good morning- i have 2 posts running right now- one talks of my problems with dolphinite bottom paint, the other my johnson 150hp. the biggest problem is loss of power- down to 4000 rpms and 31mph.<br /><br />got another opinion last night- although my engine has some issues (lower compression on one cylinder and a check engine alarm that randomly sounds), that it may not be the real problem. since my bottom paint didn't work, i put it up on a lift and spend 8 hrs power washing it. i knocked off the scum and barnacles. but the "feet" of the barnacles still remain. no big build-up, but my hull is far from smooth. would probably cut my hand if i rubbed it along the underside.<br /><br />the new opinion is that this is most definately dropping the power by what i'm experiencing. alothough i can't accurately describe how smooth/rough my hull is, does anyone agree here? how much will a rough hull cut on your rpms/speed? will it affect rpms, or just speed?<br /><br />i plan on pulling the boat and sanding the hull back to a smooth finish, eliminating that problem all together. but wanted to get opinions. i'm optimistic that my engine may not be so bad...
<br /><br />That decarb is for removing carbon buildup in the cylinders- won't help at all for aged fuel.<br /><br />Try draining tank of old fuel, refilling half way with fresh gas, pour a couple of cans of carb cleaner into the tank, then run it HARD using up the partial tankfull. Bet you get your RPM's back! 