idahoguy said:
I have a 1990 15 horse Johnson outboard. I got it from a friend who didn't run it for a few years. I am having some issues with the water pump and the carb I think. I replaced the water pump, and tested it. When I got it started, at a low idle the water indicator would almost spray, instead of shooting a solid stream. Then when I increase the RPMs it shoots a solid stream. I let it idle for awhile, but it will die if I let go of the handle.
The last time I got it started, It wasn't shooting ANY water out, so I killed it. What am I doing wrong? And do I need to get the carb worked on? I am positive that there isn't any blockage in the line, and I have followed all the links on this site and I am unsure where to go now.
Seth-
Hope these help you out. You will have to login at site to see the pictures(its free)
https://forums.iboats.com/showthread.php?t=309188 (waterpump)
https://forums.iboats.com/showthread.php?t=244013 (carb cleaning and overhaul)
https://forums.iboats.com/showthread.php?t=167352 (carburetor adjustments)
https://www.sschapterpsa.com/ramblings/OMC/OMC%20info.htm (excellent link for your motor)
Please get a manual, believe me it worth the 30bucks and you have an excellent resource with specs and diagrams.
https://www.outboardbooks.com/
https://shop.ebay.com/merchant/searay...dkw=&_osacat=0
Oh by the way, I would put a fresh set of spark plugs on that motor even the ones on look ok. Make sure the vent valve on the tank is open during operation. Always use a fresh gas oil mix, even if the gas is about less than couple of months. You can put the old gas in the lawn mower it won't care :lol:
I believe a carburetor cleaning is due. Don't let the carb cleaner touch any of the plastic piece, it will destroy them.
The iboats links have alot of good information on water pump/impeller changing and lower unit gear oil change.
Gear oil should be replaced each season with marine grade gear oil
video on water pump change
https://www.youtube.com/watch?v=Fj1c4oYpHAw&feature=PlayList&p=927682907A9BA566&playnext_from=PL&index=0&playnext=1
Carb cleaning and rebuild....general idea
https://www.youtube.com/watch?v=o5cxBMDezuU&feature=related
Gear oil change...good idea
https://www.youtube.com/watch?v=Wj0la6c5FDg
Good luck my friend!!
cajuncook1
