Yamaha OB running rough

[dcato]

My Yam 225 (carbed and oil inj.) is running rough and almost stalling when in gear from 1200 through 1800 rpms. Once it makes it through this range it smooths out and powers up quickly. It also sputters (skips) at higher rpms occasionally when underway. The powerhead was recently rebuilt and I was running extra oil in the tank for the break-in. Could it be fouled plugs or maybe a carb or fuel pump problem? I have checked filters and lines and all that for leaks and debris. Any help would be appreciated before trying to get a dealer to look at it.<br />Thanks dcato@comcast.net

 

[Solittle]

Re: Yamaha OB running rough

I would suspect a bit of crud in the carbs until the high spped jets open up. That compounded by the increased oil. Might want to wait until the breakin period is behind you and you are back on the normal fuel-oil mix before you do anything.