I have about 170 hours on a 2000 500 EFI.

Everything is running great and would like to keep it that way!

Besides changing the oil every 25 hours (Red Line 40) What else should I be changing and checking? I have heard valve springs? What about spark plugs? Fuel filter? Impeller. Have had the boat for the last 50 hours and don't know what was done before.

THANKS!!

Just trying to keep my holidays happy!!

Routinely, every 200 hrs, give or take, you change the lifter's and spring's, and maybe the roller rocker's. Plausible to do a compression and leak down test's at this time, to make sure you don't have a bad valve or bad/ broken ring's. There is also a steel high pressure fuel filter on the left rear of the engine, which seem's to get neglected quite often. Plus all your routine items in the ignition system, and fuel system. And yes probably the impeller along with the housing too, just for good measure.Up top , the throttle body should be inspected for coaxing, or sludge build up, and it wouldn't hurt to have the injector's sent out for cleaning or replacement, seeing that all these item's are accessible at this time during a job of this extent.

The 500 EFI is a sweet engine isn't it? It responds well to good maintenance too!

Your raw water pump impeller is good for about 150 hours or one season.
I usually change the water separators along with the oil filters. If you're running regular spark plugs, I like NGK by the way, 75 to 100 hours is about all for peak performance. If you have the AC/Delco platinum, you can leave them in longer.

If you're running in salt water flush often and watch for salt corrosion at the front of the intake manifold water passages behind the thermostat housing. I spray my whole engine down with CRC 6-56 or WD-40 after every use. It's a pain, but worth the effort. Watch for little cracks in the belt grooves and replace when they show-up.

Hope this helps..Good Luck!





"No Man is Totally Useless...Even a Watch that Does'nt Work is Right Twice A Day!"

What Monsta said!! Perfect advise!


One other item to check I had a problem with is the manual fuel pump (if equipped) . The diaphram can start to leak, allowing fuel to enter the fuel pump drive shaft ( cam shaft) compartment. this compartment is filled with oil, and if the pump is leaking, it will contaminate it with fuel, and over fill it to the point it will start to leak oil/fuel mix from the pully seal! If you follow me so far?

An easy check, one that I do often, is to remove the top plastic plug from the oil compartment and check the level. if it is over fill, you can either smell it for signs of fuel, or allow to drain to normal level, and check again after a couple of hours running. If the level goes back up, then its time to change the manual fuel pump. easy job too.