90hp Johnson rough idle

[Clint37]

I have a 2000 90hp Johnson V4 that I bought used a few months ago. In the past (on other OB engines), I have disconnected the fuel line from the engine and let the engine run itself out of gas before trailering. With this Johnson 90hp, the fuel lines run into a rubber boot before going into the engine making it difficult to disconnect so I just leave it connected. I crank it with the water ears on about once a week. Is this as good as disconnecting the fuel line from the engine? Also, how do you know when it needs to be decarbonized and what is the best method for doing this? Thank you!!!!

 

[Clint37]

Re: 90hp Johnson rough idle

I forgot to mention that it seems to idle rough and is sometimes tough to crank after sitting for a week or so, hence the question about decarbonizing. Thanks

 

[The Marine Doctor]

Re: 90hp Johnson rough idle

Do not disconnect the fuel line of your engine. You will pump your carbs full of oil. Or do damage to the VRO.<br /><br />Some guys decarb once a year...others do it less often. If you are using a good quality oil...the decarb process should be longer inbetween. If needed at all.<br /><br />TMD