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Old 10-28-2011, 08:42 PM   #1
Torque454
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Default Honda GX340/390 Oil Drain

Hello I have a Honda GX390 and a GX340 both, mounted on a trailer floor and very difficult to remove. I need to change the oil on them but there is no way to remove the drain plug and drain the oil without it draining all over the trailer floor. On my Kohler and ALL my Briggs engines, I can use regular NPT pipe nipples to extend the oil drain out to where I can use it correctly, but on the hondas I believe the oil drains are 10MM. I am not aware of any place atleast around here that sells a 10mm pipe nipple and cap/plug. I have seen some of those quick drain things that extend the oil drain out for these things, but I dont think they are long enough.

What should I do? Or does anyone know where I can buy 10mm pipe?
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Old 10-28-2011, 10:22 PM   #2
RED-85-Z51
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Default Re: Honda GX340/390 Oil Drain

Easiest way is to use a simple hand oil pump. Take off the filler, put the straw in the sump, pump a few times to build vacuum and let it lift the oil, cleanly into the hopper...no mess, no fuss
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Old 10-28-2011, 10:27 PM   #3
kb0nly
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Default Re: Honda GX340/390 Oil Drain

Go to Northern Tool, get the 10mm Drainzit...

http://www.northerntool.com/shop/too...1063_200311063

I put one on my Honda clone on my blower... Makes it nice and mess free.

If its not long enough its a standard automotive grade GoodYear rubber hose, you could easily cut and splice with some barbed fittings and more hose and make it whatever length you want.
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Old 10-29-2011, 12:37 PM   #4
rscurtis
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Default Re: Honda GX340/390 Oil Drain

I used a lot of them on my rental equipment right from brand new. If the oil is easy to change, you'll be more inclined to do it.
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Old 10-29-2011, 03:03 PM   #5
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Default Re: Honda GX340/390 Oil Drain

If the motors are mounted flush to the trailer floor, I dont think you can use a Quick drain type device. Could always put some washers under it though.
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Old 10-29-2011, 05:48 PM   #6
rscurtis
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Default Re: Honda GX340/390 Oil Drain

They were installable on flush-mounted engines without removing the engine. That's one of the things that made them so attractive.
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Old 10-29-2011, 07:19 PM   #7
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Default Re: Honda GX340/390 Oil Drain

Personally I liked em, but I saw alot of blown engines from people not returning them to the closed position securely. And I never saw one on a flush mounted application I could get to to install. It was such a pain when Id short block an engine on a Z mower and forget to swap the drain and have to unbolt the engine, put a jack under the crank to lift it up a hair so I could spin on the ez drain.
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Old 10-30-2011, 01:28 AM   #8
kb0nly
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Default Re: Honda GX340/390 Oil Drain

The Drainzit is not a quick drain with a valve or such... It has a threaded fitting on the end and a cap with an o-ring. I wouldn't put one of those quick drain valve type devices on i don't trust them, but i know some swear by them.

The Drainzit doesn't take any more room than the stock drain plug, so it can go on an engine that is flush mounted onto a surface. Just spin it in like a drain plug, i didn't need to move the engine on my snowblower just pulled the plug, drained the oil, cleaned up the mess, then spun in the Drainzit hose and done. No problemo!
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