Yes, I agree "Sneezing is often caused by a lean fuel condition." Spark is great and consistent, fuel pump rebuilt and high speed jets and low speed orifices cleaned out. This engine has a mixture control originally set at 1.5 turns and then adjusted in both directions. The seals are firm and...
This post was originally from TinBoats.net The original aluminum boat site!
Outboard compression numbers
Quote
Post by cajuncook1 » 07 Jul 2011, 17:21
Well, comparing Mercury motor compression values to Evinrude/Johnson motor compression values is not comparable. That is like comparing apples...
Interesting comment. The piston diameter on these engines is less than that of a golf ball @ 1 9/16 inches. I've seen other forums where they could be in the 80's. I thought, a new engine might be as high as 110 p.s.i. for these twin cylinder 4 hp motors but I am not sure what they should be...
I need some advice. First off, this engine in an Evinrude Deluxe model # E4RDHCDE and it has great compression at 100 p.s.i. on both cylinders. Does anyone know why these engines might cough during idle? I've gone over every aspect, regarding mixture control and idle jets and float level/drop...
