Author Topic: Husky Special 50 Still not starting  (Read 1052 times)

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Offline KilliansRedLeo

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Re: Husky Special 50 Still not starting
« Reply #10 on: April 25, 2014, 12:22:36 pm »
OK, so now we know that the problem is beyond the tank and fuel delivery from the tank to the carburetor. We will leave the carb internals alone for now since you just put a diaphragm kit in it. The carburetor is essentially a pump, it uses pressure from the spinning engine to pump fuel from the tank and delivers it to the engine.

There is what is called  a pulse tube that connects the engine to the carburetor, in the case of the 50 Special this tube is built into the heat shield (501 77 11-01) it is the rather pointed tube that protrudes from the cylinder side of the heat shield. (See attached picture). There are two rubber parts that connect the heat shield to the cylinder that are notorious for failing. They are ( 503 16 16-02 induction pipe) and ( 503 31 07-51 pulse grommet), there is also a carburetor gasket (501 77 00-02). The pulse grommet for the 50 Special is NLA however I believe that the grommet from a 50 Rancher will also work (505 31 07-51).
 
If the grommet is bad (or missing!) between the cylinder and the heat shield you will not get enough 'pulse' to draw fuel. Like wise if the gasket between the heat shield is not aligned properly with the carb side of the heat shield the pulse will not get to the carb and pull fuel. If you look closely at the engine side of the carb you will see a small hole in the front face of the carb (pulse inlet) this must not be blocked, the gasket also has a small hole that must be situated such that it does not block off the pulse inlet to the carb otherwise no fuel!
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