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Have a Craftsman Portable Generator, model #580.326720 w/ a 6.5 hp engine and overhead valve. Starts right up and sounds great, but after 10 minutes engine starts to shot flames out the exhaust with a small boom noise. I have drained the gas tank, added fresh and cleaned the carburator. Could the valve be sticking?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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ROMOAS
  • 97 Answers

SOURCE: Hi,I have a craftsman generator

check the oil in the engine if it is at the correct level then the low oil sensor could be dad causing the engine to shut down you can disconnect the wire from the sensor for this should be just 1 wire make sure the wire don't ground out this is how they work when low oil the switch grounds and kills the engine for safety .
you can use a ohm meter to test the terminal against the block if theirs a reading then it is bad and needs replacement you can run the engine with out it connected but will need to check the oil often hope this helps

Posted on Sep 01, 2010

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sal_kh_sab
  • 98 Answers

SOURCE: where is carburator on Coleman portable generator «powermate 3750

send me a picture of the engine from the (pulling handle side)...and i will help you...
P.S. you will receive my reply immediately...
sal_kh_sab@yahoo.com

Posted on Oct 15, 2009

dmftrucker
  • 1922 Answers

SOURCE: Engine starts and runs fine for about a minute

try to clean out the carb first with auto parts carb cleaner, then you may need to buy a totally new carb for the unit, as this company will NOT sell parts for these carbs due to the carb setting is sealed & has to stay at a set level for voltage output and setting

Posted on Nov 05, 2009

  • 151 Answers

SOURCE: Tecumseh model 100 engine 10hp on a coleman

check the fuel mixture settings i believe main screw is 1 3/4 turns from closed and the idle screw is set at 1 1/4 turns from closed. These settings are for non OHV models. also check that if you have a fuel filter installed that it is not plugged up.

Posted on Dec 24, 2009

  • 2 Answers

SOURCE: Coleman Powermate 10 HP Generator shuts down after a few minutes.

I have an HM100 on a 5500 watt gen with the same problem. This motor calls for a J17 spark plug, but I found using a J19 (hotter) plug solved the problem. I think the J17 doesn't get hot enough for a complete combustion burn so it act like fuel starvation thus resulting in the black sooty and wet plug.

Posted on May 18, 2010

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If it has overhead valves, get the specs from the engine manufacturer and reset the valves. this should cure the problem.

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Have a craftsman gt 5000 with a briggs 22 hp ohv els725 engine. the engine starts hard, then seems to act like its going to die, then i can partially choke it and it seems fine. then when its put under...


It could well be in the valves. The valves are adjustable on this engine and affect the operation of the built-in compression release. The release greatly aids in easier startup. Adjusting these overhead valves is part of the maintenance required for these engines. They don't have hydraulic valve lifters, so adjustment is required. Go to this page, scroll down to the bottom of it and find 'Adjusting Overhead Valves." There will be instructions and you can click on actual photos of the procedure to follow. I will also give you a Briggs engine chart (you supply the model no.) so you can determine what the valve lash will be for your paticular engine. Here they are, with the chart first, the directions on how to adjust your valves afterwards.
Find your engine in the OHV lists.

http://www.briggsandstratton.com/engines/support/frequently-asked-questions/~/media/71BB9DA0BD4D4C19A0DA611923A0B80A.ashx

And now for How to adjust those valves:

http://www.briggsandstratton.com/engines/support/frequently-asked-questions/Servicing%20the%20valves/


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A fuse would not prevent the engine from spinning, good or bad. What would prevent it though, is a compression build-up inside the cylinder(s) of the engine. These engines have overhead valves.These engines also have a built-in compression release feature that is activated at low (when starting) engine speed and cancels when the engine starts running. It works off of the camshaft and allows the intake valve to open ever so slightly on the compression stroke so as not to overburden the starter. Remove the valve cover(s) and adjust those overhead valves. It is not hard. Here is how it is done.

http://www.briggsandstratton.com/engines/support/frequently-asked-questions/Servicing%20the%20valves/

Read the section (pictures are included) that says "Adjusting Overhead Valves".

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I have an HM100 on a 5500 watt gen with the same problem. This motor calls for a J17 spark plug, but I found using a J19 (hotter) plug solved the problem. I think the J17 doesn't get hot enough for a complete combustion burn so it act like fuel starvation thus resulting in the black sooty and wet plug.

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