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  1. Sea Rider

    Gas hog?

    In order for that M70 OB to deliver full horses out need to : Test on flat, calm no wind water cond. Distribute deck weight evenly. Go for a wot spin. Trim OB for combo to ride parallel to water level when on plane. Have someone pull head out transsom. Check at which lower leg height is middle...
  2. Sea Rider

    Cylinder Head Bolts.-

    Cleaned all bolt's threads inside powerhead to immaculate cond. Now you can screw bolts with hands near fully in. Both mating surfaces were cleaned to smooth perfection, installed a new head gasket and torqued it to 25 NM. A slight coat of OMC Triple Guard Grease was used as of previous OB...
  3. Sea Rider

    Engine Tuner vrs Carbon Guard

    Been wondering if the constant use of Carbon Guard products mixed with gasoline will avoid or form less carbon layers on piston heads, cylinder head and exhaust system as well. that's what that specific product is intended for, has any one opened his powerhead to verify that really works well...
  4. Sea Rider

    18 hp Small lower unit oil leak

    Chuck, Are these the leg holes to which you are referring ? This is a Tohatsu 18 HP model 18E2, assume your lower leg is same. Won't see "clear gear oil" coming out of upper hole. Remove prop and confirm there's an gear oil leak through prop exhaust or through lower water drain, If...
  5. Sea Rider

    Cylinder Head Bolts.-

    Thanks Scott Yep, the bolt store told me what exactly you have posted about SS bolts. OEM bolts are impossible to get , will need to be imported and that's the route don't want to follow, will stick to what can be found locally. Have bought 10 standard dark color fully threaded ones grade...
  6. Sea Rider

    Flushing Tohatsu OB's

    This 2 year old 18 OB is in mint looking and working condition... As we say down here..Outwardly Flowers, Inside Tremors....Pics speak for themselves. Will need lots of hand labor, time, patience to rebuilt that 18... Happy Boating
  7. Sea Rider

    Cylinder Head Bolts.-

    Need to replace all 10 cylinder bolts on a Tohatsu OB, are completely oxidized, rusted, although could be cleaned would preffer going for new ones. Was wondering if it''s ok and safe to instal SS ones as opposed to standard ones which seems are cast iron. Any thoughts ? Happy Boating
  8. Sea Rider

    Flushing Tohatsu OB's

    Although you can flush your OB with fresh water as long as you want using any of the 3 mentioned flushing methods, running hours will be decisive in the condition you will finally find internal cooling water passages, thermostat when opening the Pandora Box. This is what was found when...
  9. Sea Rider

    Flushing Tohatsu OB's

    My beloved 18 is undergoing a 600 hour full preventive maintenance, it's correctly flushed after each outing on muffs, for at least 10 minutes, while engine is on running at fast idle. Assume all Tohatsu owners flushes their OB's after use specially the ones used on salt waters. If so share...
  10. Sea Rider

    Is there any way to get a little more HP out of a NS40C?

    Hi Randy, Hope you had a wonderful 4th of July and were able to check what suggested. In order to have spot on timing advance sync, will need to check these 2 pics which corresponds to the upper and lower throttle mechanism. Pics explains by itself. Although both pics are not from a 40C...
  11. Sea Rider

    Fuel stabilizer and E-0 advice needed

    Going back to OP original post, you should whenever possible run non E fuels, up to you if wanting to stabilize small portions of fuel leftovers on portable tank while winterizing. I personally like running fresh fuel as generally consume most of it for that particular outing. E fuels distorts...
  12. Sea Rider

    Is there any way to get a little more HP out of a NS40C?

    Have found after installing some Tohatsu outboards, they were not performing as expected, were factory delivered with carb and timing advance out of correct sync, which made all the boating fun difference. This is a simple procedure to check if carb/timing advance are spot on for best top...
  13. Sea Rider

    outboard sucking air on plaining

    You have a rebadged Tohatsu 15 Hp OB as per seeing lower leg shape, excellent OB. Have you read the link sent ? need to concentrate on the second post titled Boat Balance, read if fully, duplicate that test on yours. You can have 3 issues : Spun prop hub ? OB transom height does not match well...
  14. Sea Rider

    15hp is too much for a little SIB

    Moons back (1996) used to own a Zodiac made OMC-305 powered with a Evi 96, 15 HP OB, top air inflated with gauge performed very nice, had an excellent factory OB/Transom height match, combo flew with 2 on flat calm no wind water cond. What disliked, probably same as the Tropik 305 was bow tube...
  15. Sea Rider

    Another Zodiac came apart

    This is a clear example of inflatables you should stay away from buying, much worse if been warned about it. Buyer went straight to this catastrophic 3 K $ purchase, installed a center console, driving wheel and remote control at an extra cost to find latter before going on its maiden voyage...
  16. Sea Rider

    Is It Safe.-

    Is it safe to mix 50/50 % of 2 different gear brands oils leftovers, both are SAE 80-90 API GL5 car transmission gear oils, Could there be any form of lubrication incompatibility for gear case to wear faster? or no issue at all being same SAE and API ? Happy Boating
  17. Sea Rider

    Tohatsu 5 HP Issues.-

    Paul, a Tohatsu special for you.. 1-My 2 strokes 5 HP engine is only achieving 4700 wot rpm on a 340 mtr small Rib with one up and lightly loaded, prop is a 7 pitch, with 2 up can rev as low as 4300 rpm lugging it. Wot rpm range is 4500-5500. -Question, should I go for a 3 blade 6 pitch which...
  18. Sea Rider

    Propping help with Jackplate!!

    It's always cool to experiment by oneself, but will need a starting point from where to dial the correct OB/transom height. To start combo troubleshooting would recommend the following. -Need to check at which lower leg height is water flow passing at plane. -Remove jack plate and sit OB on...
  19. Sea Rider

    2002 nissan ns25c3 lower unit interchange

    Welcome to Iboats, Is it same as this pic ? Want to replace a Merc long shaft for a Nissan/Tohatsu long shaft lower leg, right ? Happy Boating.
  20. Sea Rider

    Lets Talk About..

    To skip the usual Sib-Rib talking of this nice section, will ask about the most strange event, weird episode, animal boating with or funny character encounter while boating.. will share 2, each one, one of its kind. Happy Boating
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