outboards

[Blubyue]

Anyone have an idea why when i give my 8hp yamaha outboard throttle, it just dies?

Lots of research done already and came up with nuttin.

[trlcavscout]

Anyone have an idea why when i give my 8hp yamaha outboard throttle, it just dies?

Lots of research done already and came up with nuttin.

Does it have a fuel filter? Could be fuel related, timing, or ignition. Does it just die instantly or sputter?

[UncleDave]

Could be bad fuel or a gummed up carb. Remove the spark plug, clean and clean it. Then squirt some starter fluid in the spark plug hole, a good 2 second burst. Re-install the plug and fire it up, slowly giving it more and more fuel until you can get full throttle. It may take repeating these steps a few time to get it. The other thing to check it the air filter and make sure you have good air flow.

[Blubyue]

Air filter????? uh ohh

[rockhound]

flooding? fouled spark plugs

[glenncal1]

Dump the gas in the carb, it could be water in the float bowl

[wrestler034]

Run some Seafoam through it. It really helps clean up the varnish out of the carb. If the carb is too gummed up it will require a carb rebuild. Do you have good compression? Replaced the spark plug? In my experience, when an outboard dies when throttled up it is because the motor was stored with gas in the carb. Make sure you add fuel stabilizer to the gas when you fill the tank if you plan on not running through the complete tank within a few months.

[ben4372]

Run some Seafoam through it. It really helps clean up the varnish out of the carb. If the carb is too gummed up it will require a carb rebuild. Do you have good compression? Replaced the spark plug? In my experience, when an outboard dies when throttled up it is because the motor was stored with gas in the carb. Make sure you add fuel stabilizer to the gas when you fill the tank if you plan on not running through the complete tank within a few months.

Seafoam is good. the rest is good advice too. haven't had a carb problem since I've been using Stabil.

[XC700116]

Most likely a plugged passage or jet in the carb from your descriptions but it could be electrical too.

If you're confident in your mechanical skills the first thing I'd do is dump any old gas to start out with fresh. Then clean the carb thoroughly. I'm not talking about the outside of it either. Complete tear down and clean every passage and jet in it.

There's a really good trick for getting old varnish out of carbs. Pine-sol. Yeah I know it sounds retarded but it works like magic.

Tear is down completely and soak all the pieces except paper gaskets in a 50/50 mix of pine-sol and water over night. Then rinse in the morning with HOT water. Before assembly use isopropyl alcohol to do a final rinse to absorb and dry out any water residue and blow it dry with compressed air. Replace gaskets as necessary and reassemble.

Put fresh gas and spark plugs in it and fire it up and see if it runs. if it doesn't it's not the carb, it's most likely electrical.