Yamaha 225 running rough and cutting out

[dcato]

My Yam 225 (1994) carbed w/ oil inj. is running rough from about 1200 through 1800 rpm's and then skips occasionally at higher rpm's. it has a newly rebuilt powerhead and i ran extra oil in the tank for break-in. it is now past that point and still running rough. i have check plugs, fuel lines, filters, etc. and plugs look good. not sure what the deal is - maybe some water got through but i've cleaned the carbs so i don't know. any help would be appreciated!!<br />derek

 

[rterrian]

Re: Yamaha 225 running rough and cutting out

I would change the plugs after running rich oil mix for break in. It's possible they can look good and not fire well under compression.

 

[Terry Harper]

Re: Yamaha 225 running rough and cutting out

Check electrical connections, particularly power supply to coils these little suckers are'nt very well insulated or waterproofed, and can corrode causing missfire.

 

[GREENBUNCH]

Re: Yamaha 225 running rough and cutting out

Don't forget to check the sparkplug boots. They are good looking but they are a constant source of problems on the Yamahas. Replace and make sure they are screwed all the way onto the wires.