Honda gx 390 do-it-yourself engine repair

Manual for minor repairs of engines Honda (Honda) GX120, GX160, GX200, GX240, GX270, GX340, GX390, GX610-690.

If you have the simplest car repair skills, then you can deal with some of the malfunctions in Honda engines yourself. However, if you doubt your skills or simply do not want to bother with your Honda engine repair yourself, we are always ready to help you. We are always ready to make high-quality repair of the Honda engine, using original or tested non-original spare parts.

Always read the owner's manual before operating your Honda engine for the first time.

Always close the fuel cock after work and when transporting.
Never overturn or tilt a Honda engine towards the carburetor and cylinder side.
Do not forget to change the oil in your Honda engine, the frequency of replacement is 100 hours.

Frequent questions related to minor breakdowns of Honda engines, which, if desired, can be eliminated with your own hands.

1. The engine will not start:
Almost all Honda engines have oil level protection in the crankcase. If the oil level is insufficient, the ignition system is blocked and there is no spark. Always check the oil level before starting work.
The next reason for the absence of a "spark" may be a malfunction of the spark plugs, so it is advisable to have them in stock.
If all of the above does not help, there is a "spark" but the spark plug is dry, we climb into the carburetor. During long-term storage of equipment, gasoline decomposes and deposits in the form of plasticine or glue are formed in the carburetor, which clog the main fuel jet. It is necessary to remove the carburetor, disassemble, and rinse all parts well. Particular attention should be paid to the fuel jet.

2. Honda engine emits black smoke and develops insufficient power.
The reason is that the air filter is heavily clogged. Depending on the type of air filter, the paper filter must be replaced with a new one, and the sponge filter can be washed and reused.

3. Gasoline in oil:
The engine starts, runs for a few minutes, then heavy smoke appears from the muffler and the engine stops.
Gasoline enters the oil when the carburetor shut-off needle does not hold the gasoline pressure.
It is possible that dirt has got under the needle in the carburetor and the valve does not hold. During transportation, the fuel cock did not close and the breathing valve in the gas tank cap did not work.

We are always ready to make high-quality repair of the Honda engine, using original or tested non-original spare parts.

The Honda GX 390 engine is the most popular engine for power plants, road construction equipment, for small mechanization machines, generators, water pumps and other industrial equipment. etc. Unrivaled power, economy and durability as well as high reliability with a long service life. Meeting the most stringent environmental requirements today and in the future. Honda GX390 4-stroke gasoline engine with overhead valve (OHV), horizontal shaft, air-cooled, cylinder angled 25 °

TROUBLESHOOTING ENGINE

Difficult to start, there is fuel, but no spark in the spark plug

Check clearance, insulation or replace spark plug.

Clean or replace spark plug.

Short circuit due to poor plug insulation?

Check plug insulation, replace if worn.

Adjust the correct clearance.

Difficult to start, there is fuel and there is a spark in the spark plug

Is the ON / OFF switch defective?

Check switch wires, replace switch.

Faulty starter coil?

Replace the starter coil.

Wrong spark plug gap, contamination?

Adjust the correct gap, clean the contacts.

Is the capacitor insulation worn out or short-circuited?

Is the spark plug wire faulty or short-circuited?

Replace defective spark plug wires.

Difficult to start, there is fuel, there is a spark in the spark plug, compression is normal

Purge the fuel system and fill with the correct fuel.

Is there water or dirt in the fuel system?

Purge the fuel system.

Air filter dirty?

Clean or replace the air filter.

Difficulty starting, fuel present, spark plug present, low compression

Clogged or defective suction / discharge valve?

Worn out piston ring and / or cylinder?

Replace piston rings and / or piston.

Cylinder head and / or spark plug improperly tightened?

Tighten the cylinder head bolts and spark plug correctly.

Is the head gasket and / or spark plug gasket damaged?

Replace the cylinder head seals and spark plugs.

There is no fuel in the carburetor

Fill with the correct type of fuel.

Fuel cock not open correctly?

Apply grease to loosen the fuel cock, replace if necessary.

Replace the fuel filter.

Is the fuel tank hole clogged?

Clean or replace the tank cap.

Power attenuation, compression is correct and action is correct

Air filter dirty?

Clean or replace the air filter.

Incorrect carburetor level?

Check the setting, re-run the carburetor.

Spark plug defective?

Clean or replace spark plug.

