All Carbs are the Same... Kinda

The problem with my reintroduction to Go-Peds was very frustrating. Also, the problem was so simple I couldn't figure it out. I completely overlooked the basics of a carburetor.

IF THE CARBURETOR IS TO BIG (or small), IT DOESN'T WORK RIGHT!

The size of the bore and venturi is vital to the proper operation of an engine!

What happened to me was the fact that I used a Big Bore carburetor on a Small Bore engine. Therefore it would just flood the engine with wayy to much fuel!

The carb that came with my Sport was actually a Walbro WYK-58, which is made to feed engine in the 40cc+ size range. Which I found interesting since the carb came from a 26cc engine.

The engine I have is the Zenoah G23LH. Which is a 23cc engine... almost half the size the WYK-58 is meant to supply. The carb that I needed was a WYJ-138. Soooo... I made a hybrid carburetor. I took bottom of the WYK58 and attached it to the top of a WYJ-239.

As you can see in this picture, the carbs are nearly identical minus the bottom end and the bore/venturi size. The carb on the left is obviously bigger.

Another difference I noticed is that the top end where the throttle linkage is, is reversed. You can tell from the picture here, but these carburetors are laying on opposite sides.

The main problem I had is the inlet and outlet nipples on the WYJ-239 were way to small for the fuel line I am using. I also know that a primer bulb is very useful on an application that frequently has all fuel removed form the system. The scooter the WYJ-239 came from was a BladeZ Moby X with a Tanaka 26cc PureFire engine and it was equipped with an external primer bulb.

Once you take the four (4) screws from the bottom of the carbs off, you will see that the internals are nearly identical. All I needed to do was put the bottom piece with the primer bulb on the top piece with the smaller bore size.

In the picture below... the WYK-58 bottom piece on the left. WYJ-239 bottom piece is on the right.

End result is the picture below. I basically ended up with a Walbro WYJ-138 by attaching a WYK-58 bottom end with a WYJ-239 top end. This ended my month long headache that was due to my inability to figure out why I couldn't star my Go-Ped!

Always remeber, AIR - FUEL - SPARK are the 3 things you need to be in balance for an engine to run!