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  1. H

    Sound Attenuator Cover Screws

    1991 2.5 litre 200 hp Merc. How does one install the bottom four screws? The lower cowel blocks access.
  2. H

    2.5 200 hp heads

    I pulled the heads, cleaned the surfaces and I am basically ready to reinstall them. I see the torq spec is 30 ft-lb plus 90 degrees with lubed bolts. Then I saw this posting saying to warm the engine then let it cool, then loosen and retorq. Is this what people do? It is 22 degrees in my...
  3. H

    Pressure sensor for a 2.5 litre

    Nope. It is a blind hole (thermal well?). When I pull the heads (waiting for gaskets) I will see if I can drill into the water jacket through the side of the thermal well. In hindsight, the blind hole is obvious on the other head.
  4. H

    Pressure sensor for a 2.5 litre

    The thermal air valve port looks like a good spot. The valve is not in use. What do you think?
  5. H

    Pressure sensor for a 2.5 litre

    I want to add a water pressure gauge to a 2.5 litre 200 hp Merc. It has been suggested that rubber hose between the two thermostats is the place to take the measurement from. I am not convinced. It appears to me that when the engine is cold and the thermostats are closed, that there is no flow...
  6. H

    2.5 200 hp heads

    Thanks. Gaskets are ordered. I am still investigating the spark advance box. it is not clear how to set the timing.
  7. H

    Hydraulic Steering

    I wondered if it was the correct part as well, but it looks exactly like the one in the parts diagram. Turns out the part was deformed. I corrected the bend and cut about 4mm off the hook end. It now works. Rust. The latch has a notible loss of material from rust. The swing arm also has lost...
  8. H

    2.5 200 hp heads

    More info: It is a 1991 2 stroke 2.5 -200 Compression 115 on bottom left and 120 on the other 5 cylinders
  9. H

    Hydraulic Steering

    1991 Merc 2.5 litre 200 hp I installed the hydraulic cylinder on the motor with the powerhead removed. When I went to reinstall the bottom cowels I found that the hydraulic steering slide plate blocks the rotaion of the front cowel latch. Is there a known solution to this problem? Modify the latch?
  10. H

    2.5 200 hp heads

    I just bought a 1991 2.5 litre 200 Hp V6. While going over it, I noticed this rust stain at the top of the left head. It looks like it is coming from the gasket. Should I be concerned? Should I pull the head? What am I looking for?
  11. H

    2 Stroke 200 Hp cylinder damage

    Any thoughts on why? Headgasket failure led to hydrolock?
  12. H

    2 Stroke 200 Hp cylinder damage

    1987 Yamaha 200 Hp 2 stroke. Piston broke at the wrist pin then got pounded by the connecting rod. Note the rust in the top part of the cylinder. If you zoom in on the cylinder you can see that two of the transfer port passages are completely opened up, Both the steel sleave and the cast...
  13. H

    Fuel Recirc ??

    I am curious about the fuel recirculation pipes. How do they work? They are old (37 years). What affect would it have if they were cracked or leaking? Motor is a 200 ETLH.
  14. H

    Carb question

    I agree, but the motor was running so well. Good idle and 70 mph at 5500. Would I know if one cylinder was starving?
  15. H

    Carb question

    1989 200 ETLH. When I drained the carbs for the winter, the lower port side bowl had no fuel in it. The other 5 bowls had fuel in them. The motor ran fine last time out which was about a week ago. How can one bowl be empty?
  16. H

    70 HP Johson 2 Stroke Can go faster?

    3 thoughts: Does it have the appropriate size propeller? What's the rpms at WOT? Is the boat heavy? Waterlogged? Water in a "sealed" compartment? Is the speed measurement accurate?
  17. H

    Lower Unit Leaking

    Upper arrow shows rubber hose for speedo pitot. I think. I cannot find another hole in the lower unit that could be the pitot hole. Lower arrow shows the hole in question. Notice the channel in the case leading to the hole is clearer in this picture. (I have a Yami 90. Pitot is in the...
  18. H

    Lower Unit Leaking

    200ETLH - new to me found water in the lower unit So I drained it and refilled it. Planning to deal with it before winter, Later I notice oil coming from a hole on the side of the lower unit. Is this the pitot for the speedo? Any ideas what the issue might be?
  19. H

    What Year is my motor

    Just got a 2 stroke Yamaha 200 Hp. Having trouble identifying the year. There is no date tag on the right side clamp. The info tag has the following: 200ETLH 6G6 L
  20. H

    Triumph Carb Questions

    I am cleaning a set of carbs from a 1972 65 hp. When I removed the low speed needles, one needle brought out the NEEDLE VALVE BEARING. The other 2 did not. Is there a technique to get the other 2 out so I can remove the jets? Also, I have a set of carbs from a 1974 70 hp. They do not...
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