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25. Impulse Signal Present

 Most two-stroke engines have a

passageway between the

crankcase and the fuel pump side of

the carburetor to cause the fuel

pump diaphragm to flex back and

forth with the pressure/vacuum that

is created by the piston moving up

and down

 It is rare that there is no impulse

signal, but always verify that it is

present because no impulse signal

will cause a hard to diagnose,

unusual running behavior that will

appear to be carburetor related

For this blower engine the

impulse signal comes out

through the flange here:

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25. Impulse Signal Present

 For the 1130 saw, remove the white plastic sealing ring, use

the tapered adapter and connect the tester to the impulse port

 By hand, rotate the flywheel back and forth and the needle on

the gauge should bounce back and forth indicating the

impulse signal is present

Stihl MS 18 User Manual

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