1979 200 hp johnson runs good then bogs

[deerslayer19652000]

motor runs good at idle at wot it runs good sometimes then bogs and will hit power band ocassionally i have cleaned carbs and blew them out with air changed plugs any sugestions apreciated

 

[JB]

Re: 1979 200 hp johnson runs good then bogs

Howdy, DS.<br /><br />You are probably dropping a cylinder or two (or 3?).<br /><br />This could be a carb getting too little fuel. Low float setting? Could also be a failing fuel pump that can't keep up with consumption.<br /><br />More likely it is an intermittent loss of spark to part of your cyls. Pull the cover and try it without. The cover could be moving a wire where it is able to short to the block intermittently, or it could be allowing an electronic part to warm up to a partial heat failure.<br /><br />Let us know what you find.

 

[deerslayer19652000]

Re: 1979 200 hp johnson runs good then bogs

thanks jb will check that in morning ive been thinking about it motor has 2 power packs probably shutting 1 side of motor down

 

[deerslayer19652000]

Re: 1979 200 hp johnson runs good then bogs

when i had carbs off motor and plugs out turned motor over saw gas mist come out of intake is this because plugs were out not enough compression to close reed valves

 

[JB]

Re: 1979 200 hp johnson runs good then bogs

Howdy, DS.<br /><br />Plugs in or out wont affect crankcase compression. The mist you saw was reed leakage. A little is normal.