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Honda GX390


 
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George Marsh
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Joined: 05 Aug 2009
Posts: 6070
Location: terre haute

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PostPosted: Tue Oct 16, 2012 3:40 am    Post subject: Honda GX390 Reply to specific post Reply with quote

I made a mistake and posted this on Tool Talk. I really wanted to post it here. Hope no one gets upset over a double post.

I have a Honda GX390 on a 3700 psi pressure washer. I'm getting hard to start after it's set for a few months and I'm not getting any younger. Once I get it started, it's easy to restart. I crank the water pressure adjust to minimum and pull the trigger on the wand to remover load from pump.
Just wondering if perhaps the valves aren't set right? I've read one place the intakes are .02-.04 and exhausts are .08-.010. Does this sound right?

Also read the engine has auto decompression that operates off the exhaust valve. So if the exhausts are not on the money, could this be why it's hard to start?

Engine has a low oil pressure switch. Is it possible that I don't have enough poop to get the motor turning fast enough to build oil pressure? Once the oil is warm, it's easier to start. Should I try a thinner oil? What grade?

Does anyone have a flywheel with starter teeth and a starter? Love to have electric starter.

Does anyone have other ideas I could try?

Seriously thinking of buying a new pressure washer with electric start.

There are about 4 different pumps on the market. What's your favorite?

George
 
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rrobert
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Joined: 10 Apr 2012
Posts: 323


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PostPosted: Tue Oct 16, 2012 4:50 am    Post subject: Re: Honda GX390 Reply to specific post Reply with quote

Definitely check the valve clearance.

What oil are you using? Could also cause it to be hard to start.

Pulling the trigger on the wand is what I do and works for me.
 
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t.r.k.
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PostPosted: Tue Oct 16, 2012 6:29 pm    Post subject: Re: Honda GX390 Reply to specific post Reply with quote

If you are having trouble spinning it over manually, a starter will have the samd problem.

Check your valve clearance. If the exhaust clearance is really .008-.010, I would set it to the low side.

Also, if you haven't replaced the plugs, it would be a good idea.
 
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George Marsh
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Joined: 05 Aug 2009
Posts: 6070
Location: terre haute

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PostPosted: Wed Oct 17, 2012 3:39 am    Post subject: Re: Honda GX390 Reply to specific post Reply with quote

Thanks guys,
Checked valve clearance, set exhaust to .008. It was at .010. I adjust pressure to zero and no pressure in wand. If there was, it locks up the motor and I would pull the rope out of my hand.

Going to put 10w30 in motor. My problem is I'm getting older. My arm is still hurting 3 days later. Looking for a flywheel and starter or going to give this pressure washer to son and buy one with a starter.

George
 
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