delboatdr

Anyone think to ask what it is idling at in gear? Last years gas should be removed and replaced before attempting any other repairs. Just an fyi from a certified Mercruiser tech. Ethonal has a shelf life of two weeks before it begins phase seperation for which there is no cure and no saving gas, at that point it will really effectlow rpm running.

This post is a good reason why you should have a qualified technician work on your boat. AT 220 HOURS, it should have had more than just spark plugs and filters.

Sounds like blow by or crank case leakage. I preach this to all of my customers, use Yamaha ring free in every tank of gas. Unlike the stuff you get at the auto store, it really makes a huge difference in the carbon build up in these motors, especially 115 four strokes. What ever you do, do not put a crankcase flusher in your outboards unless you want to buy a new pair soon. Just advice from a 12 year certified Yamaha technician.

Eay one. Not enough voltage to the ignition system and it causes poor spark resulting in poor combustion. Also if it runs long enough, you are just running off of your battery and will kill it very quickly. Cleam all your connections and used dielectric grease to prevent corrosion. DO NOT USE VASALINE! Jon

Being a Yamaha tech for twelve years now, it amazes me how many people are willing to take a gamble and not have their engines serviced by a highly trained professional. Not saying that the average boat owner is not capable of changing their oil, but 100hour service intervals are alot more than the fluid change. Tourque checks, timing belt and tensioner, compression test and how about running computer diagnostics to check for unseen issues. You can also rest assured that when a Yamaha outboard goes to the dealer for service, it's serial number gets run through their dealer system and automaticaly checks for recalls and updates. The amount of comments alone about sucking the oil through the dipstick hole are scary. Remeber that all the crud ends up in the bottom of your engine where your drain plug is. If you "suck" it out, you are leaving debris in your engine and might as well not have even changed the oil. You also only want to use Yamaha oil, biggest cause of power head failure on their four strokes I have seen is from the wrong oil being used. Marine oil has specific corrosion inhibitors that shelf and auto oil do not use. Youwill aslo find that if you have a problem later down the line and have dealer records, Yamaha will almost always step up to the plate, even if the warranty has expired. Please don't get me wrong, I am not trying to discount do it yourself boaters. At upwards of close to 30k for some new outboards, saving yourself a hundred dollars is not worth it in the long run. Just my two cents.