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  1. dandreye

    2-stroke 90hp: check valve orientation in crankcase cover

    Hello All, In my 3-cyl 2-stroke carbed Merc 90hp made in 2000/01 there are 3 tiny metal check valves each with a nylon ball inside. They reside in black plastic holders installed in the crankcase cover (each at the corresponding crankshaft bearing). Can someone please confirm which way their...
  2. dandreye

    Suzuki DF90 vs Yamaha F80/F100

    All, Weight of these engines put aside, is a Suzuki DF90 any better choice than a 4-stroke fuel-injected Yamaha or vice versa? What matters most is (1) reliability and durability, (2) performance and fuel consumption, (3) ease of servicing, diagnostics and troubleshooting. My own preference so...
  3. dandreye

    Mercury 90 ignition problems

    Hello All, What else besides ignition parts (3 CDM modules, stator, trigger and regulator) may also need to be replaced in a 2001 Mercury 90 ELPTO engine that briefly sank in freshwater but didn't suffer a hydraulic impact? At present only cylinder #1 (top) runs steadily while 2 others behave...
  4. dandreye

    Mercury 90 ELPTO runs on 1 cylinder

    Hello All, Got a 2001 3-cyl Mercury 90 ELPTO serial #0P121707 (Belgium) from a boat that drowned in fresh water (the kill switch was NOT activated) and was recovered in a few hours. ALL adequate procedures were applied at once to rid the engine of the water. Nevertheless it now runs in a weird...
  5. dandreye

    Prop diameter for a Mercury 90

    Hello All, Recently bought a used boat with a 2-stroke Mercury 90hp (I think 90 ELPTO) made around 2002, w/o any documentation. Looking to buy a SS prop for it. Have seen a general recommendation on this forum to start with a 19" pitch SS prop - but which diameter? I've come across some posts...
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