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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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Posted on Jan 02, 2017

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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

  • 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...

Posted on Oct 15, 2009

  • 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

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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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Craftsman lt1000

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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1 Answer

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.

And now for How to adjust those valves:

Jun 26, 2011 | Garden

2 Answers

I've been having problems starting. (Slow turnover) Finally would not crank and assumed it was the battery. Got a new battery and still will not crank, not even spin. Blade switch is off and I checked...

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.

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

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2 Answers

Engine acts like it is vapor locking.. Can Mow 30

heat related problem, probably needs the valves adjusted. When the engine gets hot the valve clearances change

Jul 10, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

2 Answers

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.

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1 Answer

Intek engine runs poorly under load and when warm

if you have a ohv ajust valves and you might have to rebuild carb.

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2 Answers

Craftsman garden tractor stalls after running for about 20 minute

do you have the right fuel filter? some are for pressure and some are for gravity feed, the pressure type (fuel pump) wont flow the gas correctly. another possibility would be the coil.

Jul 07, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Craftsman 20 hp 42 in deck leaks gas into the oil pan.

could put a inline shut off valve in the fuel line and shut it off when you finish or fix it right? .
you need to replace the float the needle valve and seat ( the part that the needle valve pushes against to stop the gas inlet maintained by float level.
You need to find you engine mod# type# code# code is not important
look on overhead valve covers for these #s they are right in line wherever you find the #s if its an overhead valve engine
go to and find briggs logo and click on it and enter your #s or choose from the ones they give and match them with yours and you should be able to find the part numbers you need for this carb.and get them locally or order from them.
maybe this will help cure your issue

Jun 29, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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