07-07-2021, 01:35 PM
Michael,
I have limited experience with Mc flatback carburetors, it was on a chainsaw that I converted to a Mc49 repop. The diaphrams were shot and it behaved like you describe on your Mc-9!
I would check (2) things: 1. Make sure your pulse hole is unobstructed from the manifold all the way down to the reed block. Check by removing the carburetor and using a small wire (straightened paperclip, etc.) to see if there are obstructions. Then make sure the carburetor to manifold gasket pulse hole is onobstructed.
2. Carburetor diaphrams; Make sure they are in good condition; Not stiff or torn and that the diaphram plates are flat (a piece of flat glass works well as a poor man's surface plate!).
I have a Mc-9 on a Bug kart, but switched over to a Tillotson carburetor.
Let us know what you find!
Terry
I have limited experience with Mc flatback carburetors, it was on a chainsaw that I converted to a Mc49 repop. The diaphrams were shot and it behaved like you describe on your Mc-9!
I would check (2) things: 1. Make sure your pulse hole is unobstructed from the manifold all the way down to the reed block. Check by removing the carburetor and using a small wire (straightened paperclip, etc.) to see if there are obstructions. Then make sure the carburetor to manifold gasket pulse hole is onobstructed.
2. Carburetor diaphrams; Make sure they are in good condition; Not stiff or torn and that the diaphram plates are flat (a piece of flat glass works well as a poor man's surface plate!).
I have a Mc-9 on a Bug kart, but switched over to a Tillotson carburetor.
Let us know what you find!
Terry