Everybody hears about performing an outboard motor compression test, and everyone knows that when you buy a used boat, you should compression test the outboard. Yamaha outboard technician Sean Stahl from Annapolis Boat Sales says a compression test will help tell you how much life the engine still has, how much wear is on the piston and the piston rings, and how much air is being pushed through the engine. Essentially the engine is a giant air pump. You want to be sure the PSI reading for each cylinder is within 10 percent of the others. To do a compression test, your outboard must be hot. First remove the spark plugs, then remove the 15amp fuel pump fuse to keep fuel from entering the cylinders. Thread in the pressure gauge hose into the first cylinder, then attach the gauge. Turn the key as if you were starting the engine and take a reading. Repeat in the other cylinders and then compare the readings. If they're all within 10 percent of each other, you're good to go. Learn more about performing compression tests at https://www.boatus.com/expertadvice/...

Enjoy this video? Become a BoatUS Member today to get 25+ valuable benefits including a subscription to awardwinning BoatUS Magazine! https://boat.us/e/syjoin

Visit the BoatUS Magazine website: https://www.boatus.com/ExpertAdvice.

BoatUS is the nation’s largest association of recreational boaters with more than half a million Members. We provide a diverse offering of services including marine insurance, onthewater towing provided by TowBoatUS, the nation’s largest fleet, plus boat financing, graphics and lettering, representation for boaters on Capitol Hill, the awardwinning BoatUS Magazine and much more. For more than 50 years, BoatUS has made boating safer, more affordable and more accessible.

Download the BoatUS App today to access NOAA marine weather, tides, exclusive Member discounts, and your BoatUS account. Assistance on the water has never been easier with TowBoatUS CONNECT in the BoatUS App — the fastest way to get a tow! https://boat.us/syapp

Connect with us:
  / boatus  
  / boatus  
  / boatus  
  / boatus  
  / boatus  
#outboard #compressiontest #boatus