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  1. J

    Dentonation (89 Evinrude 90 HP VRO)

    What can cause dentonation in just one cylinder? It happened just after I had someone rebuild the carbs (#3 piston) and now after the rebuild, it happened right away on the #1 piston. The ignition coils may have been swapped during rebuild. <br /><br />I thought at first that it might be bad...
  2. J

    Dentonation / spark plug choice Evinrude 1989 90HP VRO

    1989 90HP Evinrude V4 VRO<br /><br />Last year I had my water pump replaced, timing checked/adjusted, linkage set, and carbs rebuilt. The mechanic put in Champion QL78YC plugs, which are standard arm-gap plugs. My manual lists Champion UL77V, a surface gap plug, as the correct plug. I had...
  3. J

    1989 90hp Evinrude Transfer Port/vacuum hoses

    Okay, I admit that my friends and I pulled a newbie error--when stripping the engine down for rebuild, we mixed up the transfer port covers. 2 of them are different in that they each have a nipple for a small hose (vacuum hose?) that runs back to the carbs. The carb ends of the hoses were...
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