The Boating Forum - Which carb is on my 1985 Mercury 4.5 HP?
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04-30-2012, 06:26 PM
I have a 1985 Mercury 4.5 HP motor. The thing has given me years of great service. I use it to power my 12' Jon on the local reservoir. The other day I took it out of cold storage and gave it a few pulls. It started up and died out. I pumped the bulb and it did the same thing. I suspect the fuel filter took a dump on me. I got the motor home and took the pump apart and everything LOOKED ok. I took the carb apart as well and other than a small amount of debris it looked fine inside. I figured I would replace the fuel pump and put a carb kit in. I looked up the parts and Mercury lists two different carbs, Tillotson and Walbro. I looked the carb over and couldn't find and markings to tell me which one it is, any clues? ;?
05-02-2012, 04:00 PM
No mercury engine experts on here?
05-02-2012, 04:04 PM
Go to my website send me an E-mail I will send you an E-Mail address to send a photo to then I'll do what I can
05-02-2012, 05:14 PM
Wow I checked the parts diagrams you can't tell them apart ...
05-02-2012, 09:31 PM
To help you identify and repair your carburetor correctly, you will want to find and order mercury service manual part number 90-861361, It'll cover 4 Gnat/90 cc Sailpower &
Goggle the part number for the best price.
05-03-2012, 01:38 PM
I thought the same thing Tommy. I compared the parts side by side and the only difference I could see was the needle and seat. As I can't order the Walbro kit because it is discontinued, I ordered the Tillotson. I hope this will work.