Attenuation of power, compression is correct, but the action is not correct

Purge the fuel system and fill with the correct type of fuel.

Clean or replace spark plug.

Is the starter coil defective?

Replace the starter coil.

Incorrect spark plug heat value?

Service center Rem Tech Service offers services for the repair of internal combustion engines Honda GX390

The most commonly used in gardening and construction equipment (lawn mowers, cultivators, walk-behind tractors, gas generators) is the Honda GX390 engine, which we successfully service and repair in our service center.

The experts of our company will eliminate any problems in the Honda GX390 engine, because have a lot of experience.

We invite you to familiarize yourself with the main problems in the Honda GX390 engine

1.Noise of crankshaft bearings

2.The knock of the connecting rod during operation or when changing the load

4. Engine Wedge: (The main cause of wedge or knocking is insufficient quantity)

5.Failure of the mechanical governor

6.Engine smokes under load or idle (CPG wear)

8.Oil leaking crankcase cover or crankshaft oil seals

9.In rare cases - no compression (sticking rings)

10.It starts badly - timely service was not done

11.Does not pull the load that previously pulled

Honda GX390 engines are often brought in, which smoke and consume a large amount of oil. The reason usually lies in improper operation (work without an air filter, work with a very dirty filter, work without maintenance for a large number of motor hours)

Reasons for engine smoke.

With prolonged use of the engine without an air filter, there is an increased wear of the cylindrical group. As a result, the oil scraper rings do not cope with their work and, as a result, oil enters the combustion chamber, and smoke forms during combustion. In this case, you will need to replace the rings.

Putting new rings on a worn out cylinder - it is possible to remove the breakage for a while, but this will not solve the problem as a whole.

For the global elimination of the breakdown, it will be necessary to replace the engine block and rings and, if necessary, the piston group.

Without skills, it is better not to try to conduct engine repair Honda GX390 do it yourself, since not qualified intervention will only aggravate the situation and increase the cost of repairs several times.

Contact the specialists in our person, save your money, time and nerves.

If the breakdown does not require spare parts that we deliver to the client, then the repair is carried out as soon as possible. The cost and terms are announced to the client immediately after a thorough diagnostics of the equipment. And the decision on the appropriateness of the repair is always yours. If the customer refuses to further repair, only diagnostics are paid. Also in our service center we offer you a new service for the exchange of old equipment, the repair of which can sometimes take 80% of its cost for a new one. Check the details with our managers at the indicated phone numbers.

Turning to RemTechService, be sure that your equipment is in the reliable and skillful hands of our specialists.

Repair of the Honda GX390 engine is required, call: 063 202-90-70 097 023-42-42

Is the honda gx engine out of order on a row cutter, cultivator or other equipment? Our qualified specialists are ready to go to your site and repair your engine right on the spot. We have all professional tools and equipment for diagnostics and repair of GX series engines in stock.

Since the engines of the GX series are so reliable that if they fail, then most likely a major overhaul is required, we will take with us all the necessary spare parts to repair any malfunction and, of course, all consumables for maintenance.

Do you need a new original honda gx series engine? You can always buy it from us with a discount and additional bonuses in the form of free delivery and installation on your equipment. If you are looking for just such a motor, then you already know about all the advantages of these motors. Find out more about the characteristics of each model in the products. For regular customers cumulative discounts and gifts!

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Buy original honda GX120 from us and you will not regret your choice. Favorable price and engine replacement as a gift.

By purchasing an original honda GX200 on our website, you get an engine installation or replacement as a gift.

Buy a honda gx690 engine. As a gift you will receive a discount, delivery, installation of a new engine and diagnostics of an old engine.

Buy original honda gx660 from us. Discounts for new and regular customers. Delivery and installation as a gift.

Are you looking for a two-cylinder honda gx630? You can buy it from us with a discount and free installation. Delivery within MO as a gift.

Buy a honda GX390 engine with installation as a gift. We stock original motors with discount and free shipping.

If you want the original GX340 engine, you can buy it from us with discount, free installation and shipping. Motor and spare parts available.

Discount original honda gx270 buy from us. As a gift you receive delivery and installation of the engine.

Do you need the original GX 240 motor? Buy it from us and you will receive a discount and additional bonuses.

Buy a honda GX160 engine. Installation and replacement of the engine as a gift. Discounts for regular customers.

If you need spare parts from honda GX or another engine from this manufacturer. You can always buy and order any part from us at reasonable prices and accelerated terms! Delivery of any spare part or even installation in our service will be as fast and professional as possible. Written guarantees are included.

