what you need to dial for OB to rev happily, from there can go for a prop maximization to a 8-9...
  5. Sea Rider

    dory 11ft and yamaha 9.9hp

    Andre, Found a Yam lower leg... That's the Tip Top OB/transom height your Yam needs to work well with the least possible drag on lower leg, once dialed go for a wot spin on calm water and check how does your new prop performs with 2 up, sit one up front to have a well balanced combo. Report...
  6. Sea Rider

    Help with prop selection (with numbers!)

    Your post is a prime example going for the “nonsense rule” that states that AV plate must be even with lower keel/hull, the only thing that has rendered so far is a catastrophic water result. This rule says nothing, it’s only a dry installation that does not take in the least account at which...
  7. Sea Rider

    Inexpensive 2 Cyl. Tachometer review (On-Going)

    When ordering Hardline Hour-Tachs need to know fully in advance number of cylinders OB has.... Installed a 8061-2 tach on a 1cylinder OB, when the spark firing was set at 1 pulse per revolution read double count, finally was set at 2 pulse per revolution to read right, don't ask me why read...
  8. Sea Rider

    Aluminum board for benches?

    What about a wood seat custom cut at a carpentry shop to desired size, will need 2 extra lower seat hooks that could buy separately if locally available. Happy Boating
  9. Sea Rider

    Help with new engine ventilation/cavitation issue

    This post should clarify prop aeration/ventilation issues. Check modified pic... You need to match water flow shape exiting under middle box for it to skim right under protruding lip and consequently under upper water def plate. If OB sits at 90? and having aeration/ventilating prop issues...
  10. Sea Rider

    2005 Mercury 2 Stroke 25hp Needs New Prop, Expert Needed Please

    Does pics matches your Merc 25 HP ? If so, it's a rebadged Tohatsu, can convert it to a 30 HP for candy cost. With an OB/transom Optimization & Prop Maximization will make al those horses to run out of the barn fast. If matches, a 13 pitch is over pitched, will need to go down to at least...
  11. Sea Rider

    Prop size??

    Are you 101% positively sure ?....this is what boats/engines manufacturers recommends, have check them all... Also applies when out of the hole... Happy Boating
  12. Sea Rider

    Prop help?!

    Try the following to the letter : Distribute deck weight evenly or sit a boating mate up front to balance combo. Manually trim OB to sit at 90?, that's perpendicular to water level. Go for a wot spin on flat calm water, once on plane, Pull head out transom to check what's going on at rear...
  13. Sea Rider

    Help with new engine ventilation/cavitation issue

    Sound means that OB sits on transom while AV plate is even, flushed with lower keel/transom ? If so, a bad way to start boating. That setting means nothing, if OB sits and rides at 90? while deck weight is evenly distributed, OB sits too high, less water ideal height for prop to grip as is...
  14. Sea Rider

    mercury 25HP strange occurence... prop?

    Gee don't understand why boaters like giving wrong advise, "NO" OB brand Owner's Manual that have read, and have read them all states AV plate must be even with rear keel/boat's bottom. This is a fallacy invented somewhere, the height will vary depending on the HP, more on portable to medium...
  15. Sea Rider

    Vaccum Gauge.-

    If in need to install a vaccum gauge on a 2 strokes single carb Tohatsu OB as there's nothing to connect it to. Will drilling a hole right in middle of intake maniforld and pressing a metal tube inside will work ? Would be cool to count with one to adjust idle's air/fuel mixture right on cue...
  16. Sea Rider

    mercury 25HP strange occurence... prop?

    Ok if tach is reading correct at least idle rpm, would you say that when tach was jumping numbers on display, was doing same with audible to the ear wot rpm, or wot rpm's were stable and even ? Personally would be scared going for a huge prop maximization with a tach that doesn't count with...
  17. Sea Rider

    multimeter?

    Assume that all other OB brands must troubleshoot their electrical ignition systems with DVA Volts capability multimeters. For that matter, Electronic Specialties Company has released an adaptor model 640 that can be plugged to any digital multimeter to read peak DVA Volts on outboards ignition...
  18. Sea Rider

    Outboard height

    Before venturing unbolting and moving OB up, need to determine by visual inspection where is water flow passing by through lower leg. With weight evenly distributed, trim OB well for hull to run parallel to water level at speed. If not it's a wild guess playing moving OB blindly, those OB's are...
  19. Sea Rider

    1998 Nissan 18hp

    Need a nice tach, don't invest on those cheapo induction tachs that don't have spark adjustable capability. Go for a Hardline HR-8061-2, are well priced, check Iboats, Amazon for them. Remove prop, turn up side down, draw a straight line across middle sub as in pic, re install prop, go for a...
  20. Sea Rider

    Outboard height

    OK, let's provide a good technical solution to OP's boating problem, that's what this nice forum is all about.. Is your boat is something like this ? aft hull doesn't meet transom at 90? like standard boats ? Happy Boating
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