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Old 07-28-2013, 03:12 PM
PatrickGSR94 PatrickGSR94 is offline
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Old Honda mower started fluctuating and then died

I have an old Honda self-propelled mower that is over 20 years old, used every season and has had almost zero problems with it. It's always started on the 2nd if not the 1st pull of the cord, every year, every use.

However suddenly today while I was mowing the engine RPM started fluctuating wildly. It sounded like it was only getting spark (fuel igniting) every 10 engine revolutions or so. It would ignite a few revolutions, and then the engine would start spinning down, then ignite a few more revolutions, etc. It did this for a couple of minutes, and then just died completely.

Fuel is in the tank, and the fuel shutoff is fully open.

I let it sit for about 1/2 hour, then tried again. It seemed to start, RPM all the way up to normal range, but only for a few seconds, then it died again.

The air filter could stand to be cleaned, but I tried starting it with no filter and it just did the same thing, started for a few seconds and then quit. And then on top of that the pull cord spring decided to break after trying it that last time.

The mower is an old Honda SX model, the HR-215. It has 3 self-propel speeds, and also a blade clutch, so there are separate blade control and self propel control handles.
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Old 07-28-2013, 03:25 PM
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Restrorob Restrorob is offline
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Sounds like a piece of trash got sucked up in the main jet restricting fuel flow, Clean the carb and try running again...... After you repair the recoil......
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Old 07-28-2013, 04:17 PM
PatrickGSR94 PatrickGSR94 is offline
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Well I was just now able to get it to start and run, but with the throttle in the Choke position. I started it with my corded drill. With the throttle on the fastest engine run speed, the engine dies. But on Choke it seems to run normally, although the RPM seems a little high.

It does not sound like there's any kind of air intake restriction when the throttle lever is on Choke. When I first started it this morning, Choke was working just like it should (cold engine start, engine runs a little rough, then pull lever back to the fastest engine running RPM speed). But now it's acting like Choke doesn't work properly.

Something out of adjustment with the throttle/choke linkage and cable perhaps?
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Old 07-28-2013, 04:50 PM
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piston slapper piston slapper is offline
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Quote:
Originally Posted by Restrorob View Post
Sounds like a piece of trash got sucked up in the main jet restricting fuel flow, Clean the carb and try running again...... After you repair the recoil......
Ditto...RestroRob....trash in the carb....
Might want to change the sparkplug...if its 20 yrs old...
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Old 07-28-2013, 05:44 PM
PatrickGSR94 PatrickGSR94 is offline
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lol no it's not that old, a little bit of maintenance has been done on it The spark plug and air filter both are about 2 years old I think.

Isn't the purpose of the choke to block off the air and enrich the A/F mix to help get it started when cold? If so then why would it be running smoothly when the throttle lever/cable is on the Choke position?
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Old 07-28-2013, 06:04 PM
herler herler is online now
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You could always put it out of its misery and shoot it.
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Old 07-28-2013, 06:33 PM
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piston slapper piston slapper is offline
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Quote:
Originally Posted by PatrickGSR94 View Post
lol no it's not that old, a little bit of maintenance has been done on it The spark plug and air filter both are about 2 years old I think.

Isn't the purpose of the choke to block off the air and enrich the A/F mix to help get it started when cold? If so then why would it be running smoothly when the throttle lever/cable is on the Choke position?
The reason it is running smoothly on choke is because the main jet is partially clogged.
Choking it increases the vacuum on the carb...sucking more gas....
If the mainjet was unobstructed...and the choke stayed on...you would flood out the engine..
It would stall...
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Old 07-28-2013, 09:28 PM
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BigFish BigFish is offline
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Originally Posted by Restrorob View Post
Clean the carb and try running again......
So what part don't you understand ?????
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