Re: 1975 Johnson 9.9
Mike..... A engine sitting for that length of time will have a clogged fouled carburetor. Make notes, take pictures (unless you have a service manual), then remove, clean, and rebuild the carburetor. Upon reassembly, adjust it as I've indicated below.<br /><br />The reverse thrust kit is usually just that... a kit that really locks the engine down in reverse to eliminate any possibility of having the prop fly to the surface when heavy throttle is applied in reverse. The lock down that exists when in forward will release if you hit a object.<br /><br />However, if that lockdown worries you, simply flip the lock/release lever to the tilt position once the engine is down.... but be aware that if you need reverse suddenly, that engine will have its prop headed for the surface.<br />------------<br />(Carburetor Adjustment - Single S/S Adjustable Needle Valve)<br /><br />Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.<br /><br />Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting. <br /><br />When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
