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  1. M

    Converting Yamaha exh manifolds and risers to mercruiser??

    I have a 4.3 v6 Yamaha. I will soon need to replace exhaust manifolds and risers due to age on them. If you can get the Yamaha parts they are over $1800 or more for the set. You can get the mercruiser for well over 1/2 the price. Has anyone else tried to do this conversion. I have seen it...
  2. M

    Overheating Yamaha 4.3 FIXED!!!!!

    Finally got overheating problem taken care of. I am the third owner of this 96 cobia ski boat. Apparently the first ower had an impeller to come apart. Found that some of the vanes and debris from old impeller had worked up through hose to powersteering cooler where it stopped the screen up...
  3. M

    4.3 YAMAHA I/O OVERHEATS

    Engine overheats at cruising speeds. Does not overheat at idle or when going very slow. Any advice would be helpful. After cruising for about 4 or 5 min temp will go well above 175 when stopped and let idle temp will fall back to around 125 or less in about three minutes.
  4. M

    4.3 YAMAHA I/O OVERHEATS

    Engine overheats at cruising speeds. Does not overheat at idle or when going very slow. Any advice would be helpful. After cruising for about 4 or 5 min temp will go well above 175 when stopped and let idle temp will fall back to around 125 or less in about three minutes.
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