A lot of guys seem to have problems like that..... makes me wonder if pressure washing the engine is to blame. It forces water in where it never should be.
At the very least, if you do pressure wash your engine: give it a good hard run right afterward to boil off any residual water lurking in the electrical connectors, coils, spark plug holes, etc. Better yet, is just to wash it with something like Hondabright, low pressure and a garden hose rinse, blow it off with an air hose or garden blower then give it the same hard run to get it hot and get rid of the water..
Just sayin'-