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  1. Sea Rider

    Dt65 oil injection

    Oil check valves are replaceable, the issue is trying to remove them when have already been molded to the internal rubber hose, can replace the whole hose and install a new check valve at their specific end, check the valve sits at its correct working position when installing it. Other...
  2. Sea Rider

    Tohatsu m25c3 2-stroke compression high on one cylinder

    Have tested many motor's cylinder compressions before and have never seen such described scenario. The Service Manual doesn't mention which compression brand and model it's used at the factory. My 18 horse factory specs calls for near 107 PSI, but after 1K run hours dials when cold tested 115...
  3. Sea Rider

    2013 Yamaha 25hp 4 stroke running hot

    If water is seen accumulated on the pan seems the engine base gasket is dried, burned, shot, retorque all lower bolts located at the upper portion of the midsection, With motor running if the water leak stopped fine, if didn't will need to install a new base gasket. Check for any other possible...
  4. Sea Rider

    Tohatsu m25c3 2-stroke compression high on one cylinder

    Can't possibly have double PSI reading between both cylinders, did you made the compression test after the motor was warmed up for min 3 minutes at idle on muffs, barrel ? If not, test again as stated. Don't squirt nothing into the cylinders... Happy Boating
  5. Sea Rider

    Cylinder Compression Incongruences.-

    It's useless trying to find 4 feet to the cat when only has 3. As stated before never have had issues with 2 stroke Tohatsu motors. This highly illustrated thread is all about bringing to life a motor that was on its way to become a large anchor, your posted comparisons and associated...
  6. Sea Rider

    2018 Yamaha 25 hp. 4 stroke will not run at slightly above idle.

    Motors that comes with installed factory props, don't know if this the case are generally medium pitched, good for break in periods, soon after need to prop right the motor to run towards max wot rpm range, much better if propped right for fixed or near fixed loads. Happy Boating
  7. Sea Rider

    2018 Yamaha 25 hp. 4 stroke will not run at slightly above idle.

    Is this motor a tiller steering or remote model ? How loaded do you usually go boating with ? Need to prop right the motor to run towards its max wot rpm range factory stated. For that purpose will need to install an induction tach, go for a wot run on flat calm water cond and report what's the...
  8. Sea Rider

    Cylinder Compression Incongruences.-

    The piston's ring locating pin sits in place. It's impossible for a ring to break while running, never have seen such scenario in more than 13 years working with Tohatsu motors. Can seize a piston and piston ring ring but not break it due to poor lubrication, forgot to add oil to the fuel which...
  9. Sea Rider

    Thermostat impellor question

    Measuring the temp at the cylinder head or exhaust cover it's relative, if that 50 year oldie motor was run in salt water surely will have reduced water passages and cool bit less. For the same reason will operate at a higher temp compared to having immaculate clean passages as when out of the...
  10. Sea Rider

    Carburetor

    If only swapping just the carb, go for a prop maximization to less prop pitch to pull wot revs up to max wot rmp range. Will better the current hole shot and achieve a slight more top end speed. Must install an induction tach for that purpose. Check here at Iboats store how many less prop...
  11. Sea Rider

    Carburetor

    Used to have an Evi 96 which was converted from a 9.9 to a 15 HP one, aside the 15 HP carb swap, per factory recommendation also swapped the complete reed valve assy which has larger orifices and side gaskets as well due to breaking them when removed. Being my ex motor and yours close years...
  12. Sea Rider

    Cylinder Compression Incongruences.-

    Nope, the issue with this particular motor is that other shade tree mechanic took it apart for a supposed maintenance, gave up, returned it boxed in pieces and the last pseudo mechanic reinstalled everything back in. No new parts were installed. Lessons learned don't trust any non certified...
  13. Sea Rider

    Thermostat impellor question

    Could be possible, to be 100% sure test the motor with lower leg submerged in a barrel that way the water pump will work on his own.. Happy Boating
  14. Sea Rider

    Cylinder Compression Incongruences.-

    After two hours work disassembling the whole powerhead what was found was not to my complete satisfaction. This nice motor has suffered from 3 proven facts : the previous shade tree mechanic broke the front piston ring when assembling the piston into the lower cylinder, although the upper...
  15. Sea Rider

    Thermostat impellor question

    Being a 50 year oldie definitely both, water pump or impeller alone depending on liner condition and thermostat as well. Will cool much better. Happy Boating
  16. Sea Rider

    2002 Tohatsu 25hp 2 stroke won’t start

    Adding little more oil isn't the same as running 25:1 right after the new pistons were installed which the factory recommends going for. Did you installed oversized pistons and ringd after boring both cylinders ? The cylinder head was mandatory to tear, decarbon, clean the internal water...
  17. Sea Rider

    Cylinder Compression Incongruences.-

    Pulled the cylinder head this morning, luckily didn't break any bolt. There's a deep scratch seen on the lower cylinder at around 7-8 o'clock and not that much around 2-3 o'clock while the upper cylinder it's immaculate clean. Seems the previous pseudo mechanic broke a piston ring while...
  18. Sea Rider

    2002 Tohatsu 25hp 2 stroke won’t start

    Under no circumstance should you run wot any motor specially if with new pistons, piston rings and cylinder bores. Forgot to do a new 10 hour break in period with 25:1 fuel/oil ratio mix ? That's a 19 year oldie and I'll bet the cylinder head and exhaust gaskets have never been re torqued to 25...
  19. Sea Rider

    Carburetor question on restoration I’m working on 1992 40 hp MSHQ Yamaha

    I'm plainly in agreement that fuel pump it's not attached to the lower carb, pics in post 16 shows it all. Must have clicked by mistake the Tohatsu 40 HP spare parts page which lives side of the Yam's 40 page. Let the one who has never had a senior moment to cast the first brick..... Happy Boating
  20. Sea Rider

    Carburetor question on restoration I’m working on 1992 40 hp MSHQ Yamaha

    Yep the consensus states to get rid of the EPA tank and fuel line or at least test as indicated in post 13. After removing the spark plugs to check their condition, perform a cylinder compression test if countig with a compression tester which don't remember if was previously done ? Happy Boating
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