Needle valve and seat 1974 Merc 115

[richardlee]

Can I change the needle valve and seat on the lower carb without removing carb from engine? According to one diagram I saw, removing the top of the bowl accesses the needle valve and float. Is this correct. Thanks.

 

[racerone]

Correct.

 

[richardlee]

Thanks, racerone. I paid a mechanic to change the needle valve and seat in the top carb because I had never done it before. In looking around it is something that I think I can do and save some money.

 

[Chris1956]

A lot of those old Mercs had foam floats. These tend to dissolve in today's gasoline-alcohol blended fuel. You might replace all three of them.

 

[richardlee]

Thanks, Chris. I hope to work on it today. I will check the floats. I use alcohol-free 91 octane, but don't know what kind of fuel the previous owner used.

 

[Chris1956]

You will want to use the hard plastic floats, as replacements for the foam ones. Make sure any you find in the carbs are not cracked.