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Honda GXV110 smoking a little #5465655 06/29/20 01:24 PM
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Audioquest Offline OP
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Picked up a 1983 Honda HRS21 mower with the GXV110 engine the other day. Previous owner said it had no compression and wouldn't start. Brought it home - spark plug was not seated properly, so I ran a tap in the threads to clean them, re-seated the spark plug and had lots of compression. The carb was filthy - gave it a good cleaning and the mower started right up. I changed the engine oil with Valvoline conventional 10W30. I think it is burning a little oil - and it gets a little smokey when cutting up hill when the engine is under more strain.

The manual recommends 10W40 for all-round use, with 10W30, straight 30 and 20W50 also shown for various ambient temps. I was thinking of using the 10W30 as a flushing oil and then switching to a heavier oil to see if the smoking lessens. Do you think a heavy weight oil like 20W50 and an additive that helps with engine smoking issues would be too thick? Any ideas would be appreciated.


2011 Toyota RAV4 AWD 2.5
2019 Nissan Rogue SV-Tech AWD
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Re: Honda GXV110 smoking a little [Re: Audioquest] #5465666 06/29/20 01:51 PM
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skyactiv Offline
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it's 37 years old and probably worn out and no special oil routine will help at this point. But oil is cheap and you have little to lose so I'd use PYB and see if it helps. A piston soak might be beneficial, who knows.


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Re: Honda GXV110 smoking a little [Re: Audioquest] #5465668 06/29/20 01:51 PM
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gathermewool Offline
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If it's gunked up and not worn out, it might be worth pulling the plug, pouring in your solvent of choice (I'd go with Berrymen B12), and let it soak on and around the cylinder overnight (longer is better). Just make sure to pull the string without the plug to blow out any residual chem, put a small amount of motor oil in the spark plug hole and then fire her up and let idle for a while. After this, change the oil and see if things have improved.


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Re: Honda GXV110 smoking a little [Re: Audioquest] #5465689 06/29/20 02:12 PM
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nwjones18 Offline
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I bet the smoking gets a little better with some use. Make sure its not over filled and I'd try straight 30 weight in it.


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Re: Honda GXV110 smoking a little [Re: gathermewool] #5465714 06/29/20 02:39 PM
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Originally Posted by gathermewool
, put a small amount of motor oil in the spark plug hole and then fire her up and let idle for a while. After this, change the oil and see if things have improved.



???Why....? If that is really needed.....for a whatsoever reason.....would not be 2T oil a better choice?

I would check also breather element!!! Maybe it is stuck and that engine is not breathing.....


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Re: Honda GXV110 smoking a little [Re: Audioquest] #5466219 06/30/20 09:44 AM
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gathermewool Offline
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Some of my engine manuals say to add a small amount of motor oil through the plug hole prior to storage. I figure a SOLVENT soak would leak past the piston and flush away any residual oil from the cylinder wall. Adding a small amount of ANY lubricant after the solvent soaked, but prior to starting is likely wise and hurts nothing. I just gave one example.

Last edited by gathermewool; 06/30/20 09:45 AM.

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Castrol Magnatec 5W-30 D1G2 + FU filter (2nd OFI) (77,760mi, 3/7/20)
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Re: Honda GXV110 smoking a little [Re: Audioquest] #5467393 07/01/20 07:31 PM
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Mowed the lawn (about a 1 hr job) today. Added about 2 tablespoons of STP stop smoke oil treatment to the VWB 10W30. Also added some Motomaster small engine fuel treatment to the gas tank. Engine runs great with lots of power. When it gets a little workout like a hill or deeper grass, it starts blowing some smoke out of the muffler. Checked the oil level after the job and it seemed normal. One thing I did notice is the oil had turned significantly darker - not sure if that's the STP additive. I think I'm going to do one more grass cutting and then change the oil with 20W50.


2011 Toyota RAV4 AWD 2.5
2019 Nissan Rogue SV-Tech AWD
1991 Honda CRX Si
Re: Honda GXV110 smoking a little [Re: Audioquest] #5467407 07/01/20 07:45 PM
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Merek Offline
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You could try running some Seafoam or MMO in the gas to help clean out the carb, you didn't mention if you cleaned out the tank or not and with the carb. being in poor shape then I would think the tank would need some attention as well.

Re: Honda GXV110 smoking a little [Re: Audioquest] #5467594 07/02/20 05:56 AM
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Linctex Offline
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High exhaust gas temps under load will make oil oily deposits inside the muffler release smoke


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Re: Honda GXV110 smoking a little [Re: Merek] #5467606 07/02/20 06:53 AM
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Originally Posted by Merek
You could try running some Seafoam or MMO in the gas to help clean out the carb, you didn't mention if you cleaned out the tank or not and with the carb. being in poor shape then I would think the tank would need some attention as well.


I was thinking about Seafoam before I put it away for the Fall. And yes, the gas tank was cleaned out.


2011 Toyota RAV4 AWD 2.5
2019 Nissan Rogue SV-Tech AWD
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