Question about Honda Gx390 Motor Inside Cover

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No spark on a honda gx390 motor

When you pull the motor over and it will not fire up and i cleaned the coil and put it back on and gapped it and still no spark

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: Honda gx390 has low power.

Well it sounds like you may need new piston rings or an engine rebuild due to low compression. But a good way to tell if you need an engine rebuild is to test the compression and see if it is up to spec. You can often just feel that the engine is very easy to turn over which is a good sign that you need a rebuild.

Posted on May 08, 2012

Testimonial: "Thanks for the input Mr. Fraser, I am certin it is a compression problem. I didn't think about smelling the engen oil for gas, I will do it tomorrow. Still looking for the compression psi. More or less I think I need to grab a shovel and my metal detector and serch for my coffee can bank. "

  • 1 Answer

SOURCE: How much oil do I

Capacity is 1.16 U.S. quart - The 1st solution provided actually works, but if you are looking for the procedure listed in the Honda GX390 manual here it is: Unscrew oil fill plug and clean it off. Then insert it back into the hole but don't turn it in, just press it up against the front edge. The oil level should be up to the neck of the stem that's inserted. Oil should be present half way up the stick at the very minimum.

Posted on Sep 25, 2013

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1 Answer

Want start. Getting fuel. No fire at spark plug


These engines have a low oil sensor and if the oil is low, the engine will not have fire. So check the oil level first and make sure it is to the full mark.

Check the spark plug that it still has proper gap .028-.031 in and the proper spark plug BPR6ES (NGK) or W20EPR-U (ND). While you have the spark plug out let's see that it is firing, reattach the plug wire to the spark plug and make sure the spark plug is in contact of a bare metal surface for a ground, the crank the engine over watching for spark in the gap of the spark plug. It would be best to check this in a low light area. Keep in mind that checking for spark this way and there is spark but when the spark plug is installed and there is compression the spark may not jump the gap as it should. If no spark with the plug out check the spark plug wire for cuts or tears and it none seen get a new spark plug. If there is spark with the spark plug out reinstall the spark plug. If the engine hasn't been started for some time drain the gas out of the fuel tank and carburetor. There could be water in the fuel also but to check if there is fire get a can of starting fluid. Drain the carburetor anyway at this point because if there is water in the fuel the next step may not fire the engine because of the water. Take the air filter out and give the opening of the carburetor a short spray of starting fluid. Try to start the engine, if it doesn't start or fire with the starting fluid there is something wrong in the ignition system. The Digital CDI Ignition Coil could be bad but before buying a new one you need to check the shear key of the flywheel to the crankshaft to make sure it is in good shape. You will need to remove the flywheel for this. If the key is in very good shape, then it is the coil.

If the engine fires on the starting fluid then you have water in the fuel or the fuel is not getting into the engine as it should from the carburetor. The carburetor needs to be cleaned.

Feb 27, 2015 | 13 HP Electric Start GX390

1 Answer

How to fix a flooded engine.


Remove the spark plug and pull the starter rope several times to clean the cylinder, clean the spark plug and fit it back, try to restart the engine.

Aug 13, 2014 | Honda Gx390 Gx 390 13.0 Used Small Engine...

1 Answer

I put a coil on and didn't leave air gap between coil and flywheel now it won't fire would this ruin the coil


No, you just need to put a gap of .025 between the coil and flywheel and everything should be fine, if the engine won't turn at all, it's not the coil that's the problem

Oct 19, 2013 | Honda Gx390 Motor Inside Cover

1 Answer

What will happen if you don't have air gap between coil and flywheel on a small engine


The "Air Gap" is adjusted to create an electromagnetic "charge" between the magnets of the flywheel and the coil of the ignition system. Without the correct clearance it will not produce the spark necessary to fire the spark plug. When the magnets pass closely to the coil, to make it simpler, it produces this "charge" which is then amplified by the coil that can produce as much as 25-50,000 volts
I don't want to make this sound like rocket science, but the fact is if the coil touches the magnets it will wear out the coil and the magnets and not create the right spark. Too much clearance and it will not produce a spark. I first started working with small engines in the early-to-mid 60s and discovered that by taking a sheet of note-book paper and folding it into about three layers thick, placing it between the magnet and coil loosening the coil so that the magnet would pull the coil to make contact and tightening the coil in place. The clearance would then be satisfactory to make a good spark.
It would then be a simple matter to turn the flywheel to rotate the paper out from between the flywheel and coil.

Oct 19, 2013 | 13 HP Electric Start GX390

1 Answer

My 13.0 honda gx390 motor has no spark and will not start


try disconnecting the black wire which runs across under the fuel tank you should have spark.

Nov 15, 2011 | Simpson Taskmaster Industrial Gas Powered...

1 Answer

Bike not starting at all. sometimes it starts after continous kicks but no use .agian the same problem.


I would suggest that you cleanyour carburetors.
To tell if they need cleaned, spray carb clean in the back of the carb and the kick it over, if it starts right up, then you need to clean your carbs., Drain your gas tank and install a new fuel filter, and put new gas in the tank too.

If it doesn't start right up on the carb cleaner, then check to see if you are getting spark.
If you have spark, then test your compression.
Compression should be at least 125-145 psi but not less than 100 psi to run.

If you don't have spark, pull power wire off coil and see if you have power to the coil.
If you do have power then your coil is bad.
if you don't have power, make sure your on/off switch is working. check wires

As long as you have good compression, good fuel and good spark, that motor will start.

Pull out the plugs and see if they are dry, or wet or , black and sooty.
If dry - no fuel
if wet - no fire or misfire
if black and sooty - clean & check gap or replace with new ones.

Nov 30, 2010 | 2006 Hero Honda Passion Plus

3 Answers

Honda 5.5 hp air comp. no spark wont run


Most honda engines have an oil sensor that prevents the engine from starting if the oil level is low or oil is dirty. Test coil by disconnecting oil sensor wire. With sensor disconnected coil should fire. If still no fire, check kill wire for short. If still no spark, coil may need to be replaced. enjoy

Nov 28, 2008 | Honda Quincy 17 - Gallon Air Compressor...

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