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George

On Tue, 05 May 2009 22:09:49 -0400, wrote:

On Tue, 05 May 2009 16:22:26 -0400, George
wrote:

I have a Stihl FS36 trimmer, which has a Walbro diaphram carb.

It starts OK (after priming), but only runs for 10-15 secs before
rapidly losing power and dying. After it dies, I can restart it (after
pumping the primer bulb), and it does the same again.

IMO, it acts like it's not getting gas. There's no smell or other
evidence of it flooding. But, (a) pumping the primer bulb while it's
dying doesn't seem to help; and (b) when I take the carb apart post
mortem, there's gas in the chamber under the diaphram. Also, when I
operate the needle valve, gas flows up into that chamber. So, the gas
seems to be there.

Any thoughts would be appreciated.

Thanks,
George

(NB: I have removed the spark suppresser screen.)

Jet plugged.

I wondered a little about that. But, during its brief burst of life, it
seems to have full power, and good throttle response. Would you still
think the jet?