1992 Johnson 225hp

[pcmlaw]

I love "old smokey" but have always been troubled by this: it seems to run rough (like on a few cylinders) until mid-range rpms are first achieved, then a "boost" is felt and it runs fine. Ideas?<br /><br />Also I burn about 10 gallons per hour at 4200rpm. Normal?<br /><br />Thanks for any help!

 

[jonjar2]

Re: 1992 Johnson 225hp

I'm not an outboard expert, but it seems to me like a lot of the older motors run rough when idling/low end. I run a 1995 Johnson 225 and its the same way...rough until the RPM's start to get up there. It also burns a lot of gas, but 10GPH is a little high. You may have some old fuel in there, or maybe some water.

 

[ob]

Re: 1992 Johnson 225hp

pcmlaw,What you describe sounds to me like your low speed fixed orifices or porting on one or more carbs may need cleaning.<br /> <br /> Fuel consumption of 10 gallons at 3/4 throttle for one hour sounds acceptable for a 225.<br /><br />Is your engine propped to turn in the upper range of it recommended WOT?If not, on low end ,it is being lugged and may also play a part in your performance issues.Should be capable of 5800 rpm.

 

[jonjar2]

Re: 1992 Johnson 225hp

sorry, ob is right, I didn't see that you were burning 10GPH at 4200.