Ok, Iam Looking At A Boat W/ 500efi With Only 14 Hours. I Had A Comp. Test Done 150-152 Across The Board. Good. The Leak Down Was 18%on The Low Side And 26% The Highest. The Boat Has Been Sitting-up Around 6 Months. What Do You Guys Think. Also The Motors Are 2002. Thanks In Advance.

18 TO 26 PERCENT IS NOT THE GREATEST CONDITION FOR A LEAK DOWN YOU MAY WANT TO RESEARCH THAT A BIT FURTHER TO SEE WERE THE LEAK IS GOING IF ITS PAST THE VALVES ITS NOT TO BAD A VALVE JOB WILL MOST LIKELY FIX IT BUT IT MAY BE FURTHER INVOLVED.HOPE THIS SHINES A LIGHT LAZ MESA WWW.MESABALANCING.COM

That is bad leakdown for a motor only having 14 hrs on it. Last winter I did leak down on a motor that I run on the edge of detonation with 10+ lbs of boost & worse was 15% after 100 hrs.

I see all kinds of red flags on this one. I wouldn't expect to see 26% on that motor after 240 hours.

I Think It Is Due To The Time The Boat Has Set-up. Could Rust Have Got On The Values And Caused The Values Not To Seal. And Would Running The Boat Blow The Rust Out And Fix The Seal Issue.

i was always told a cold leakdown test is a 1/2 step above useless. The engeinmust be at or close to operatign temperature so everything will seal right and not leak.

anybody else..............................thanks

I agree, change the oil and filter first, put some time on the motors under load and then recheck the leakdowns on warm motors. If its just a little valve seat rust it will probably improve a lot. If it does not then squirt a little oil carefully in each cylinder and retest. If it then improves a moderate amount you've probably got ring issues and if it is still higher than 15%, you've got a major rebuild in order and the boat should price accordingly.
Raylar

Leak down the engine while still warm.

yes, the leak down was done when the motors were cold............also the compression test was from 150-160. its hard to see why there would be a issue with the motors with only 14 hours.