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Honzoo Mower

thiggy's Avatar

Join Date: May 2002
Posts: 718

04-24-07, 06:43 PM   #1  
Honzoo Mower

We have at our farm a very old Yazoo mower which has a replacement Honda engine which is itself probably about 20 years old. It quit running recently while my brother was mowing. I tried to start it but couldn’t. I verified it was getting fuel and spark and had a very vigorous compression, so I suspected the timing or valve train. Since it was an OHV, it was easy to pull the valve cover. Upon doing that I discovered that it had a bent exhaust push rod, and I am unable to press the exhaust valve open with my thumb, while I can manually open the intake. I assume something is causing the exhaust valve to stick, but I am not familiar with OHV small single-cylinder engines. My only experience in the past has been rebuilding older flat-heads. I would like to remove the cylinder head. I see 4 bolts which seem to be head bolts, but I do not see any seam where the block and head separates. Are the heads usually removable from the cylinder? I am uncertain of the model number. The following is what I was able to find stamped on the engine case: either QA** or OA** followed by GX140-92363. Can you tell me which of these numbers represent the model ID? I would like to find a service manual or at least an exploded view of this engine. Does anyone have any suggestions? Thanks

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Azis's Avatar
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04-24-07, 07:05 PM   #2  
GX140 will be the key. Keep all numbers handy however.
Honda has some manuals available here
other info as well.

cheese's Avatar
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Join Date: Jul 2001
Posts: 16,567

04-24-07, 08:29 PM   #3  
Yes, the head is removeable. It sounds like the exhaust valve is stuck. Those are excellent engines, and I have never seen a valve stick on one while it was running. Not sure what to tell you to expect.

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