140 mercruiser problems

[bishop12]

Hello, I have a 1980 dixie boat with a 140 I/O <br />mercruiser engine. The boat continues to carbon foul the spark plugs. I recently rebuilt the carb (not sure if it is even the carb for the boat) it is a rochester 2 jet.Can anyone tell me the correct jet size for this engine. I also found that the alternator was not charging and changed it out with one off of an s10 truck and it charges but it seems to get a little hot. Was this a bad idea?

 

[DJ]

Re: 140 mercruiser problems

bishop,<br /><br />NEVER use an automotive part on a I/O. Marine alternators and starters are sealed to prevent sparks. Gas fumes and sparks in a closed engine compartment are not a good combination.<br /><br />Is your choke opening all the way?

 

[bishop12]

Re: 140 mercruiser problems

I see now about the alternator, guess I need to read a little more. Yep the choke is open all the way I have toyed with the air fuel mixture a little and cant get any changes. Thanks for the fast reply.

 

[bishop12]

Re: 140 mercruiser problems

Do you know what size the jets in the carb should be,or if this is even my problem.

 

[bishop12]

Re: 140 mercruiser problems

Does any one know.

 

[Dean173]

Re: 140 mercruiser problems

I'm not sure if jet size varies with carb type, but I just rebuilt mine and checked the listings online to make sure.<br /><br />I have the Mercarb on mine, and the specified jet size is 145 unless you are operating at high elevations (up in the mountains, I guess).<br /><br />A little creative searching of carb rebuild parts online will probably yield the absolutely correct answer.

 

[bishop12]

Re: 140 mercruiser problems

Can any one help me!!!

 

[Trent]

Re: 140 mercruiser problems

If you want a specific answer? Need serial number of carb and engine. Also are your using oil? Other problems that might help. As in...Stumbling on take off? Idles bad?<br /><br />Why do you want to change the jets???? Did you do a compression check?? Need info

 

[Seaboo2]

Re: 140 mercruiser problems

I checked the specs in my repair manual and they list the jets for the mercarb, but under rochester the jet space is blank. I sugest sharching online (OldSeville's idea).

 

[bishop12]

Re: 140 mercruiser problems

Never had it in the water. But when I run it with the muffs it doesnt stumble.I also did a compression check and got 150lbs per cyl. I have adjusted the float level several times and still get the dripping.