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Any Honda GX390 Gurus?

Sasquatch912

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Joined
Nov 2, 2016
Messages
362
Location
Georgia
I just bought a belt drive pressure washer with a Honda GX390 on it. The issue i am having is that the throttle wont stay at the high mark. You push the lever up to the rabbit mark and let go and the throttle lever will go back to the turtle. You have to old the throttle lever manually at the rabbit for high RPMs.

What am I missing? All the springs look decent and I already replaced one.
 
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Showkey

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Aug 9, 2014
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8,638
Location
Wausau WI
Throttle lever friction is usually controlled at the lever pivot point.
The nut and washer arrangement control the friction point.
Lever might vary slightly depending on the application.

E905399E-CBB4-4B6E-970A-26ADFAFC6920.jpg
 
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Sasquatch912

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Joined
Nov 2, 2016
Messages
362
Location
Georgia
I tightened it up and it worked.

Now, I just got a new pressure washer hose and tightened up some loose fittings on the pressure washer that made it leak water and now the motor doesn't want to start unless the water is off.

Once I turn the water off then the engine will turn on and run and when I hurry and turn the water on it causes the engine to stall.

And it looks like I need a new pull rope handle too..screwed my hands up to when the handle broke.

The pump is a TS1811 3500 PSI 4.5 GPM.

Is a sticking valve causing this?
 

Fatboy148

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Joined
Feb 15, 2017
Messages
999
Now, I just got a new pressure washer hose and tightened up some loose fittings on the pressure washer that made it leak water and now the motor doesn't want to start unless the water is off.

Once I turn the water off then the engine will turn on and run and when I hurry and turn the water on it causes the engine to stall.


I'm pretty sure you don't want to run the pump without water in the pump.

I also have no idea what others do (or what the directions say) but when I start my washer, I.....

Have the hoses and wand connected to the pressure washer.

Turn the water on at the spigot so you have water at the pump.

Put a water bottle or something else in the grip to hold it open and let water pass through the pump, and through the wand unrestricted, without building up pressure. Let the water run till there is no air coming out of the nozzle, just water.

Sit the wand on the ground next to the pump with the wand aimed in a safe direction.

I put one foot on top of the wand to hold it so when the engine does start, you can control it and the wand doesn't come to life like a snake on the run and try to get loose and spray everything.

Make sure the run switch is on, gas is on and if the engine is cold, the choke is on.

Pull the starting rope.

It's a Honda so if it doesn't start on the first pull, check starting steps. Switch, fuel, choke. If it doesn't start on the second pull, take it to the shop as it's broke. It's a Honda. :)

As soon as the motor starts, I reach down and grab the wand to control it, release the choke when the engine is running well and then take the water bottle out to release the grip after it's been running for a few seconds. Having the grip hold open, allows the engine to get running without having the resistance of the pressure building up in the pump while still having water in the pump so it isn't running dry.

Right or wrong, that's what I do. You could always look and find an operating manual for your particular unit too.
 
Last edited:

giles45shop

Member
Joined
Nov 19, 2018
Messages
13
Location
Odessa, FL
Another way to "help" with starting is to adjust the pressure regulator to minimal pressure before starting the engine. I hook up all the hoses, turn on the water supply, bleed the lines by pulling the trigger until the air is out, make sure the regulator is backed off, choke and start. Once it's running and warmed up then I crank the regulator back up. I have a gauge on mine, so it's easy to dial in.

Mine is a GX390 gear driven to a CAT 45G1 pump (4.5 gpm, 3500 psi), so not really fond of the idea of pinning the handle valve open and trying to keep my foot on it :)
 
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Sasquatch912

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Joined
Nov 2, 2016
Messages
362
Location
Georgia
I think I have a valve stuck is why its doing what it's doing and stalling the engine.

I had some water in the pump but enough to where I could start the motor and then when I ran and turned on the spigot to give it more water then it makes the engine stall.

I got to find the unloaded valve...its not like the direct drive pumps I'm used to.
 
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Sasquatch912

Well-known member
Joined
Nov 2, 2016
Messages
362
Location
Georgia
Found it. You were right..it was at the bottom of this piece. The thing that has the washers on it was very tight. I loosen it up and could hear what I am assuming is the valve.

I seem to can't find this style anywhere on the internet, so I don't know what to do now. Guess I can test it out.
 

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