Re: Help needed with a '76 seahorse 6 HP
Dennis..... First, check to make sure you have compression and that the reading is even on both cylinders. Should be approx 70 - 80 psi (or higher).<br /><br />Then check the spark (with the s/plugs out). The spark should jump a 1/4" gap with a strong solid constant blue flame.<br /><br />If the above checks out okay, you may have overlooked something in the carburetor, but most likely (from what you've said), it is out of adjustment. Adjustment procedure follows:<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.<br /> <br />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.
