carb not sucking up fuel

[flatyre]

hey folks have an old 1106 contra which runs no problem when I pour fuel down the bore, but even after checking the fuel filter and carb, it just won't draw fuel up the pipe. its an old Tillotson carb, pretty simple and robust compared to a modern carb, took it apart, and the diaphragm and rubbers looked ok, anyone have any knowledge of these older carbs?

[spudulike]

hey folks have an old 1106 contra which runs no problem when I pour fuel down the bore, but even after checking the fuel filter and carb, it just won't draw fuel up the pipe. its an old Tillotson carb, pretty simple and robust compared to a modern carb, took it apart, and the diaphragm and rubbers looked ok, anyone have any knowledge of these older carbs?

 

A carb is a carb TBH. The carb pulls fuel from the tank using the pump diaphragm which is the brown thin diaphragm and not the black one.

The carb is a Tillotson HL and at one time or the other an extra pump stack was fitted on the carb on some saws to pull fuel from the tank more efficiently.

 

Try cleaning the carb down, trying to start the saw and then strip the carb again and see where the fuel has got to and this will indicate what is going on.

 

One place to take a look at is the filter under the small single screw cover on the lower bowl, this may be blocked and was sintered metal on the older saws. Some of these carbs had a screw that you can remove and crank the saw to see how many pulls would pull fuel through but don't know if this was one of them.

 

Here is mine - you can see the screw on the top of the carb!