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Unread 03-06-2012, 08:08 AM   #1
Not Yet Wild
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Default Honda GX340

Does anyone know what the valve adjustment is for honda gx340 engine?
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Unread 03-06-2012, 11:44 PM   #2
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Default Re: Honda GX340

valve lash? i set my lash at .003 intake and .004 exhaust.( thats what spec was for my gx200 clone so i went with it) i figured that was enough lash without giving up lift

edit: mine was gx"420" but its basically the same as 340
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Unread 03-06-2012, 11:51 PM   #3
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Default Re: Honda GX340

.006in on the intake and .008in on the exhaust same as gx390.

.15mm and .20mm respectively.
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Unread 03-10-2012, 11:57 AM   #4
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Default Re: Honda GX340

Lot of the kart guys run very low or no lash, they say they open up when hot. It does vary how the comp release works looks like my 420 the release is on the exhaust. I had to make the lash larger on the other one I did so it would idle really slow without comp release kicking in. It still releases to start, I set the idle just above the release. I think my clone manual for a 420 says .15 and .20mm like Fstg21 posted. I'll look in a minute and post if not. The 420 and 390 are the same far as I know, just 2mm bore and stroke increase on the 420...the 340 is the smallest using that block but I was told the head chamber is smaller on that iirc Hookm used that head to raise compression on a 390 or 420.
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