Coomes4

Update... I switched out my fuel line to a portable tank. Added a can of Seafoam to the portable tank, in case of possible carb build-up. Ran the motor on idle for about 45 minutes. Took out for a test drive, there appears to be performance improvement, however it still won't open up. It doesn't "kill" but it wont get past 2800 rpm. I'm frustrated and want to row it out to middle of leech lake and perform a sinking. My guess now is something electrical in the motor.

Looking for some help/advice with my engine problem. 2002 Yamaha 50hp 4 stroke Forgive me in advance, as i'm a weekend warrior that sadly uses my boat about 6 days per. I'm not mechanically inclined, i'll describe as best as I can. Starting the boat - turn key, chugs but doesn't fire. I engage the neurtal button (in middle of my hand throttle) push throttle about 1/4 way and turn key. Engine starts right up. Move throttle back to neutral position, the engine seems to be "shaking". Not a violent shake, but it is noticible. Engage the throttle in reverse, it works properly. Engage throttle in forward, it seems to work properly until i push it past the 1/4 range. Then the engine simply stops. Rinse and repeat, same results. It seems as if only 2 or 3 cylinders are firing, I put new plugs in today. The gas might be an issue, as half of my tank is roughly 12 months old and the other half was put in yesterday. I put 1/2 can seafoam in, doesn't seem to help. Thanks in advance.