Motor shaking / loss of power.. any ideas?

[HEMAN]

so the previous trip. my engine started acting up... and this past trip over the weekend.. she just didn't want to cooperate... takes a bit to start up.. but i think that could just be the cold weather..

so the motor shakes pretty bad now once it's running.. and then at full throttle.. it's not even at full power.. i would say it's running 30% .. the rentals at Skinner were passing me up... it took forever to move around...

anyone have any ideas? it's a Yamaha 15 hp 4stroke.

Going to check replace the spark plugs next.. i'm thinking maybe one of the cylinders is not firing?

I am going to bring it in for a normal service none the less.. but not sure if they will diagnose anything for me without charge... just thought i'd ask here to see if anyone has any good info.. thanks guys..

[MAVERICK27]

Just take the plugs out one by one, still connected to the spark plug wire (high tension leads) and crank it with the plug touching a ground, like the cylinder. You should see spark. You will probably find that one or more cylinders are not firing....then find where the problem is from there...could just be a bad plug...I know car engines pretty well...and that is the same diagnosis tool...

[OnDaHunt4Fish]

make sure that you check to make sure that the all plug wire are snug that could cause it *** well as the foam on the inside of the hood ...hope that helps

[GeordyBass]

hmmmmm,i think you should try checking the bulb to you gas tank?Happened to me once.Then try checking the plugs like they said here...It might be something with the fuel,magneto,pistons,or carb/injectors???(yes 4strokes have carbs,but they are different than 2 strokes)

[TRDEXPERT]

Start with the basic, replace spark plugs and wires, then try the compression test like the other fnn member commented

[yamafish]

Arghhhhhhhh...... That's my old Duroboat / Yamaha

Heman,

Take it here Johnson Marine in Ontario .. http://www.johnson-marine.com/Johnso...e/Welcome.html
Ask for Brian. He is the very best Yamaha mechanic around.

While you are there...
Go pick up some Yamaha 4 stroke ringfree from them.

If you troll all day long.. make sure before you head on back to run a couple of "hot laps"

You want a deal on a near new Crestliner I/O drive 18.5 ft?

YamaFish

[GeordyBass]

Arghhhhhhhh...... That's my old Duroboat / Yamaha

Heman,

Take it here Johnson Marine in Ontario .. http://www.johnson-marine.com/Johnso...e/Welcome.html
Ask for Brian. He is the very best Yamaha mechanic around.

While you are there...
Go pick up some Yamaha 4 stroke ringfree from them.

If you troll all day long.. make sure before you head on back to run a couple of "hot laps"

You want a deal on a near new Crestliner I/O drive 18.5 ft?

YamaFish

your a new boat,boat whore...
i'm an old boat,boat whore...

[TRDEXPERT]

Geobassmaster818
hows that boat you bought for 500.00 dollars?

[GeordyBass]

Geobassmaster818
hows that boat you bought for 500.00 dollars?

who's geobassmaster818?
i dont know of him????haha

I luv that thing!!does me well and never stalled on me...it is lucky as hell too!

[Rooster]

Arghhhhhhhh...... That's my old Duroboat / Yamaha

Heman,

If you troll all day long.. make sure before you head on back to run a couple of "hot laps"

You want a deal on a near new Crestliner I/O drive 18.5 ft?

YamaFish

Hey that was my boat also I sure miss that boat. Roger he doesn't troll,, He is a bass master.

Heman im sure its something minor, probably just needs a good carb cleaning. BTW post some pics,,i would love to see what ya did to it.