Re: 1981 Johnson 90 bogs down after 2500 RPM
I agree with Rick. First thing to check is that you have spark at all the plugs. Assuming you do, check the compression on all the cylinders (if you don't have a compression gauge, you can pick one up at any auto supply place for about $15.).<br /><br />If that all checks out, start looking for an air leak in your fuel system. If your primer bulb goes soft, this is a good indication that air is getting in somewhere. Follow the fuel line from the tank all the way to the fuel pump and make sure all connections are tight.<br /><br />If that all checks out, then you want to start looking at the carbs. You can get carb rebuild kits from any dealer for about $20 (I think) per carb. Really isn't much to the process other than replacing a few gaskets and a needle valve. While you have them apart, use some aerosol carb cleaner to make sure you get rid of any old gummed up gas that might be in some of the passages. I had a similar problem to yours that resulted from a clogged high speed jet in one of my carbs.<br /><br />Above all else, get a manual if you don't already have one. It gives you detailed instructions and diagrams which are worth there weight in gold.<br /><br />Good Luck!
