yamaha 220 no power under load

[austinfrank]

I have an 85 220 that I recently purchased that doesn't want to run in gear over 1200 rpm. This motor sat for 5 years and I rebuilt the carbs and replaced all fuel components and lines. I did get it up to what seemed full speed for 2 or 3 minutes, but then it just bogged down. Any suggestions?

 

[rbu]

Re: yamaha 220 no power under load

Is the compression good?<br /><br />If you got it running for 2-3 minutes and then it bogged down, then I would start looking into fuel related items (contamination, restrictions).<br /><br />Does this motor have the micro-computer ignition? I can't remember if 85's had this or not. You could also be overheating and the computer is slowing the engine down. Did you change the water pump?

 

[austinfrank]

Re: yamaha 220 no power under load

rbu, I haven't checked the compression yet, it is on the list, I have however replaced the impeller in the fuel pump. Engine was running cool. It does have the micro-computer in it. Engine runs fine in neutral as well,(will run all day in neutral and can rev up to 4000 rpm no problem) and will check wires and spark plug gap again. Folks have a place on LBI, and appreciate the help from the the Atlantic Coast.<br /><br />Frank

 

[BKool68]

Re: yamaha 220 no power under load

It appears that a common symptom of a motor that sits for a long period is no power under load. Rebuilding the carbs is normally the answer, but you must be certain that the high speed jets are cleaned. Try squirting some pre-mix in the carbs as you try to accelerate. If it takes off you have a restriction still. I would remove the carbs and run a piece of wire through the jets, most likely this will solve your problem.

 

[rbu]

Re: yamaha 220 no power under load

If compression is good and you're not overheating, then I would go through the carbs again. These engines usually will rev up when not under load. If you're carbs are clogging up, then you need to find out why. You are using fresh gas and a new fuel/water seperator right? And your tank is clean?<br /><br />I went through the same thing a few years ago with an 88 225 Yam that sat for a few years. Fuel contamination was the major issue in getting it running properly. <br /><br />Let me pass on a few things I learned:<br /><br />* It doesn't take much to clog up the carbs. If you do have a fuel contamination problem you are going to have to keep cleaning them until you find out the source of the problem.<br />* The older Yams did not use satinless screws inside their fuel pumps. Therefore they tend to rust which can find its way into the carbs. If you haven't changed them, I would sugget doing so. Don't bother with a rebuild kit, new ones are only about $25 each.<br />* When you change the water pump, be sure to change the T-stats and clean the poppet valve. Even if you're engine is still pee-ing water, the poppet valve may be restricting flow. Sometimes after lay up, the valve sticks.<br /><br />LBI is a great place, I hope to get a house there some day. We have family with a house down on the south end of the island.<br /><br />Good luck.