We are the official dealer of honda engines for power equipment. We do both warranty and post-warranty repairs, we provide a manufacturer's warranty and our own extended warranty for the work done and the engines sold.

Our company provides a guarantee for new engines and work done.

• manufacturer's warranty for new honda GX engines - 24 months,
• extended warranty for new engines - 37 months,
• repair warranty - 12 months.

Payment for new engines is made upon receipt or with partial prepayment.

Payment for repair of honda gx engines is made upon delivery of the work to the customer.Engine diagnostics are free of charge, in case of consent to repair. Diagnostics without repair costs 500 rubles.

Payment for spare parts is made upon receipt, if available.

For spare parts on order (when not available), full prepayment is made. Delivery time for spare parts approx. 30 days

New honda gx engines are delivered directly to the customer's site, where the old engine is replaced with a new one on site. Engine replacement is free of charge.

Repair and maintenance of honda gx engines is carried out directly at the customer's site, all spare parts that may be needed for repair are brought to the place of repair, or if the required spare part is not available, the spare part is ordered and the repair is postponed until the part is available.

Delivery of spare parts is made in any way convenient for the customer.

Our company works only with reliable and trusted companies, suppliers and official distributors.

Anna: in our village at least once a week, but still they will turn off the electricity for half a day. You can wash and watch a movie, if, of course, the generator, which had previously saved us in such situations, had not broken down. We have it broke in the midst of a holiday in the country, it happened when we again had power outages.

Sergey: I found these guys on the Internet, I think I was lucky. They came directly to my summer cottage, made diagnostics on the spot and immediately proceeded to repair, since they brought all the necessary spare parts with them. After a couple of hours, my generator started to work like new again, and in fact it is so necessary because of frequent power outages in our area. I can't even imagine how much time and nerves I saved thanks to these guys. Thank you very much!

gas generator engine repair
_{New Moscow}

On the eve of fishing, while packing, I started the engine and noticed that my towing vehicle stopped working smoothly, but in fact it stopped pulling altogether. I found this site, called the wizard for diagnostics. It turned out that over the years of service, the entire piston group had worn out, the cylinder had worn out and, in addition, the clutch in the gearbox had worn out. The costs of spare parts and repairs were not small, but the master suggested an ingenious solution to the problem: instead of repairing an old engine or buying a new one with a gearbox (it was expensive), it was cheaper to buy and install a new engine without a gearbox and replace the clutch in the old gearbox. The cost of solving the problem turned out to be acceptable, and how surprised I was when everything was done the next day, especially since I actually got a new engine! The fishing took place only thanks to these guys.

Replacing the engine on Ryde's tug
_MO

We urgently had to finish and hand over the work to the customer, when, as luck would have it, the engine on our show cutter went out of order. The work has stopped, the deadlines are on the verge of failure. The boss quickly found his way and found this site in a Yandex search. The master arrived 2 hours later, made diagnostics right on the spot. It turned out that the carburetor was clogged because of this, the engine did not start, plus, apparently, this engine had never been MOT. We didn’t have to carry a heavy shot cutter to the workshop and waste time, it turns out that oil and fuel can be drained right on the spot. After quickly cleaning the carburetor and installing new air and fuel filters, as well as changing the oil, the engine began to start and work like a new one, as a result, we finished work in the evening and handed over the object. Thanks to your company for its prompt work and professionalism.

repair of the engine on a show cutter
_Moscow

,, Cross-eyed reptile ,, HONDA GX390 installed on the generator. During operation, a flame escaped from the muffler. I muffled, checked the valves, everything was normal. When I tried to start, I broke the starter rope, then another one.When I changed the rope for the third time, I realized that the engine was helping me to tear it. I pull on myself, and at a certain moment he pulls on himself. Early ignition? Tell me who came across. Thank you.

You shouldn't be so on Honda.) I see two options - a large amount of burnt oil in the combustion chamber or a problem with the decompressor, which is installed on the camshaft. In the first case, you can try to fill in decarbonization.

The valve is normal, how is it? Is there a cap on the outlet valve? The amount of clearance? If the clearance on the exhaust valve is much larger than it should be, then the decompressor will also not be able to perform its function.

Well, I called HONDA loving, I will measure the gaps but I think it is normal. But the decompressor, it’s interesting, I didn’t know about it, well, I didn’t come across such a technique earlier, how to check it. Could the flame from the glushak go from the decompressor?

