Question about Honda 8 HP Engine

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I have a honda GX240K1 on a BCS tiller. The engine seems to defy reason. I have adjusted the governor, set the max speed screw, adjusted the idle speed and have achieved some success but cannot seem to control max RPM's. The engine max's out at over 5K. I have tried about everything I can imagine yet nothing seems to fix it. Spec's say that it should idle at about 1400 Rpm yet it seems to idle best at about 1800-1900. I am using a EZ328 instrument to check the engine RPM and it's reading is erratic. It seems impossible to get the engine max speed set to what the book says it should be. Max at not over 4,000rpm yet it goes over 5,000- and even approaches 6,000 (according to the EZ328) It's a wireless RPM instrument that senses the spark on the engine plug wire. I am fearful of running the engine for extended periods because I think it will literally blow apart.

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  • linwoodsprou Jun 06, 2010

    The problem is not the instrument, it is the engine. Read the original post.

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Hello. It sounds like the governor is either out of adjustment or in need of replacement. I agree that you should not run this in this condition or you will have a much larger repair to do. I would replace the governor. J.

Posted on Jun 06, 2010

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  • linwoodsprou Jun 06, 2010

    There is one thing that is unclear to me concerning the adjustment of the governor.
    Which of following procedures are correct?

    1. Remove the gas tank (I generally take the bolts out and just let it rest on the engine high enough to make the adjustments)
    2. Loosen the bolt that holds the governor rod to the governor shaft that comes out of the engine.
    (the next steps are what is unclear from the service manual)
    3 Turn the governor shaft clockwise until it stops
    4. Do I push the throttle to 'full throttle" position or set it at the "Idle" position? In other words do I push the control rod for the throttle away from the carburetor or towards it?
    5. Next what direction to I push the governor rod that is attached to the governor shaft that comes out of the engine towards the carburetor or away from it before tightening the bolt.

    The manual is totally unclear in this procedure.

    I had perceived that the governor gear inside of the engine may be the culprit but seriously did not want to break the engine apart for fear of difficulty of re-assembly may well be difficult. I have done many things in the course of my forty plus years as a tradesman - but this is one task that I have minimal experience in. It may not be a big deal, I just don't recall having tread that water before.
    I have worked on far more complex pieces of equipment in my lifetime and yet this little motor seems to defy my life skills. I seriously want to conquer it that I might move on to another quest. I have 9 of these little tractors to rebuild. This is only the second for this year and no two of them are identical. Its the challenge of perfection that I like. :-)



  • linwoodsprou Jun 06, 2010

    click on the below reference to see what the instructions are in the Honda Manual. (I hope this works I've never done it before - set up a link like this one)

    Photobucket

  • linwoodsprou Jun 06, 2010

    nope, guess it did not work.

  • linwoodsprou Jun 07, 2010

    I do believe I have discovered the secret to adjusting the governor. Simply move the throttle to 'full throttle' position loosen the bolt on the governor rod turn it counter clockwise and then begin the process of loosen/tighten and move the shaft until the fine balance of adjustment is accomplished. I must say that those who write the Technical manual for Honda could use a bit of instruction on how to write procedures that are easily understood. I am no novice when it comes to service manuals. I have written many Technical Reference manuals myself and this one is just too brief to be clear. The arrow on the illustration drawing shows turning the shaft in the opposite direction needed to make the proper setup. This is not to mention the other arrows showing movements that are simply not to be done.
    I wish someone at Honda would correct this procedure - it would do a great service for those who repair these engines. I have wasted several days and many hours on the WEB searching for a proper setup of this engine governor. Nothing I found actually worked. The revised illustration that was given to me by reference from the current expert was the nearest thing to a good procedure that I found. Yet it even leaves something to be desired.


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When I first read this post, I was struck by one statement in particular, that, "I am using a EZ328 instrument to check the engine RPM and it's reading is erratic" (sic) Now the thing that I focussed on was the ERRATIC. Having been an engineer now for over 35 year when ever I see or experience anything erratic, I have learnt to CHECK YOUR INSTRUMENT is calibrated and working by checking against a know good. This is a MUST DO. Only then, can we "Trust" our instrumentation. Unless empirical evidence is ALSO to hand, then it does need to be calibrated. Also, with instrument that use WiFi this can have widely variable reading, I have experienced. If everything isn't just so, I feel an OPTICAL trigger is in my experience much more accurate, than anything else. As if there are any problem with the ignition spark etc, that may interfere with the readings. I feel if you have done all you say, and all setting are done and you have set it up by the book, what else is there? Well... It maybe electronic, hence the erratic reading? perhaps the Governor circuitry is not working properly due to a semi faulty sensor? Or perhaps the "Micro" brain, just isn't working 100%, an input may have been spiked etc. http://www.repairmanual.com/catalog/61ZH910 Above is a link for a, pay for, generic repair & service manual I also would get your service manual one too, and they are worth their weight in gold i find. they are just indispensable, they also have troubleshooting steps too, maybe even this is a "know about issue"?
Below is a free service and repair maintenance manual this may help. http://www.scubaengineer.com/pictures/honda/honda_gx_k1_service_manual_240_270_340_390.pdf

Posted on Jun 06, 2010

  • linwoodsprou Jun 06, 2010


    Electronic Specialties (ESI328) EZ Tach Plus

    This device is new. It is the second one I just purchased. I tried the 320 model but learned after purchasing it was only dependable on large automotive style engines. This unit is supposed to work on everything from string trimmers to large automotive style engines. Again,it is brand new. It has (the manufacturer claims) and accuracy of within 10rpm, I am somewhat confident that its reading is correct (even though it is a bit unstable). It is a wireless device that senses the spark on the ignition wire. I am confident that the instability of the reading is caused by not knowing the magical distance from the ignition wire to the spark plug. I can get a fairly good reading what I cannot do is figure out why this engine is running at such a high rpm. :-(



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