How do we adjust the valve clearance for our outboard motor?

Question

The outboard is a 2003 Honda 4-stroke 25 hp -- Serial Number BF25A/BF30A

Answer 1

The mechanic will take a feeler gauge and place it between the valve and rocker and tighten a bolt until the gap is within specs. If you or "we" know how what the rocker arms are and what the specs on the valve clearances should be it could be something that you could do yourself. Being such a new engine I wouldn't chane it though, a lot of the newer engines are designed that if one of the valves is off too far it could slap the piston on the way up...and the engine basically turns to shrapnel inside.

Answer 2

The second answer is probably correct. Most 4-stroke engines I have adjusted you use a feeler gauge. My chevy truck can be adjusted running with Valve Covers off. I have these clips that keep oil from flying everywhere loosen until the tap, then tighten until they stop, then I think it a ¼ turn more to tighten. I read my manual to be sure.

IF, you going to work on your own engines I would suggest you get a manual. For outboards they about $40-50 and will pay for themselves in Labor Cost.

You can find them on Amazon.com, but, I have found with shipping they just as cheap at the boat dealer. The one I have for Evinrude/Johnson is made by "Clymer".

Answer 3

if you have to ask, you're not qualified to do it.  that's better left to a pro.