1996 Johnson 50 hp 2-stroke carbs

[janul15]

Hi, what's the difference between the upper and lower carburettors on the above engine? Is there a way of identifying which one is which when they're taken off the engine? I'm playing with a carb I took off, I am fairly sure it is part no. 435910, and has a number stamped on the body, 339169 D2. I took it from the upper position, but it looks the same as one I've seen for sale which is said to be a lower carb.

 

[racerone]

About the only difference is the linkages on the outside of the carburetors.-----As far as metering the fuel into the airstream they both work the same.-----What is your motor doing / not doing ?

 

[janul15]

The motor wasn't starting, although it was turning over. Spark was present, compression on both cylinders about 150psi. Cleaned both carbs, but on replacing, I found a fractured fuel nipple on the upper carb, which broke completely on examination. Using a bolt extractor, I removed the remainder of the nipple, but the extractor went crazy, and has really chewed up the carb, at the fuel inlet. I am working on it, but may need to buy another carb. Can I use a lower carb, in the upper position?

 

[jimmbo]

A bit of JB Weld might help there. I didn't realize that Extractors could go wild on their own.

 

[janul15]

Got something like JB Weld arriving tomorrow. In truth, it was a bad operator using the extractor that caused the problem. My bad. Now working on a solution.

 

[jimmbo]

If the Linkage Attachment points are removable from the Carbs they yes you should be able to convert a bottom Carb to work at the upper location