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Recently did a compression test on my 35hp johnson. Both cylinder are about 140 psi. So once the gauge stops at 140 it slowly drops back down. Roughly about 20psi the first 5 seconds after topping out at 140. Is that normal or is it something I should be worry about?

You were right Blunt, I call him and he told me thats what he did. Got the intake manifold and carb from a 35hp and that all the 20/25/30/35 uses the same block. I'm relieve to know I didn't get cheated. Anyways thanks for the replies fellas. I'm new to this boat and outboard thing, so there's...

Thanks for the input guys. As one of you point out that since its rebuilt and converted to shortshaft. The model number on the mid section will be different from the powerhead. I look and this is what I got from the powerhead, J25TECTE. Did he rip me off . So this is actually a 25hp motor...

Just wondering if my johnson has a wrong motor cover or is this how it came from the factory. Its a 1983 35hp johnson long shaft converted to short, and the cover says 30hp. The guy i purchase it from owns a outboard shop. He says these 30 and 35hp johnsons are identical.. I want to switch out...