Re: johnson seahorse 5.5hp, hasn't run in 20+ years
The first thing you will want to do is check compression. The fact is, from sitting for 18 years, there will be some issues. Pull spark plug/s out and spray some fuel/oil mix into cylinders and spin it over a few times. With compression gauge to check condition. Don't be surprised if it appears a little low, 55-60lbs or above. As long as it's above 55lbs, thats all you will need for now. The reason I say this, if to low on compression, you might want to double check yourself for you could be getting into something that will cost some major $$$. If compression is good, go to the next thing witch is checking for spark. With a spark tester bought from local auto-parts store from $6 to $10.00, install it according to instructions, spark should jump 3/8" gap. Don't be surprised if week or none. At this point, the flywheel will have to come off. With flywheel off, look for cracked coil/s, chaffed wires of any kind. If good, I will suggest even if all looks good, get a new set of point/s and new condenser while flywheel is off. If anything is in question, replace with known good parts. Clean turn plate and all wire connections while your at it. Once that is done and parts are installed per spects, reinstall flywheel and just tighten flywheel nut enough to hold. Now check again for spark. If good, torque flywheel nut to spects. If not, remove flywheel and correct issue/s. Once corrected, spray some fuel/oil mix into cylinder and install spark plug and see if it will run, even for a few seconds. If good then this motor should run good after the rest is completed. 1 Can of Berryman's carb and parts cleaner ought to do it. Remove carb/s. Disassemble carb/s completely removing any and all core/welch plugs. Allow carb/s to soak for 24hrs. While carb/s are soaking, the rest is basic maintenance. Remove lower unit and renew impeller and (housing) if needed. You will also need to pressurize lower unit while off in tank to check for any/all leaks. Repair as needed. Once all completed, you should have a great little motor and feel good about bringing this jewel back to life. You will be spending around $100.00 to complete this if your able to preform these tasks yourself. Good luck and post back with any and questions and issues. Welcome to iboats.
