Jon E
I'm working on a standby generator  for a friend.  Serial #2048893.  Model #99A03436-S.
It's a four cylinder Mitsubishi that cranks but doesn't start.  He told me that it hasn't been working since he replaced the starter.  I checked compression...all cylinders were good.  It has BP5ES spark plugs....are they the correct plugs?  They spark, but it seems like a weak spark.  My main question is..could the new starter be drawing so much current that there isn't enough spark for the plugs?  Or do we have a bad coil in the distributor?  Any guesses?
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Birken Vogt
Yes to all of the above. Further testing is needed.
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Peddler
My guess is that you are not getting fuel.  Either the Bosch governor isn't opening or the board isn't seeing the crank signal and not opening the fuel solenoid.  My first guess would be the Gov. or the gov. driver.
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MacL
I'm not seeing that serial number or model number anywhere.  Google the model number all I get is your mention of it in this forum.  I'm not sure this is even a Generac unit.
State your problem, not your diagnosis.
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Jon E
Peddler, I believe it's getting fuel.  It runs on propane and you can definitely smell it when cranking it over.  As far as it being a generac....this is a pic of the tag on the outside of the case.
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cookelec
That is a Generac configured unit. Check to see if you are getting 12 VDC to the ignition coil and the fuel solenoid. I believe it is wire #14 to both.
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MacL
Ok it's either very old, or considered an industrial unit.  I'm guessing the control box is on the end, a white front with a voltmeter and ammeter, meter select knob, metal toggle switch to start, and a single red fault lamp.  Try removing the air filter and see if it starts.

If the spark plug holes have beveled sealing surfaces, the plug should be beveled as well and not have a gasket.  I'm guessing that you have 4 plugs on the left side with the exhaust pipe going straight up between 2 and 3.
State your problem, not your diagnosis.
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Jon E
You are correct macl.  Update!  I just got back from my friends place.  As I was scratching my head, looking it over, I noticed the timing adjuster on the side of the distributor was all the way at one end of the slot.  I adjusted it a bit and voila!  Started and ran fine.  Tried fine tuning while running....it purrs like a kitten now.  Funny thing is...he has no idea who monkey'd with the timing before.  Thanks for the help guys!
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