The flame could be as a result of an enriched mixture (for example, the gene worked with a covered air damper of the carburetor), in this case it is very possible that deposits were washed away from the piston bottom and combustion chamber and the compression increased sharply.
And to get to the decompressor, you need to remove the generator set ... with all the ensuing consequences

As the piston approaches TDC in the compression stroke, the decompressor slightly raises the exhaust valve, decreases the compression and makes it easier to start the internal combustion engine

Volt wrote:
The valve is normal, how is it? Is there a cap on the outlet valve? The amount of clearance? If the clearance on the exhaust valve is much larger than it should be, then the decompressor will also not be able to perform its function

Thank you dear Volt. The problem has been solved thanks to you. Gap on release is gone, two times gone,
made 0.2mm and the motor started singing.

alexv40in, not at all

.. by the way, the gap increases at the exhaust, and decreases at the inlet. Therefore, it is necessary to adjust the clearances according to the terms indicated in the service book, on time! From increased clearances, even at Honda (I am silent about the Chinese), there are frequent cases of valve breakage, which can lead to the loss of the engine

tell me where you can read about the carburetor device used on this engine

Volt Can you tell me how gasoline gets into the crankcase.

Always close the fuel cock (located either on the tank or on the carburetor), however, the fuel cock can also leak fuel when closed.
And fuel gets into the crankcase so - when the tap is open or flowing through, the fuel from the tank located above the carburetor constantly communicates with the float chamber by gravity. The needle valve of the fuel level in the float chamber allows this level to rise. This can occur over different periods of time ... minutes / hour / day / month / year. Then the fuel flows into the diffuser, some of it pours out, and the other part enters the intake channel ... and then everything is simple - through the intake valve, through the gaps - the piston / piston rings / cylinder and finally the crankcase.
And in the instructions it is strongly recommended to check the oil level before each start of the internal combustion engine.
Also, the oil should not smell like fresh gasoline.

Volt Thanks for the answers.
The situation is this: I checked the oil level, started it up, after about 10 minutes it somehow started to work unstably, drowned it out, checked the level, and there it also flowed over the edge with gasoline.

Hi all!
Thanks in advance, can anyone tell me)
Generator with GX-390 engine
With remote start.
There was a problem with fuel leaking into the crankcase, they decided with a solenoid valve.
About two months ago, the starter burned out, replaced with the original 600 already, (if anyone is interested)
I waited a month and a half for delivery and the generator did not work,
after installation the following problem arose:
for some idle time of 6 hours or more, all the fuel in the cylinder dries up, when the engine starts, it does not enter the cylinder, (the spark plug is dry),
I start by injecting a small amount of fuel into the spark plug hole,
I think there is a problem with the carburetor, (I parsed it twice,
once the throttle valve is jammed, the second time it is sucked in,)
there are two adjusting screws on the caburetor, one is idle, the other I don’t know!
MAYBE WHO KNOWS WHAT THE SECOND SCREW IS FOR?
metal slotted, with spring

mrballl wrote:
There was a problem with fuel leaking into the crankcase, they decided with a solenoid valve.

if it is a valve that is screwed on the bottom of the carburetor, then it has no effect on "heat".
This valve turns on for a short time (blocking the opening to the main jet) at the moment the generator is turned off (residual voltage from the generator is supplied through the closed contact of the ignition switch). This is necessary so that there is no cotton of the burning out mixture in the muffler.
If you repaired this valve, then it is quite possible that the engine does not start because of it.
But something hurts a lot you found faults in the Keihin carburetor (and this is exactly what should be on the Honda)

It's easier for us in Kazakhstan ... for 600 batteries you can buy at least six Chinese starters that will work no worse than Japanese

With the twisting of the candle more carefully .. I can imagine how much the head will cost

Great job! Change the motor, who thinks and you will be happy! We put on our slanzi dva! Horses are power

Well done! Like, go to my channel

Hello, tell me, can you share the drawings of the adapter plate? I want to repeat your odek feat. Ru

Honda gx hp clone engine instal process on htz t mini tractor

Great job, stove and flywheel from beats?

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Honda gx hp clone engine instal process on htz t mini tractor

Dismantling, cleaning and adjusting the carburetor of the Honda GX engine

disassembly, cleaning, adjustment of the carburetor Honda GX120 GX140 GX160 GX200 GX270 GX340 GX390