Re: O.T. Homelite XL12 question-jdemaris??

Posted by jdemaris on November 10, 2004 at 05:40:16 from (209.23.31.41):

In Reply to: O.T. Homelite XL12 question-jdemaris?? posted by Kevin (FL) on November 09, 2004 at 17:41:51:

It has the same basic carburetor as many other saws, including German ones like Stihl. Tillotson or Walbro, both work the same. If it's flooding, the needle valve is probably leaking. Although the carb uses a vacuum activated diaphram to open and close the fuel needle valve, the valve is the same design as in a float carburetor on a tractor. So, if it gets any dirt in it, or gets worn, it will leak. Directly opposite the needle valve and seat, on the other side of the carburetor, is where the fuel enters and there is supposed to be small screen there. If it's missing, it will allow the needle to foul often. The diaphram on that side of the carb has little flapper valves in it, that serve as a low pressure fuel pump - to draw fuel out of the tank. If you buy a carb. kit it will come with a new screen.
You probably already know, but a 2 cycle chain saw engine needs to have a good cylinder bore throughout, not just good compression on top of the piston. If it does not, the crankase won't charge properly in order to get fuel/air mixture into the combustion chamber. So, along with that the crankcase seals must be tight, the fuel pump must be working (vacuum operated), etc. 2 stroke-cycle has several different designs used for fuel charge delivery. The most common are roto-port, cylinder port, and check valve. Cylinder port engines (like Stihl) are particularly sensitive to scored cylinders. Your Homelite, as I recall, is a reed valve engine - so the reed valve under the carb. must be working properly.

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• Re: O.T. Homelite XL12 question-jdemaris?? Kevin (FL) 10:14:53 11/10/04 (0)

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