Quote:
Originally Posted by FishStretcher
. . . Even with the new oil, I got that ticking in the top end once it warmed up. It ran fine on some CAM2 I had lying around (no ethanol).
Oil pressure is fine, as far as I can tell. Not sure what I can do. I think the motor has 800 hours on it. But it came off a rental boat, so it could have 2800 hours. No ECU, so I can't tell.
The outboard cost me about $1000, so I am not sure I want to tear into it unless it sounds worse. It *IS* a solid lifter motor.
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Any chance it needs a valve lash adjustment? Not an easy job if it's got bucket tappets with shims, but I understand that's required on the newer 4-strokes after about 400 hours! Makes Terry's "water cooled chainsaw motors" look pretty attractive! Excessive valve lash reduces lift and duration which will reduce max hp a bit, but it typically increases mid-range torque slightly, so if you don't mind the extra noise, it might not be worth fooling with, especially if a compression check says the exhaust valves & seats are still ok, since they're typically the weakest link in a 4-stroke!
I don't understand why they don't run full synthetic oil in the new 4-strokes, or all marine engines for that matter, as it really reduces wear. A little more expensive, but lubrication properties are so much better that it's the best thing you can do for any IC engine!