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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14988
Experience:  Certified on Onan and Generac generators
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Honda es6500 i have an older honda es6500 generator. it starts

Customer Question

i have an older honda es6500 generator. it starts easy, but will not rev up. if i turn the gas off, just before it runs out of gas the engine revs up. if i put my hand over the intake it is pushing air out not sucking. maybe the exhaust is cloged?
Submitted: 6 years ago.
Category: Small Engine
Expert:  Hank F. replied 6 years ago.

Thank you for choosing Just Answer for the solution to your problem.
My name is XXXXX XXXXX I am going to assist you with this.


What is the serial number of your genset?

How long has it been since this set was run regularly?


Edited by Hank F. on 11/29/2010 at 5:44 PM EST
Customer: replied 6 years ago.
does this look like the serial #EA1-1060171
if not were should i look?
it has been sitting for about 2 years.

Expert:  Hank F. replied 6 years ago.

That is indeed the serial number - thanks!


After sitting for 2 years, I can guarantee you are going to find your problem to be a bad carburetor.

The first thing you need to do is to drain all old gas out of the tank.

Then rebuild the carb.


As gas gets old, it turns to varnish and clogs up the passageways inside the carburetor, not allowing enough gas to get to the engine.

This condition is cumulative. Every time gas sits, the varnish builds up just a little more, like coats of paint, until eventually gas can not flow. It will not happen overnight, but the symptoms can show up over night.


When this happens, either the engine simply will not start, or it will not run without the choke on (this reduces the amount of air getting pulled into the engine, changing the fuel/air mixture), or it will run but surges.


Another issue that varnish in the carb can cause is that the varnish may not allow the float needle to seal properly against the seat, causing the flow of gas to not shut off when the bowl is full. The result will be gas overflowing the carb and running into the cylinder, and possibly out the air intake. If the gas gets into the cylinder, it will seep past the rings and down into the crankcase. This will be evidenced by your oil level being over-full and/or the oil smelling like gas.


The only 2 solutions are to either replace the carburetor or give it a good, thorough cleaning.

Most people believe that cleaning a carb involves removing the bowl and wiping it out, then spraying some carb cleaner through it.

This is simply insufficient.

To properly clean the carb, you must remove it, disassemble it (making sure to remove all non-metal parts), and soak it in a commercial solvent for several hours. Soaking it overnight is even better.

Then clean all solvent off with a spray type carb cleaner, making sure to get lots of cleaner into every hole and passage there is. Pay special attention to the tiny holes in the bore of the carb, under the throttle plate for the carbs that have these holes. Use lots of cleaner. And make sure to wear safety goggles to avoid getting the over spray into your eyes. There will be over spray.

Dry the carb with low pressure compressed air.

When reassembling the carb, make sure to use a carb kit, when one is available for your carb.


Occasionally, even a good cleaning is not going to be sufficient, and you may end up having to replace the carb anyhow. Be prepared for this.


If for some odd reason this does not help, please let me know so I can assist you further.


Hank F. and 2 other Small Engine Specialists are ready to help you
Customer: replied 6 years ago.
carb is clean and still same problem.
Expert:  Hank F. replied 6 years ago.

Try this for me - it will only take a minute.


Remove the air cleaner.

Start the engine.

Spray in some gas or carb cleaner (do not use starting fluid).


Does this make the engine rev up at all? Even for a few seconds?

Edited by Hank F. on 12/1/2010 at 8:38 AM EST
Expert:  Hank F. replied 6 years ago.