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    1998 YAMAH 115 HP BETO 2-Stroker Lubrication System Check Valves

    Hi all, I am interested to understand the purpose of the check Valves (1 per feed line from the engine driven main oil pump). A Check Valve can have one out of three different ways of "operating" 1. The normal way, allows oil to flow in one direction (towards the valve body and in to the crank...
  2. E

    Yamaha F150 Two Stroke built year 1999

    Hi, I have just bought a motorboat with an Engine with an known issue but the cause is not found. It starts up fine but it makes a metallic scrambling sound that of course does not sounds good. I know that it could be "anything" and its is inmpossible to tell without more information but I...
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