Home › Forum › Ask A Member › Evinrude 28 HP SPL miscellaneous market and model questions › Reply To: Evinrude 28 HP SPL miscellaneous market and model questions
Well, it is my opinion that the recirc systems on these engines have caused a bit of an variance in the two cylinders. With the recirc systems, there is no way to obtain a great idle mixture for both cylinders. You almost would need two carbs to dial in each cylinder. The latest systems where the output of the recirc hose is dumped back into the carburetor throat seems best. It is important to remember that there are a few check valves in this system that must be checked in order for the system to work best. It is also important that the engine be trimmed out just slightly for extended idling to make sure the excess crankcase puddling is directed towards the recirc valve in the intake manifold. This can be a nuisance/inconvenience on these engines with no power trim/tilt.
Again, it is super important that these engines get up to temp at low RPMs, the warmer/hotter the better. Not to worry, the pressure relief will cool it down again at higher RPMs.