Question about Craftsman 4 Cycle Blower/Vac

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Leave blower and vac

Will not start. Has spark but will not fire. You can spray starting fluid in
spark plug hole or in the intake of of the cab. Still no fire.

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  • Gary R Waniolek Sep 25, 2008

    I have a craftsmen 205 hp leaf blower that will not start. Please help


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I don't mean to over simplify this, but are you using fresh gas? Gas blowers and string trimmers are extremely ticky when it comes to gas. They like it SUPER fresh. Not just fresh from the can, but fresh from the pump! And while the gas and oil mixture should be right, it can be off a little bit and still run. Try draining all of the gas out, and then filling up with fresh mix. This is ALWAYS my first step with string trimmers and blowers, and it fixes the problem 75% of the time. Also make sure your spark plug is clean. If you are not sure, a new plug couldn't hurt.
Hope this helps!!


Posted on Oct 08, 2008

  • Alby Thorp Apr 10, 2012

    Also, try to use high octane 100% gas. Ethanol will eat up rubber O-rings, etc. . . over a period of time. You should see an immediate difference in how it runs. Try to drain the gas out of the tank if not used for more than a week, as it will tend to gum up the carb from sitting, especially if left in the heat.


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Use carburetor spray from now on, starter fluid does damage.

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If you pull too manyoung times, it could be flooded.

Wait a little, now remove the exhaust, spray carb cleaner into the exhaust port and plug hole... give 2 slow pulls, just enough to make the cyclinder go up and down a few times, then give a normal pull...

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have you checked the muffler and ex port for carbon / blockage?

have you checked the timming key ?

does the unit have enough compression ? by enough i mean 100 psi or above is considered
the btm limit

does the machine fire on 2 stroke mix , if you pour some in plug hole ?

will it fire again if you spray into carb throat with the carb on ?

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place piston @ bdc and pressurize to 7 -8 psi check around areas as above of leaks with soapy water , you will see bubbles where a leak is , but the pressure remains constant for at least 2 minutes thats good , the use a vaccuum tester and apply 20 - 30 inches vaccuum to c/cases
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a 2 stroke will exhibit symptoms such as ,revs out far too much ( lean ) overspeed -
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2 strokes need air tight cases to create vacuum and pressure pulses to pump mixture to cylinder and to operate the carb fuel pump diaphrams

remember this F A C T S

F = Fuel

A = Air

C = Compression

T = Timming

S = Spark

cheers pauly 46
hope it helps

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1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
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Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
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Remove Carburetor
6) replace gaskets/diaphragms
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b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
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Hi gr2954;

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