Re: 200 hp johnson 1990
I bought this motor and was told that it ran great last time it was used. I check compression and all was good. When I start the motor it runs a little rough, when I give it some fuel it smoothes out. When I give it full throttle it has good power for a couple sexonds then it will not go over 3500 to 4000 rpms. Every now and then it acts like it wants to run faster then back to 3500 rpms. I am wandering if it is the power pack and how to check it?
You'll like my answer even less.
First get the proper service manual, not clymer or seloc.
www.outboardbooks.com
Its not running on all cylinders,
don't run it like that, especially if you're testing it out of the water on a hose.
No more than 1500rpm unless its in the water.
Do some simple troubleshootin first before getting into component testing.
You need to ascertain whetther its fuel problem or ignition.
Use a $12 adjustable spark gap tester from the auto store,
set the gap to 3/8th inch and see if the spark will jump , with all plugs out , have someone crank it over.
It needs to jump that wide gap, not just a sparkplug gap.
If you have healthy spark in each hole than rebuild the carbs with new carb kits, avail here on iBoats $22 ea, simple DIY job or $800 if you take it to a shop for a V8.
