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#Post#: 75987--------------------------------------------------
Sachs Dolmar 309 fits
By: stretch5881 Date: February 11, 2017, 4:33 pm
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Hi all,
I'm working on a Sachs 309 concrete saw. It was brought to me
because he couldn't start it. Badly scored p&c (60 psi).
So, new cylinder kit installed. Starts and idles but won't rev.
Tore carb down and ultrasonic cleaned and new kit. New fuel line
and filter. No change. Pressure test carb inlet, pops at 12#.
Pressure tested the crankcase and no seal or gasket leakage.
Tank vent is working as it should. I have tore the carburetor
apart at least 6 times in case I missed something (not my first
carb rebuild).
The saw starts and idles as it should, but when you blip the
throttle, it will almost die, then return to idle. If I bring
the rpm up slowly, it will get up to half speed and die like it
ran out of fuel. Also tried 3 new spark plugs. Spark tester
shows spark until dead.
I have run out of ideas.
#Post#: 75990--------------------------------------------------
Re: Sachs Dolmar 309 fits
By: pete Date: February 11, 2017, 10:37 pm
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is the exhaust clear no blocked muffler screen
#Post#: 75991--------------------------------------------------
Re: Sachs Dolmar 309 fits
By: 3000 FPS Date: February 11, 2017, 11:20 pm
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I think you still have a air leak somewhere. If not the crank
seals then start looking at other places like the carb intake.
Or maybe it could be the impulse is blocked or partially
blocked. But sounds more like an air to me.
Also remember the coils on those are rev limited because the
blades are not make for high rpm's.
#Post#: 76007--------------------------------------------------
Re: Sachs Dolmar 309 fits
By: stretch5881 Date: February 12, 2017, 8:33 am
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Crankcase pressure tested ok. I used soapy water to test seals,
intake and base gaskets. No screen in muffler and muffler is
clear.
I think I have a parts saw in the shed. I'll have to see if the
coil is the same and try that.
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